Octopus

Soft-bodied eight-limbed order of molluscs

This article is about the order of cephalopod. For other uses, see Octopus (disambiguation).

Octopus

Temporal range: Middle Jurassic – recent

PreꞒ

Common octopus
(Octopus vulgaris)
Scientific classification
Domain:  | Eukaryota
Kingdom:  | Animalia
Phylum:  | Mollusca
Class:  | Cephalopoda
(unranked):  | Neocoleoidea
Clade:  | Vampyropoda
Superorder:  | Octopodiformes
Order:  | Octopoda
Leach, 1818[1]
Suborders

(traditional)

* Cirrina
* Incirrina

See § Evolution for families

Synonyms

* Octopoida
Leach, 1817[2]

An octopus (pl.: octopuses or octopodes[a]) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ɒkˈtɒpədə/, ok-TOP-ə-də[3]). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a beaked mouth at the centre point of the eight limbs.[b] The soft body can radically alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.

Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived. In most species, the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes senescent and dies, while the female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Strategies to defend themselves against predators include the expulsion of ink, the use of camouflage and threat displays, the ability to jet quickly through the water and hide, and even deceit. All octopuses are venomous, but only the blue-ringed octopuses are known to be deadly to humans.

Octopuses appear in mythology as sea monsters like the kraken of Norway and the Akkorokamui of the Ainu, and possibly the Gorgon of ancient Greece. A battle with an octopus appears in Victor Hugo's book Toilers of the Sea, inspiring other works such as Ian Fleming's Octopussy. Octopuses appear in Japanese erotic art, shunga. They are eaten and considered a delicacy by humans in many parts of the world, especially the Mediterranean and the Asian seas.

## Etymology and pluralisation

[edit]

See also: Plural form of words ending in -us

The scientific Latin term octopus was derived from Ancient Greek ὀκτώπους (oktōpous), a compound form of ὀκτώ (oktō, 'eight') and πούς (pous, 'foot'), itself a variant form of ὀκτάπους, a word used for example by Alexander of Tralles (c. 525 – c. 605) for the common octopus.[5][6][7] The standard pluralised form of octopus in English is octopuses;[8] the Ancient Greek plural ὀκτώποδες, octopodes (/ɒkˈtɒpədiːz/), has also been used historically.[9] The alternative plural octopi is usually considered incorrect because it wrongly assumes that octopus is a Latin second-declension -us noun or adjective when, in either Greek or Latin, it is a third-declension noun.[10][11]

Historically, the first plural to commonly appear in English language sources, in the early 19th century, is the Latinate form octopi,[12] followed by the English form octopuses in the latter half of the same century. The Hellenic plural is roughly contemporary in usage, although it is also the rarest.[13]

Fowler's Modern English Usage states that the only acceptable plural in English is octopuses, that octopi is misconceived, and octopodes pedantic;[14][15][16] the last is nonetheless used frequently enough to be acknowledged by the descriptivist Merriam-Webster 11th Collegiate Dictionary and Webster's New World College Dictionary. The Oxford English Dictionary lists octopuses, octopi, and octopodes, in that order, reflecting frequency of use, calling octopodes rare and noting that octopi is based on a misunderstanding.[17] The New Oxford American Dictionary (3rd Edition, 2010) lists octopuses as the only acceptable pluralisation, and indicates that octopodes is still occasionally used, but that octopi is incorrect.[18]

## Anatomy and physiology

[edit]

### Size

[edit]

See also: Cephalopod size

A giant Pacific octopus at Echizen Matsushima Aquarium, Japan

The giant Pacific octopus (Enteroctopus dofleini) is often cited as the largest known octopus species. Adults usually weigh 10–50 kg (22–110 lb), with an arm span of up to 4.8 m (16 ft).[19] The largest specimen of this species to be scientifically documented was an animal with a live mass of 71 kg (157 lb).[20] Much larger sizes have been claimed for the giant Pacific octopus:[21] one specimen was recorded as 272 kg (600 lb) with an arm span of 9 m (30 ft).[22] A carcass of the seven-arm octopus, Haliphron atlanticus, weighed 61 kg (134 lb) and was estimated to have had a live mass of 75 kg (165 lb).[23][24] The smallest species is Octopus wolfi, which is around 2.5 cm (1 in) and weighs less than 1 g (0.035 oz).[25]

### External characteristics

[edit]

The octopus has an elongated body that is bilaterally symmetrical along its dorso-ventral (back to belly) axis; the head and foot are on the ventral side but act as the anterior (front) of the animal. The heads contains both the mouth and the brain.[26] The mouth has a sharp chitinous beak and is surrounded by and underneath the foot, which evolved into flexible, prehensile cephalopod limbs, known as "arms", which are attached to each other near their base by a webbed structure.[26][27][28] The arms can be described based on side and sequence position (such as L1, R1, L2, R2) and divided into four pairs.[29] The two rear appendages are generally used to walk on the sea floor, while the other six are used to forage for food.[30] The bulbous and hollow mantle is fused to the back of the head and contains most of the vital organs.[28][27] The mantle also has a cavity with muscular walls and a pair of gills; it is connected to the exterior by a funnel or siphon.[26][31]

Diagram of octopus from side, with gills, funnel, eye, ocellus (eyespot), web, arms, suckers, hectocotylus and ligula labelled.

The skin consists of a thin outer epidermis with mucous cells and sensory cells and a fibrous inner dermis made of collagen and containing various cells allowing colour change.[32] Most of the body is made of soft tissue, allowing it to squeeze through tiny gaps; even the larger species can pass through a gap little more than 2.5 cm (1 in) in diameter.[27] Lacking skeletal support, the arms work as muscular hydrostats and contain longitudinal, transverse and circular muscles around a central axial nerve. They can squash and stretch, coil at any place in any direction or stiffen.[33][34]

The interior surfaces of the arms are covered with circular, adhesive suckers. The suckers allow the octopus to secure itself in place or to handle objects. Each sucker is usually circular and bowl-like and has two distinct parts: an outer disc-shaped infundibulum and a inner cup-like called an acetabulum, both of which are thick muscles covered in connective tissue. A chitinous cuticle lines the outer surface. When a sucker attaches to a surface, the orifice between the two structures is sealed and the infundibulm flattens. Muscle contractions allow for attachment and detachment.[35][36][33] Each of the eight arms senses and responds to light, allowing the octopus to control the limbs even if its head is obscured.[37]

A finned Grimpoteuthis species with its atypical octopus body plan

The cranium of the octopus has two cartilaginous capsules which contain each of the animal's large eyes, which resemble those of fish. The cornea of the eye is formed from a translucent epidermal layer; the slit-shaped pupil forms a hole in the iris just behind the cornea. The lens hangs behind the pupil; photoreceptive retinal cells lines the back of the eye. The pupil can expand and contract; a retinal pigment screens incident light in bright conditions.[38]

Some species differ in form from the typical octopus body shape. Basal species, the Cirrina, have two fins located above the eyes, an internal shell and mostly webbed arms that are lined with fleshy papillae or cirri underneath. Grimpoteuthis in particular has a stout gelatinous body.[39]

### Circulatory system

[edit]

Octopuses have a closed circulatory system, in which the blood remains inside blood vessels. Octopuses have three hearts; a systemic or main heart that circulates blood around the body and two branchial or gill hearts that pump it through each of the two gills. The systemic heart becomes inactive when the animal is swimming. Thus, the octopus loses energy quickly and mostly crawls.[40][41] Octopus blood contains the copper-rich protein haemocyanin to transport oxygen. This makes the blood very viscous and it requires great pressure to pump it around the body; octopuses' blood pressures can supress 75 mmHg (10 kPa).[42][41][43] In cold conditions with low oxygen levels, haemocyanin transports oxygen more efficiently than haemoglobin.[44] The haemocyanin is dissolved in the plasma instead of being carried within blood cells and gives the blood a bluish colour.[42][41][45]

The systemic heart has muscular contractile walls and consists of a single ventricle and two atria, which attach it to each of the two gills. The blood vessels consist of arteries, capillaries and veins and are lined with a cellular endothelium which is quite unlike that of most other invertebrates. The blood circulates through the aorta and capillary system, to the venae cavae, after which the blood is pumped through the gills by the branchial hearts and back to the main heart. Much of the venous system is contractile, which helps circulate the blood.[46]

### Respiration

[edit]

Octopus with open siphon. The siphon is used for respiration, waste disposal and discharging ink.

Respiration involves drawing water into the mantle cavity through an aperture, passing it through the gills, and expelling it through the siphon. The ingress of water is achieved by contraction of radial muscles in the mantle wall, and flapper valves shut when strong circular muscles force the water out through the siphon.[47] Extensive connective tissue lattices support the respiratory muscles and allow them to inflate respiratory chamber.[48] The lamella structure of the gills allows for a high oxygen uptake, up to 65% in water at 20 °C (68 °F).[49] Respiration can also play a role in locomotion, and an octopus can propel its body when shooting water out of the siphon.[50][43]

The thin skin of the octopus absorbs additional oxygen. When resting, around 41% of an octopus's oxygen absorption is through the skin. Only 33% of oxygen is through the skin when the octopus swims,despite the amount of oxygen absorption increasing as water flows over the body. When it is resting after a meal, absorption through the skin can drop to 3% of its total oxygen uptake.[51]

### Digestion and excretion

[edit]

The digestive system of the octopus begins with the buccal mass which consists of the mouth with the beak, the pharynx, radula and salivary glands.[52] The radula is a serrated organ made of chitin.[27] Food is broken down and is forced into the osophagus by two lateral extensions of the esophageal side walls in addition to the radula. From there it is transferred to the gastrointestinal tract, which is mostly suspended from the roof of the mantle cavity. The tract consists of a crop, where the food is stored; a stomach, where it is smushed with other gut material; a caecum where the now sludgy food is separated into particles and liquids and which also absorbs fats; the digestive gland, where liver cells break down and absorb the fluid and become "brown bodies"; and the intestine, where the built-up waste is turned into faecal ropes by secretions and ejected out of the funnel via the rectum.[53]

During osmoregulation, fluid is added to the pericardia of the branchial hearts. The octopus has two nephridia (equivalent to vertebrate kidneys) which are associated with the branchial hearts; these and their associated ducts connect the pericardial cavities with the mantle cavity. Each branch of the vena cava have renal appendages which pass over the thin-walled nephridium before reaching to the branchial heart. Urine is first created in the pericardial cavity, and is altered by excretion, of mostly ammonia, and absorption from the renal appendages, as it is passed along the associated duct and through the nephridiopore into the mantle cavity.[54]

A common octopus (Octopus vulgaris) moving around. Its nervous system allows the arms to move with some autonomy.

### Nervous system and senses

[edit]

Octopuses and their relatives have a more expansive and complex nervous system than other invertebrates, containing over 500 million neurons, around the same as a dog.[55][56][57] Only part of it is localised in its brain, which is contained in a cartilaginous capsule. Two-thirds of an octopus's neurons are in the nerve cords of its arms. This allows their arms to perform actions with a level of independence.[58] Learning is mainly done in the brain, but an arm makes a decision when supplied with information.[59] Unlike in many other animals, including other mollusks, the complex motor skills of octopuses and their relatives are not organised in their brains via internal somatotopic maps of their bodies[60] Octopuses have the same jumping genes that are active in the human brain, implying an evolutionary convergence at molecular level.[61]

Eye of common octopus

Like other cephalopods, octopuses have camera-like eyes.[55] Colour vision appears to vary from species to species, for example, being present in O. aegina but absent in O. vulgaris.[62] Opsins in the skin respond to different wavelengths of light and help the animals choose a colouration that camouflages them; the chromatophores in the skin can respond to light independently of the eyes.[63][64] An alternative hypothesis is that cephalopod eyes in species that only have a single photoreceptor protein may use chromatic aberration to turn monochromatic vision into colour vision, though this sacrifices image quality. This would explain pupils shaped like the letter "U", the letter "W", or a dumbbell, as well as the need for colourful mating displays.[65]

Attached to the otic capules are two organs called statocysts (sac-like structures containing a mineralised mass and sensitive hairs), that allow the octopus to sense the orientation of its body, relative to both gravity and time (angular acceleration). An autonomic response keeps the octopus's eyes oriented so that the pupil is always horizontal.[38] Octopuses may also use the statocyst to hear sound. The common octopus can hear sounds between 400 Hz and 1000 Hz, and hears best at 600 Hz.[66]

Octopuses have an excellent somatosensory system. Their suction cups are equipped with chemoreceptors so they can taste what they touch.[67] Octopus arms move easily because the sensors recognise octopus skin and prevent self-attachment.[68] Octopuses appear to have poor proprioceptive sense and must observe the arms visually to keep track of their position.[69][70]

### Ink sac

[edit]

The ink sac of an octopus is located under the digestive gland. A gland attached to the sac produces the ink, and the sac holds it. The sac is close enough to the funnel for the octopus to shoot out the ink with a water jet. As the animal begins to shoot, the ink passes through glands which mix it with mucus and it leaves the funnel as a thick, dark blob which allows the animal to escape from a predator.[71] The main pigment in the ink is melanin, which gives it its black colour.[72] Cirrate octopuses usually lack the ink sac.[39]

## Life cycle

[edit]

### Reproduction

[edit]

Adult male Tremoctopus violaceus with hectocotylus

Octopuses have two sexes and have only one gonad (testis in males and ovary in females) which is posteriorly-located. The gonad deposits gametes into an adjacent cavity called the gonocoel. A gonoduct bridges the gonocoel with the mantle cavity.[73] An optic gland creates hormones that cause the octopus to mature and age and stimulate gamete production. The timing of reproduction and lifespan depends on environmental conditions such as temperature, light and nutrition, which trigger the gland.[74][75] The male has a specialised arm called a hectocotylus which it uses to transfer spermatophores (packets of sperm) into the female's mantle cavity.[73] The hectocotylus in Octopus is usually the R3 arm, which has a spoon-shaped depression and a suckerless tip.[76][73] Fertilisation may occurs in the mantle cavity or in the surrounding water.[73]

The reproduction has been studied in some species. In the giant Pacific octopus, courtship includes changes in skin texture and colour, mostly in the male. The male may cling to the top or side of the female or position himself beside her. There is some speculation that he may first use his hectocotylus to remove any spermatophore or sperm already present in the female. He picks up a spermatophore from his spermatophoric sac with the hectocotylus, inserts it into the female's mantle cavity, and deposits it in the correct location in the opening of the oviduct. Two spermatophores are transferred in this way; these are about one metre (yard) long, and the empty ends may protrude from the female's mantle.[77] A complex hydraulic mechanism releases the sperm from the spermatophore.[73]

Female giant Pacific octopus guarding strings of eggs

The eggs have large yolks; cleavage (division) is relatively shallow and a germinal disc develops at the pole. During gastrulation, the disc and surround the yolk, forming a yolk sac, which eventually forms part of the gut. The embryo forms as the dorsal side of the disc grows upward, with a shell gland, gills, mantle and eyes on its dorsal side. The arms and funnel form on the ventral side of the disc, with the former moving upward to surround the mouth. The embryo consumes the yolk during development.[73]

Over a month after mating, Giant Pacific octopuses lay eggs. The species can lay 180,000 eggs in a single clutch, while Octopus rubescens clutches number up to 45,000 eggs and O. vulgaris clutches can number as much as 500,000 eggs.[78]: 75 Fertilised octopus eggs are layed as strings and within a shelter.[77][79] Female giant Pacific octopuses nurture and protect their for five months (160 days) until they hatch.[77] In colder waters, such as those off Alaska, it may take up to ten months for the eggs to completely develop.[78]: 74 In the argonaut (paper nautilus), the female is much larger than the male. She secretes a thin shell shaped like a cornucopia, in which the eggs are deposited and in which she also resides and broods the young while swimming.[80]

Octopus paralarva, a planktonic hatchling

Most young octopuses hatch as paralarvae,[73] Octopus larave in particular are planktonic for weeks or months. Octopus larave feed on shrimps, isopods and amphipods, eventually settling on the ocean floor and developing into adults.[81] Octopus species that produce larger eggs instead hatch as benthic animals similar to the adults.[78]: 74–75 These include the southern blue-ringed, Caribbean reef, California two-spot and Eledone moschata[82]

### Lifespan

[edit]

Octopuses have short lifespans living for up to four years,[83] and the lifecycles of some species finish in less than half a year.[84] For most octopuses, the last stage of their life is called senescence. It is the breakdown of cellular function without repair or replacement. It may last from weeks to a few months, at most. Males enter senesce after maturity while for, it is noticeable after they lay a clutch of eggs. During senescence, an octopus does not feed and quickly weakens and becomes sluggish. Lesions begin to form and the octopus literally degenerates. They may die of starvation or get picked off by predators.[85] Senescence is trigger by the optic glands and experimental removal of them after spawning was found to result in the continuation of their lifecycle and activity as well as longer lifespans. It has been proposed that the naturally short lifespan may prevent rapid overpopulation.[86]

## Distribution and habitat

[edit]

Octopus cyanea in Kona, Hawaii

Octopuses live in every ocean, and different species have adapted to different marine habitats. As juveniles, common octopuses inhabit shallow tide pools. The Hawaiian day octopus (Octopus cyanea) lives on coral reefs; argonauts float in pelagic waters. Abdopus aculeatus is a near-shore species and can be found in seagrass beds. Some species can survive in deeper environments. The spoon-armed octopus (Bathypolypus arcticus) can live 1,000 m (3,300 ft) deep, and Vulcanoctopus hydrothermalis lives in depths of 2,000 m (6,600 ft) around hydrothermal vents.[28] Some species, such as Megaleledone setebos and Pareledone charcoti, can surive in the chilling waters of the Antarctic, which reach −1.8 °C (29 °F).[44] No species are known to live in fresh water.[87]

The cirrate species are often free-swimming and live in deep-water habitats.[88] Although several species are known to live at bathyal and abyssal depths, there is only a single indisputable record of an octopus in the hadal zone; a species of Grimpoteuthis (dumbo octopus) photographed at 6,957 m (22,825 ft).[89]

## Behaviour and ecology

[edit]

Octopuses are considered to be mostly solitary[90] though a few are known to occur in high densities and interact regularly, usually in the context of dominance and reproductive competition. This is likely the result of abundant food supplies combined with less den sites.[91] The Larger Pacific striped octopus has been described as particularly social, living in groups of up to 40 individuals.[92][93] Octopuses hide in dens, which are typically crevices in rocky or other hard structures, including man-made ones. Small species will even use abandoned shells and bottles.[94] They can navigate back to a den without having to retrace their outward route.[95] They are not migratory.[96]

Octopuses bring captured prey to the den to eat. Dens are often surrounded by a midden of dead and uneaten food items. These middens may attract scavengers like fish, molluscs and echinoderms.[97] On rare occasions, octopuses hunt cooperatively with other species, with fish as their partners. They regulate the species composition of the hunting group — and the behavior of their partners — by punching them.[98]

### Feeding

[edit]

Veined octopus eating a crab

Nearly all octopuses are predatory; bottom-dwelling octopuses eat mainly crustaceans, polychaete worms, and other molluscs such as whelks and clams; open-ocean octopuses eat mainly prawns, fish and other cephalopods.[99] Major items in the diet of the giant Pacific octopus include bivalve molluscs such as the cockle Clinocardium nuttallii, clams and scallops and crustaceans such as crabs and spider crabs. Prey that it is likely to reject include moon snails because they are too large and limpets, rock scallops, chitons and abalone, because they are too securely fixed to the rock.[97] Small cirrate octopuses such as those of the genera Grimpoteuthis and Opisthoteuthis typically prey on polychaetes, copepods, amphipods and isopods.[100]

A benthic (bottom-dwelling) octopus typically moves among the rocks and feels through the crevices. The creature may make a jet-propelled pounce on prey and pull it toward the mouth with its arms, the suckers restraining it. Small prey may be completely trapped by the webbed structure. Octopuses usually inject crustaceans like crabs with a paralysing saliva then dismember them with their beaks.[99][101] Octopuses feed on shelled molluscs either by forcing the valves apart, or by drilling a hole in the shell to inject a nerve toxin.[102][101] It used to be thought that the hole was drilled by the radula, but it has now been shown that minute teeth at the tip of the salivary papilla are involved, and an enzyme in the toxic saliva is used to dissolve the calcium carbonate of the shell. It takes about three hours for O. vulgaris to create a 0.6 mm (0.024 in) hole. Once the shell is penetrated, the prey dies almost instantaneously, its muscles relax, and the soft tissues are easy for the octopus to remove. Crabs may also be treated in this way; tough-shelled species are more likely to be drilled, and soft-shelled crabs are torn apart.[103]

Some species have other modes of feeding. Grimpoteuthis has a reduced or non-existent radula and swallows prey whole.[39] In the deep-sea genus Stauroteuthis, some of the muscle cells that control the suckers in most species have been replaced with photophores which are believed to fool prey by directing them to the mouth, making them one of the few bioluminescent octopuses.[104]

### Locomotion

[edit]

Octopuses swim with their arms trailing behind.

Octopuses mainly move about by relatively slow crawling with some swimming in a head-first position. Jet propulsion or backward swimming, is their fastest means of locomotion, followed by swimming and crawling.[105] When in no hurry, they usually crawl on either solid or soft surfaces. Several arms are extended forward, some of the suckers adhere to the substrate and the animal hauls itself forward with its powerful arm muscles, while other arms may push rather than pull. As progress is made, other arms move ahead to repeat these actions and the original suckers detach. During crawling, the heart rate nearly doubles, and the animal requires 10 or 15 minutes to recover from relatively minor exercise.[33]

Most octopuses swim by expelling a jet of water from the mantle through the siphon into the sea. The physical principle behind this is that the force required to accelerate the water through the orifice produces a reaction that propels the octopus in the opposite direction.[106] The direction of travel depends on the orientation of the siphon. When swimming, the head is at the front and the siphon is pointed backward but, when jetting, the visceral hump leads, the siphon points at the head and the arms trail behind, with the animal presenting a fusiform appearance. In an alternative method of swimming, some species flatten themselves dorso-ventrally, and swim with the arms held out sideways; this may provide lift and be faster than normal swimming. Jetting is used to escape from danger, but is physiologically inefficient, requiring a mantle pressure so high as to stop the heart from beating, resulting in a progressive oxygen deficit.[105]

Movements of the finned species Cirroteuthis muelleri

Cirrate octopuses cannot produce jet propulsion and rely on their fins for swimming. They have neutral buoyancy and drift through the water with the fins extended. They can also contract their arms and surrounding web to make sudden moves known as "take-offs". Another form of locomotion is "pumping", which involves symmetrical contractions of muscles in their webs producing peristaltic waves. This moves the body slowly.[39]

In 2005, Adopus aculeatus and veined octopus (Amphioctopus marginatus) were found to walk on two arms, while at the same time mimicking plant matter.[107] This form of locomotion allows these octopuses to move quickly away from a potential predator without being recognised.[105] Some species of octopus can crawl out of the water briefly, which they may do between tide pools.[108][109] "Stilt walking" is used by the veined octopus when carrying stacked coconut shells. The octopus carries the shells underneath it with two arms, and progresses with an ungainly gait supported by its remaining arms held rigid.[110]

### Intelligence

[edit]

Main article: Cephalopod intelligence

Octopus opening a container by unscrewing its cap

Octopuses are highly intelligent.[111] Maze and problem-solving experiments have shown evidence of a memory system that can store both short- and long-term memory.[112] Young octopuses learn nothing from their parents, as adults provide no parental care beyond tending to their eggs until the young octopuses hatch.[78]: 75

In laboratory experiments, octopuses can readily be trained to distinguish between different shapes and patterns. They have been reported to practise observational learning,[113] although the validity of these findings is contested.[111] Octopuses have also been observed in what has been described as play: repeatedly releasing bottles or toys into a circular current in their aquariums and then catching them.[114] Octopuses often break out of their aquariums and sometimes into others in search of food.[108][115][116] Growing evidence suggests that octopuses are sentient and capable of experiencing pain.[117] The veined octopus collects discarded coconut shells, then uses them to build a shelter, an example of tool use.[110]

### Camouflage and colour change

[edit]

Video of Octopus cyanea moving and changing its colour, shape, and texture

Octopuses use camouflage when hunting and to avoid predators. To do this, they use specialised skin cells that change the appearance of the skin by adjusting its colour, opacity, or reflectivity. Chromatophores contain yellow, orange, red, brown, or black pigments; most species have three of these colours, while some have two or four. Other colour-changing cells are reflective iridophores and white leucophores.[118] This colour-changing ability is also used to communicate with or warn other octopuses.[119] The energy cost of the complete activation of the chromatophore system is very high equally being nearly as much as all the energy used by an octopus at rest.[120]

Octopuses can create distracting patterns with waves of dark colouration across the body, a display known as the "passing cloud". Muscles in the skin change the texture of the mantle to achieve greater camouflage. In some species, the mantle can take on the bumpy appearance of algae-covered rocks. Octopuses that are diurnal and live in shallow water have evolved more complex skin than their nocturnal and deep-sea counterparts. In the latter species, skin anatomy is limited to one colour or pattern.[121]

A "moving rock" trick involves the octopus mimicking a rock and then inching across the open space with a speed matching that of the surrounding water.[122]

### Defence

[edit]

Warning display of greater blue-ringed octopus (Hapalochlaena lunulata)

Aside from humans, octopuses may be preyed on by fishes, seabirds, sea otters, pinnipeds, cetaceans, and other cephalopods.[123] Octopuses typically hide or disguise themselves by camouflage and mimicry; some have conspicuous warning coloration (aposematism) or deimatic behaviour (“bluffing” a seemingly threatening appearance).[119] An octopus may spend 40% of its time hidden away in its den. When the octopus is approached, it may extend an arm to investigate. 66% of Enteroctopus dofleini in one study had scars, with 50% having amputated arms.[123] The blue rings of the highly venomous blue-ringed octopus are hidden in muscular skin folds which contract when the animal is threatened, exposing the iridescent warning.[124] The Atlantic white-spotted octopus (Callistoctopus macropus) turns bright brownish red with oval white spots all over in a high contrast display.[125] Displays are often reinforced by stretching out the animal's arms, fins or web to make it look as big and threatening as possible.[126]

Once they have been seen by a predator, they commonly try to escape but can also create a distraction by ejecting an ink cloud from their ink sac. The ink is thought to reduce the efficiency of olfactory organs, which would aid evasion from predators that employ smell for hunting, such as sharks. Ink clouds of some species might act as pseudomorphs, or decoys that the predator attacks instead.[127]

When under attack, some octopuses can perform arm autotomy, in a manner similar to the way skinks and other lizards detach their tails. The crawling arm may distract would-be predators. Such severed arms remain sensitive to stimuli and move away from unpleasant sensations.[128] Octopuses can replace lost limbs.[129]

Some octopuses, such as the mimic octopus, can combine their highly flexible bodies with their colour-changing ability to mimic other, more dangerous animals, such as lionfish, sea snakes, and eels.[130][131]

### Pathogens and parasites

[edit]

The diseases and parasites that affect octopuses have been little studied, but cephalopods are known to be the intermediate or final hosts of various parasitic cestodes, nematodes and copepods; 150 species of protistan and metazoan parasites have been recognised.[132] The Dicyemidae are a family of tiny worms that are found in the renal appendages of many species;[133] it is unclear whether they are parasitic or endosymbionts. Coccidians in the genus Aggregata living in the gut cause severe disease to the host. Octopuses have an innate immune system; their haemocytes respond to infection by phagocytosis, encapsulation, infiltration, or cytotoxic activities to destroy or isolate the pathogens. The haemocytes play an important role in the recognition and elimination of foreign bodies and wound repair. Captive animals are more susceptible to pathogens than wild ones.[134] A gram-negative bacterium, Vibrio lentus, can cause skin lesions, exposure of muscle and sometimes death.[135]

## Evolution

[edit]

Further information: Evolution of cephalopods

The scientific name Octopoda was first coined and given as the order of octopuses in 1818 by English biologist William Elford Leach,[136] who classified them as Octopoida the previous year.[2] The Octopoda consists of around 300 known species[137] and were historically divided into two suborders, the Incirrina and the Cirrina.[88] More recent evidence suggests Cirrina is merely the most basal species, not a unique clade.[138] The incirrate octopuses (the majority of species) lack the cirri and paired swimming fins of the cirrates.[88] In addition, the internal shell of incirrates is either present as a pair of stylets or absent altogether.[139]

### Fossil history and phylogeny

[edit]

The octopuses evolved from the Muensterelloidea (fossil pictured) in the Jurassic period.[140]

The Cephalopoda evolved from a mollusc resembling the Monoplacophora in the Cambrian some 530 million years ago. The Coleoidea diverged from the nautiloids in the Devonian some 416 million years ago. In turn, the coleoids (including the squids and octopods) brought their shells inside the body and some 276 million years ago, during the Permian, split into the Vampyropoda and the Decabrachia.[141] The octopuses arose from the Muensterelloidea within the Vampyropoda in the Jurassic. The earliest octopus likely lived near the sea floor (benthic to demersal) in shallow marine environments.[141][142][140] Octopuses consist mostly of soft tissue, and so fossils are relatively rare. As soft-bodied cephalopods, they lack the external shell of most molluscs, including other cephalopods like the nautiloids and the extinct Ammonoidea.[143] They have eight limbs like other Coleoidea, but lack the extra specialised feeding appendages known as tentacles which are longer and thinner with suckers only at their club-like ends.[144] The vampire squid (Vampyroteuthis) also lacks tentacles but has sensory filaments.[145]

The cladograms are based on Sanchez et al., 2018, who created a molecular phylogeny based on mitochondrial and nuclear DNA marker sequences.[138] The position of the Eledonidae is from Ibáñez et al., 2020, with a similar methodology.[146] Dates of divergence are from Kröger et al., 2011 and Fuchs et al., 2019.[141][140]

Cephalopods |

| Nautiloids |

Nautilus

|

Coleoids |

| Decabrachia |

Squids and cuttlefish

|

Vampyropoda  |

| Vampyromorphida |

|

Octopods |

155 mya

276 mya

416 mya

530 mya

The molecular analysis of the octopods shows that the suborder Cirrina (Cirromorphida) and the superfamily Argonautoidea are paraphyletic and are broken up; these names are shown in quotation marks and italics on the cladogram.

Octopoda |

| "Cirromorphida" part  |

|  |

Cirroteuthidae

|

Stauroteuthidae

| "Cirromorphida" part  |

|  |

Opisthoteuthidae

|

Cirroctopodidae

Octopodida |

| "Argonautoidea" part  |

|  |

Tremoctopodidae

|

Alloposidae

|  |

| "Argonautoidea" part  |

|  |

Argonautidae

|

Ocythoidae

Octopodoidea |

|  |

Eledonidae

|

|  |

Bathypolypodidae

|

|  |

Enteroctopodidae

|

|  |

Octopodidae

|

Megaleledonidae

|  |

Bolitaenidae

|

|  |

Amphitretidae

|

Vitreledonellidae

### RNA editing and the genome

[edit]

Octopuses, like other coleoid cephalopods but unlike more basal cephalopods or other molluscs, are capable of greater RNA editing, changing the nucleic acid sequence of the primary transcript of RNA molecules, than any other organisms. Editing is concentrated in the nervous system, and affects proteins involved in neural excitability and neuronal morphology. More than 60% of RNA transcripts for coleoid brains are recoded by editing, compared to less than 1% for a human or fruit fly. Coleoids rely mostly on ADAR enzymes for RNA editing, which requires large double-stranded RNA structures to flank the editing sites. Both the structures and editing sites are conserved in the coleoid genome and the mutation rates for the sites are severely hampered. Hence, greater transcriptome plasticity has come at the cost of slower genome evolution.[147][148]

The octopus genome is unremarkably bilaterian except for large developments of two gene families: protocadherins, which regulate the development of neurons; and the C2H2 zinc-finger transcription factors. Many genes specific to cephalopods are expressed in the animals' skin, suckers, and nervous system.[55]

## Relationship to humans

[edit]

### In art, literature, and mythology

[edit]

Minoan clay vase with octopus decoration, c. 1500 BC

Ancient seafaring people were aware of the octopus, as evidenced by artworks and designs. For example, a stone carving found in the archaeological recovery from Bronze Age Minoan Crete at Knossos (1900–1100 BC) depicts a fisherman carrying an octopus.[149] The terrifyingly powerful Gorgon of Greek mythology may have been inspired by the octopus or squid, the octopus itself representing the severed head of Medusa, the beak as the protruding tongue and fangs, and its tentacles as the snakes.[150] The kraken is a legendary sea monster of giant proportions said to dwell off the coasts of Norway and Greenland, usually portrayed in art as a giant octopus attacking ships. Linnaeus included it in the first edition of his 1735 Systema Naturae.[151][152] One translation of the Hawaiian creation myth the Kumulipo suggests that the octopus is the lone survivor of a previous age.[153][154][155] The Akkorokamui is a gigantic octopus-like monster from Ainu folklore, worshipped in Shinto.[156]

A battle with an octopus plays a significant role in Victor Hugo's 1866 book Travailleurs de la mer (Toilers of the Sea).[157] Ian Fleming's 1966 short story collection Octopussy and The Living Daylights, and the 1983 James Bond film were partly inspired by Hugo's book.[158] Japanese erotic art, shunga, includes ukiyo-e woodblock prints such as Katsushika Hokusai's 1814 print Tako to ama (The Dream of the Fisherman's Wife), in which an ama diver is sexually intertwined with a large and a small octopus.[159][160] The print is a forerunner of tentacle erotica.[161] The biologist P. Z. Myers noted in his science blog, Pharyngula, that octopuses appear in "extraordinary" graphic illustrations involving women, tentacles, and bare breasts.[162][163]

Since it has numerous arms emanating from a common centre, the octopus is often used as a symbol for a powerful and manipulative organisation, company, or country.[164]

The Beatles song "Octopus's Garden", on the band's 1969 album Abbey Road, was written by Ringo Starr after he was told about how octopuses travel along the sea bed picking up stones and shiny objects with which to build gardens.[165]

### Danger to humans

[edit]

Pen and wash drawing of an imagined colossal octopus attacking a ship, by the malacologist Pierre de Montfort, 1801

Octopuses generally avoid humans, but incidents have been verified. For example, a 2.4-metre (8 ft) Pacific octopus, said to be nearly perfectly camouflaged, "lunged" at a diver and "wrangled" over his camera before it let go. Another diver recorded the encounter on video.[166] All species are venomous, but only blue-ringed octopuses have venom that is lethal to humans.[167] Blue-ringed octopuses are among the deadliest animals in the sea; their bites are reported each year across the animals' range from Australia to the eastern Indo-Pacific Ocean. They bite only when provoked or accidentally stepped upon; bites are small and usually painless. The venom appears to be able to penetrate the skin without a puncture, given prolonged contact. It contains tetrodotoxin, which causes paralysis by blocking the transmission of nerve impulses to the muscles. This causes death by respiratory failure leading to cerebral anoxia. No antidote is known, but if breathing can be kept going artificially, patients recover within 24 hours.[168][169] Bites have been recorded from captive octopuses of other species; they leave swellings which do not last very long.[170]

### As a food source

[edit]

Main article: Octopus as food

Octopus sushi

Octopus fisheries exist around the world with total catches varying between 245,320 and 322,999 metric tons from 1986 to 1995.[171] The world catch peaked in 2007 at 380,000 tons, and had fallen by a tenth by 2012.[172] Methods to capture octopuses include pots, traps, trawls, snares, drift fishing, spearing, hooking and hand collection.[171] Octopuses have a food conversion efficiency greater than that of chickens, making octopus aquaculture a possibility.[173] Octopuses compete with human fisheries targeting other species, and even rob traps and nets for their catch; they may, themselves, be caught as bycatch if they cannot get away.[174]

Octopus is eaten in many cultures, such as those on the Mediterranean and Asian coasts.[175] The arms and other body parts are prepared in ways that vary by species and geography. Live octopuses or their wriggling pieces are consumed as ikizukuri in Japanese cuisine and san-nakji in Korean cuisine.[176][177] If not prepared properly, however, the severed arms can still choke the diner with their suction cups, causing at least one death in 2010.[178] Animal welfare groups have objected to the live consumption of octopuses on the basis that they can experience pain.[179]

### In science and technology

[edit]

In classical Greece, Aristotle (384–322 BC) commented on the colour-changing abilities of the octopus, both for camouflage and for signalling, in his Historia animalium: "The octopus ... seeks its prey by so changing its colour as to render it like the colour of the stones adjacent to it; it does so also when alarmed."[180] Aristotle noted that the octopus had a hectocotyl arm and suggested it might be used in sexual reproduction. This claim was widely disbelieved until the 19th century. It was described in 1829 by the French zoologist Georges Cuvier, who supposed it to be a parasitic worm, naming it as a new species, Hectocotylus octopodis.[181][182] Other zoologists thought it a spermatophore; the German zoologist Heinrich Müller believed it was "designed" to detach during copulation. In 1856, the Danish zoologist Japetus Steenstrup demonstrated that it is used to transfer sperm, and only rarely detaches.[183]

Flexible biomimetic 'Octopus' robotics arm. The BioRobotics Institute, Scuola Superiore Sant'Anna, Pisa, 2011[184]

Octopuses offer many possibilities in biological research, including their ability to regenerate limbs, change the colour of their skin, behave intelligently with a distributed nervous system, and make use of 168 kinds of protocadherins (humans have 58), the proteins that guide the connections neurons make with each other. The California two-spot octopus has had its genome sequenced, allowing exploration of its molecular adaptations.[55] Having independently evolved mammal-like intelligence, octopuses have been compared by the philosopher Peter Godfrey-Smith, who has studied the nature of intelligence,[185] to hypothetical intelligent extraterrestrials.[186] Their problem-solving skills, along with their mobility and lack of rigid structure enable them to escape from supposedly secure tanks in laboratories and public aquariums.[187]

Due to their intelligence, octopuses are listed in some countries as experimental animals on which surgery may not be performed without anesthesia, a protection usually extended only to vertebrates. In the UK from 1993 to 2012, the common octopus (Octopus vulgaris) was the only invertebrate protected under the Animals (Scientific Procedures) Act 1986.[188] In 2012, this legislation was extended to include all cephalopods[189] in accordance with a general EU directive.[190]

Some robotics research is exploring biomimicry of octopus features. Octopus arms can move and sense largely autonomously without intervention from the animal's central nervous system. In 2015 a team in Italy built soft-bodied robots able to crawl and swim, requiring only minimal computation.[191][192] In 2017, a German company made an arm with a soft pneumatically controlled silicone gripper fitted with two rows of suckers. It is able to grasp objects such as a metal tube, a magazine, or a ball, and to fill a glass by pouring water from a bottle.[193]

## See also

[edit]

* My Octopus Teacher – 2020 documentary film by Pippa Ehrlich and James Reed

## Notes

[edit]

1. ^ See § Etymology and pluralisation for variants.
2. ^ "Tentacle" is a common umbrella term for cephalopod limbs. In teuthological context, octopuses have "arms" with suckers along their entire length while "tentacle" is reserved for appendages with suckers only near the end of the limb, which octopuses lack.[4]

## References

[edit]

1. ^ "ITIS Report: Octopoda Leach, 1818". Itis.gov. 10 April 2013. Retrieved 4 February 2014.
2. ^ a b "Coleoidea – Recent cephalopods". Mikko's Phylogeny Archive.
3. ^ "Octopoda". Merriam-Webster.com Dictionary. Merriam-Webster. Retrieved 12 July 2021.
4. ^ Scully, Caitlin (11 October 2018). "Get to Know th Four Types of Cephalopod". Birch Aquarium Blog. U CSan Diego.
5. ^ Harper, Douglas. "octopus". Online Etymology Dictionary.
6. ^ "Octopus". Dictionary.reference.com. Retrieved 4 February 2014.
7. ^ ὀκτάπους, ὀκτώπους. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
8. ^ Michel, Jean-Baptiste; Shen, Yuan; Aiden, Aviva; Veres, Adrian; Gray, Matthew; Pickett, Joseph; Hoiberg, Dale; Clancy, Dan; Norvig, Peter; Orwant, Jon; Pinker, Steven; Nowak, Martin (2011). "Quantitative Analysis of Culture Using Millions of Digitized Books". Science. 331 (6014): 176–182\. Bibcode:2011Sci...331..176M. doi:10.1126/science.1199644. PMC 3279742. PMID 21163965.176-182&rft.date=2011&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279742#id-name=PMC&rft_id=info:pmid/21163965&rft_id=info:doi/10.1126/science.1199644&rft_id=info:bibcode/2011Sci...331..176M&rft.aulast=Michel&rft.aufirst=Jean-Baptiste&rft.au=Shen,+Yuan&rft.au=Aiden,+Aviva&rft.au=Veres,+Adrian&rft.au=Gray,+Matthew&rft.au=Pickett,+Joseph&rft.au=Hoiberg,+Dale&rft.au=Clancy,+Dan&rft.au=Norvig,+Peter&rft.au=Orwant,+Jon&rft.au=Pinker,+Steven&rft.au=Nowak,+Martin&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279742&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988"> Relevant data at Google Ngram Viewer.
9. ^ "Octopus". Oxforddictionaries.com. 2014. Archived from the original on 30 October 2012. Retrieved 4 February 2014.
10. ^ Peters, Pam (2004). The Cambridge Guide to English Usage. Cambridge: Cambridge University Press. ISBN 0-521-62181-X, p. 388.
11. ^ Fowler, Henry Watson (1994). A Dictionary of Modern English Usage. Wordsworth Editions. p. 316. ISBN 978-1-85326-318-7. "In Latin plurals there are some traps for non-Latinists; the termination of the singular is no sure guide to that of the plural. Most Latin words in -us have plural in -i, but not all, & so zeal not according to knowledge issues in such oddities as...octopi...; as caution the following list may be useful:...octopus, -podes"
12. ^ Tuckey, James Hingston; Smith, Christen (1818). Narrative of an Expedition to Explore the River Zaire. Kirk & Mercein.
13. ^ "The Many Plurals of 'Octopus'". www.merriam-webster.com.
14. ^ Butterfield, Jeremy (2015). Fowler's Dictionary of Modern English Usage. Oxford University Press. ISBN 978-0-19-174453-2. "The only correct plural in English is octopuses. The Greek original is ὀκτώπους, -ποδ- (which would lead to a pedantic English pl. form octopodes). The pl. form octopi, which is occasionally heard (mostly in jocular use), though based on modL octopus, is misconceived"
15. ^ "Chambers Reference Online". Chambers 21st Century Dictionary. Chambers Harrap. 1996. Retrieved 5 February 2024.
16. ^ Stamper, Kory. Ask the editor: octopus. Merriam-Webster. Archived from the original on 30 April 2013. Retrieved 26 June 2013.
17. ^ "octopus". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
18. ^ Stevenson, Angus; Lindberg, Christine A., eds. (2010). New Oxford American Dictionary (3rd ed.). Oxford University Press. ISBN 978-0-19-539288-3.
19. ^ "Giant Pacific Octopus (Enteroctopus dofleini)". Alaska Department of Fish and Game. Retrieved 22 February 2025.
20. ^ Cosgrove, J.A. 1987. Aspects of the Natural History of Octopus dofleini, the Giant Pacific Octopus. MSc Thesis. Department of Biology, University of Victoria (Canada), 101 pp.
21. ^ Norman, M. 2000. Cephalopods: A World Guide. ConchBooks, Hackenheim. p. 214.
22. ^ High, William L. (1976). "The giant Pacific octopus" (PDF). Marine Fisheries Review. 38 (9): 17–22\. Archived from the original (PDF) on 23 January 2017. Retrieved 4 November 2016.17-22&rft.date=1976&rft.aulast=High&rft.aufirst=William+L.&rft_id=http://spo.nmfs.noaa.gov/mfr389/mfr3893.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
23. ^ O'Shea, S. (2004). "The giant octopus Haliphron atlanticus (Mollusca : Octopoda) in New Zealand waters". New Zealand Journal of Zoology. 31 (1): 7–13\. doi:10.1080/03014223.2004.9518353. S2CID 84954869.7-13&rft.date=2004&rft_id=info:doi/10.1080/03014223.2004.9518353&rft_id=https://api.semanticscholar.org/CorpusID:84954869#id-name=S2CID&rft.aulast=O'Shea&rft.aufirst=S.&rft_id=https://doi.org/10.1080%2F03014223.2004.9518353&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
24. ^ O'Shea, S. (2002). "Haliphron atlanticus – a giant gelatinous octopus" (PDF). Biodiversity Update. 5: 1.
25. ^ Bradford, Alina (21 July 2016). "Octopus Facts". Live Science. Retrieved 26 April 2017.
26. ^ a b c Ruppert, Fox & Barnes (2004), pp. 343–344.
27. ^ a b c d Courage (2013), pp. 40–41.
28. ^ a b c Mather, Anderson & Wood (2010), pp. 13–15.
29. ^ Wells (1978), p. 12.
30. ^ Ruth A., Byrne; Kuba, Michael J.; Meisel, Daniela V.; Griebel, Ulrike; Mather, Jennifer A. (August 2006). "Does Octopus vulgaris have preferred arms?". Journal of Comparative Psychology. 120 (3): 198–204\. doi:10.1037/0735-7036.120.3.198. PMID 16893257.198-204&rft.date=2006-08&rft_id=info:doi/10.1037/0735-7036.120.3.198&rft_id=info:pmid/16893257&rft.aulast=Ruth+A.&rft.aufirst=Byrne&rft.au=Kuba,+Michael+J.&rft.au=Meisel,+Daniela+V.&rft.au=Griebel,+Ulrike&rft.au=Mather,+Jennifer+A.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
31. ^ Semmens (2004). "Understanding octopus growth: patterns, variability and physiology". Marine and Freshwater Research. 55 (4): 367. doi:10.1071/MF03155. S2CID 84208773.
32. ^ Ruppert, Fox & Barnes (2004), p. 362.
33. ^ a b c Carefoot, Thomas. "Octopuses and Relatives: Locomotion, Crawling". A Snail's Odyssey. Archived from the original on 22 May 2013. Retrieved 19 April 2017.
34. ^ Zelman, I.; Titon, M.; Yekutieli, Y.; Hanassy, S.; Hochner, B.; Flash, T. (2013). "Kinematic decomposition and classification of octopus arm movements". Frontiers in Computational Neuroscience. 7: 60. doi:10.3389/fncom.2013.00060. PMC 3662989. PMID 23745113.
35. ^ Tramacere, F.; Beccai, L.; Kuba, M.; Gozzi, A.; Bifone, A.; Mazzolai, B. (2013). "The morphology and adhesion mechanism of Octopus vulgaris suckers". PLOS ONE. 8 (6): e65074. Bibcode:2013PLoSO...865074T. doi:10.1371/journal.pone.0065074. PMC 3672162. PMID 23750233.
36. ^ Kier, W. M.; Smith, A. M. (2002). "The structure and adhesive mechanism of octopus suckers". Integrative and Comparative Biology. 42 (6): 1146–1153\. CiteSeerX 10.1.1.512.2605. doi:10.1093/icb/42.6.1146. PMID 21680399. S2CID 15997762.1146-1153&rft.date=2002&rft_id=https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.512.2605#id-name=CiteSeerX&rft_id=https://api.semanticscholar.org/CorpusID:15997762#id-name=S2CID&rft_id=info:pmid/21680399&rft_id=info:doi/10.1093/icb/42.6.1146&rft.aulast=Kier&rft.aufirst=W.+M.&rft.au=Smith,+A.+M.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
37. ^ Katz, Itamar; Shomrat, Tal; Nesher, Nir (1 January 2021). "Feel the light – sight independent negative phototactic response in octopus' arms". Journal of Experimental Biology. 224 (5). Bibcode:2021JExpB.224B7529K. doi:10.1242/jeb.237529. ISSN 0022-0949. PMID 33536305.
38. ^ a b Ruppert, Fox & Barnes (2004), pp. 360–361.
39. ^ a b c d "Finned Deep-sea Octopuses, Grimpoteuthis spp". MarineBio. 18 May 2017. Retrieved 14 May 2021.
40. ^ Wells (1978), pp. 19–20, 31–35.
41. ^ a b c Courage (2013), pp. 42–43.
42. ^ a b Wells (1978), pp. 31–35.
43. ^ a b Schmidt-Nielsen, Knut (1997). Animal Physiology: Adaptation and Environment. Cambridge University Press. p. 117\. ISBN 978-0-521-57098-5.
44. ^ a b Oellermann, M; Lieb, B; Pörtner, H-O; Semmens, J. M.; Mark, F. C. (2015). "Blue blood on ice: modulated blood oxygen transport facilitates cold compensation and eurythermy in an Antarctic octopod". Frontiers in Zoology. 12 (6): 6. doi:10.1186/s12983-015-0097-x. PMC 4403823. PMID 25897316.
45. ^ Mather, Anderson & Wood (2010), p. 22.
46. ^ Ruppert, Fox & Barnes (2004), p. 358.
47. ^ Carefoot, Thomas. "Octopuses and Relatives: Locomotion, jet propulsion". A Snail's Odyssey. Archived from the original on 28 April 2017. Retrieved 26 April 2017.
48. ^ Wells (1978), pp. 24–26.
49. ^ Wells, M. J.; Wells, J. (1995). "The control of ventilatory and cardiac responses to changes in ambient oxygen tension and oxygen demand in Octopus". The Journal of Experimental Biology. 198 (Pt 8): 1717–1727\. Bibcode:1995JExpB.198.1717W. doi:10.1242/jeb.198.8.1717. PMID 9319626.1717-1727&rft.date=1995&rft_id=info:pmid/9319626&rft_id=info:doi/10.1242/jeb.198.8.1717&rft_id=info:bibcode/1995JExpB.198.1717W&rft.aulast=Wells&rft.aufirst=M.+J.&rft.au=Wells,+J.&rft_id=http://jeb.biologists.org/content/198/8/1717&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
50. ^ Wells (1978), pp. 18.
51. ^ Wells, J. (1996). "Cutaneous respiration in Octopus vulgaris". The Journal of Experimental Biology. 199 (Pt 11): 2477–2483\. Bibcode:1996JExpB.199.2477M. doi:10.1242/jeb.199.11.2477. PMID 9320405.2477-2483&rft.date=1996&rft_id=info:pmid/9320405&rft_id=info:doi/10.1242/jeb.199.11.2477&rft_id=info:bibcode/1996JExpB.199.2477M&rft.aulast=Wells&rft.aufirst=J.&rft_id=http://jeb.biologists.org/content/199/11/2477&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
52. ^ Wells (1978), pp. 71–74.
53. ^ Wells (1978), pp. 75–79.
54. ^ Ruppert, Fox & Barnes (2004), pp. 358–359.
55. ^ a b c d Albertin, Caroline B.; Simakov, Oleg; Mitros, Therese; Wang, Z. Yan; Pungor, Judit R.; Edsinger-Gonzales, Eric; Brenner, Sydney; Ragsdale, Clifton W.; Rokhsar, Daniel S. (2015). "The octopus genome and the evolution of cephalopod neural and morphological novelties". Nature. 524 (7564): 220–224\. Bibcode:2015Natur.524..220A. doi:10.1038/nature14668. ISSN 0028-0836. PMC 4795812. PMID 26268193.220-224&rft.date=2015&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4795812#id-name=PMC&rft_id=info:bibcode/2015Natur.524..220A&rft_id=info:pmid/26268193&rft_id=info:doi/10.1038/nature14668&rft.issn=0028-0836&rft.aulast=Albertin&rft.aufirst=Caroline+B.&rft.au=Simakov,+Oleg&rft.au=Mitros,+Therese&rft.au=Wang,+Z.+Yan&rft.au=Pungor,+Judit+R.&rft.au=Edsinger-Gonzales,+Eric&rft.au=Brenner,+Sydney&rft.au=Ragsdale,+Clifton+W.&rft.au=Rokhsar,+Daniel+S.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4795812&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
56. ^ Chung, Wen-Sung; Kurniawan, Nyoman D.; Marshall, N. Justin (10 January 2022). "Comparative brain structure and visual processing in octopus from different habitats". Current Biology. 32 (1): 97–110.e4. Bibcode:2022CBio...32E..97C. doi:10.1016/j.cub.2021.10.070. ISSN 1879-0445. PMID 34798049.
57. ^ Budelmann, B. U. (1995). "The cephalopod nervous system: What evolution has made of the molluscan design". In Breidbach, O.; Kutsch, W. (eds.). The nervous systems of invertebrates: An evolutionary and comparative approach. Birkhäuser. ISBN 978-3-7643-5076-5. LCCN 94035125.
58. ^ Hochner, B. (2012). "An Embodied View of Octopus Neurobiology". Current Biology. 22 (20): R887 – R892. Bibcode:2012CBio...22.R887H. doi:10.1016/j.cub.2012.09.001. PMID 23098601.R887+-+R892&rft.date=2012&rft_id=info:pmid/23098601&rft_id=info:doi/10.1016/j.cub.2012.09.001&rft_id=info:bibcode/2012CBio...22.R887H&rft.aulast=Hochner&rft.aufirst=B.&rft_id=https://doi.org/10.1016%2Fj.cub.2012.09.001&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
59. ^ Gutnick, T; Zullo, L; Hochner, B; Kuba, M. J. (2020). "Use of peripheral sensory information for central nervous control of arm movement by Octopus". Current Biology. 30 (21): 4322–4327\. doi:10.1016/j.cub.2020.08.037.4322-4327&rft.date=2020&rft_id=info:doi/10.1016/j.cub.2020.08.037&rft.aulast=Gutnick&rft.aufirst=T&rft.au=Zullo,+L&rft.au=Hochner,+B&rft.au=Kuba,+M.+J.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
60. ^ Zullo, L.; Sumbre, G.; Agnisola, C.; Flash, T.; Hochner, B. (2009). "Nonsomatotopic organization of the higher motor centers in Octopus". Current Biology. 19 (19): 1632–1636\. Bibcode:2009CBio...19.1632Z. doi:10.1016/j.cub.2009.07.067. PMID 19765993. S2CID 15852956.1632-1636&rft.date=2009&rft_id=info:doi/10.1016/j.cub.2009.07.067&rft_id=https://api.semanticscholar.org/CorpusID:15852956#id-name=S2CID&rft_id=info:pmid/19765993&rft_id=info:bibcode/2009CBio...19.1632Z&rft.aulast=Zullo&rft.aufirst=L.&rft.au=Sumbre,+G.&rft.au=Agnisola,+C.&rft.au=Flash,+T.&rft.au=Hochner,+B.&rft_id=https://doi.org/10.1016%2Fj.cub.2009.07.067&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
61. ^ Petrosino, Giuseppe; Ponte, Giovanna; Volpe, Massimiliano; et al. (18 May 2022). "Identification of LINE retrotransposons and long non-coding RNAs expressed in the octopus brain". BMC Biology. 20 (1): 116. doi:10.1186/s12915-022-01303-5. PMC 9115989. PMID 35581640. S2CID 231777147.
62. ^ Kawamura, G.; et al. (2001). "Color Discrimination Conditioning in Two Octopus Octopus aegina and O. vulgaris". Nippon Suisan Gakkaishi. 67 (1): 35–39\. doi:10.2331/suisan.67.35.35-39&rft.date=2001&rft_id=info:doi/10.2331/suisan.67.35&rft.aulast=Kawamura&rft.aufirst=G.&rft_id=https://doi.org/10.2331%2Fsuisan.67.35&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
63. ^ Kingston, Alexandra C. N.; Kuzirian, Alan M.; Hanlon, Roger T.; Cronin, Thomas W. (2015). "Visual phototransduction components in cephalopod chromatophores suggest dermal photoreception". Journal of Experimental Biology. 218 (10): 1596–1602\. Bibcode:2015JExpB.218.1596K. doi:10.1242/jeb.117945. hdl:11603/13387. ISSN 1477-9145. PMID 25994635.1596-1602&rft.date=2015&rft_id=info:hdl/11603/13387&rft_id=info:bibcode/2015JExpB.218.1596K&rft_id=info:pmid/25994635&rft_id=info:doi/10.1242/jeb.117945&rft.issn=1477-9145&rft.aulast=Kingston&rft.aufirst=Alexandra+C.+N.&rft.au=Kuzirian,+Alan+M.&rft.au=Hanlon,+Roger+T.&rft.au=Cronin,+Thomas+W.&rft_id=https://doi.org/10.1242%2Fjeb.117945&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
64. ^ Ramirez, M. Desmond; Oakley, Todd H. (2015). "Eye-independent, light-activated chromatophore expansion (LACE) and expression of phototransduction genes in the skin of Octopus bimaculoides". Journal of Experimental Biology. 218 (10): 1513–1520\. Bibcode:2015JExpB.218.1513R. doi:10.1242/jeb.110908. ISSN 1477-9145. PMC 4448664. PMID 25994633.1513-1520&rft.date=2015&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4448664#id-name=PMC&rft_id=info:bibcode/2015JExpB.218.1513R&rft_id=info:pmid/25994633&rft_id=info:doi/10.1242/jeb.110908&rft.issn=1477-9145&rft.aulast=Ramirez&rft.aufirst=M.+Desmond&rft.au=Oakley,+Todd+H.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4448664&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
65. ^ Stubbs, Alexander L.; Stubbs, Christopher W. (2016). "Spectral discrimination in color blind animals via chromatic aberration and pupil shape". Proceedings of the National Academy of Sciences. 113 (29): 8206–8211\. Bibcode:2016PNAS..113.8206S. doi:10.1073/pnas.1524578113. ISSN 0027-8424. PMC 4961147. PMID 27382180.8206-8211&rft.date=2016&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4961147#id-name=PMC&rft_id=info:bibcode/2016PNAS..113.8206S&rft_id=info:pmid/27382180&rft_id=info:doi/10.1073/pnas.1524578113&rft.issn=0027-8424&rft.aulast=Stubbs&rft.aufirst=Alexander+L.&rft.au=Stubbs,+Christopher+W.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4961147&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
66. ^ Hu, Marian Y.; Yan, Hong Young; Chung, Wen-Sung; Shiao, Jen-Chieh; Hwang, Pung-Pung (2009). "Acoustically evoked potentials in two cephalopods inferred using the auditory brainstem response (ABR) approach". Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 153 (3): 278–283\. doi:10.1016/j.cbpa.2009.02.040. ISSN 1095-6433. PMID 19275944. Archived from the original on 7 April 2022. Retrieved 13 March 2022.278-283&rft.date=2009&rft.issn=1095-6433&rft_id=info:pmid/19275944&rft_id=info:doi/10.1016/j.cbpa.2009.02.040&rft.aulast=Hu&rft.aufirst=Marian+Y.&rft.au=Yan,+Hong+Young&rft.au=Chung,+Wen-Sung&rft.au=Shiao,+Jen-Chieh&rft.au=Hwang,+Pung-Pung&rft_id=http://ntur.lib.ntu.edu.tw//handle/246246/162905&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
67. ^ van Giesen, L; Kilian, P. B.; Allard, C. A. H.; Bellon, N. W. (2020). "Molecular basis of chemotactile sensation in Octopus". Cell. 183 (3): 594–604\. doi:10.1016/j.cell.2020.09.008.594-604&rft.date=2020&rft_id=info:doi/10.1016/j.cell.2020.09.008&rft.aulast=van+Giesen&rft.aufirst=L&rft.au=Kilian,+P.+B.&rft.au=Allard,+C.+A.+H.&rft.au=Bellon,+N.+W.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
68. ^ Nesher, Nir; Levy, Guy; Grasso, Frank W.; Hochner, Binyamin (2014). "Self-Recognition Mechanism between Skin and Suckers Prevents Octopus Arms from Interfering with Each Other". Current Biology. 24 (11): 1271–1275\. Bibcode:2014CBio...24.1271N. doi:10.1016/j.cub.2014.04.024. ISSN 0960-9822. PMID 24835454. S2CID 16140159.1271-1275&rft.date=2014&rft_id=https://api.semanticscholar.org/CorpusID:16140159#id-name=S2CID&rft_id=info:bibcode/2014CBio...24.1271N&rft.issn=0960-9822&rft_id=info:doi/10.1016/j.cub.2014.04.024&rft_id=info:pmid/24835454&rft.aulast=Nesher&rft.aufirst=Nir&rft.au=Levy,+Guy&rft.au=Grasso,+Frank+W.&rft.au=Hochner,+Binyamin&rft_id=https://doi.org/10.1016%2Fj.cub.2014.04.024&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
69. ^ Gutnick, Tamar; Byrne, Ruth A.; Hochner, Binyamin; Kuba, Michael (2011). "Octopus vulgaris Uses Visual Information to Determine the Location of Its Arm". Current Biology. 21 (6): 460–462\. Bibcode:2011CBio...21..460G. doi:10.1016/j.cub.2011.01.052. PMID 21396818. S2CID 10152089.460-462&rft.date=2011&rft_id=info:doi/10.1016/j.cub.2011.01.052&rft_id=https://api.semanticscholar.org/CorpusID:10152089#id-name=S2CID&rft_id=info:pmid/21396818&rft_id=info:bibcode/2011CBio...21..460G&rft.aulast=Gutnick&rft.aufirst=Tamar&rft.au=Byrne,+Ruth+A.&rft.au=Hochner,+Binyamin&rft.au=Kuba,+Michael&rft_id=https://doi.org/10.1016%2Fj.cub.2011.01.052&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
70. ^ Kennedy, E. B. Lane; Buresch, Kendra C.; Boinapally, Preethi; Hanlon, Roger T. (2020). "Octopus arms exhibit exceptional flexibility". Scientific Reports. 10 (1): 20872. doi:10.1038/s41598-020-77873-7. PMC 7704652. PMID 33257824.
71. ^ Mather, Anderson & Wood (2010), p. 107.
72. ^ Derby, C. D. (2014). "Cephalopod Ink: Production, Chemistry, Functions and Applications". Marine Drugs. 12 (5): 2700–2730\. doi:10.3390/md12052700. PMC 4052311. PMID 24824020.2700-2730&rft.date=2014&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4052311#id-name=PMC&rft_id=info:pmid/24824020&rft_id=info:doi/10.3390/md12052700&rft.aulast=Derby&rft.aufirst=C.+D.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4052311&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
73. ^ a b c d e f g Ruppert, Fox & Barnes (2004), pp. 363–365.
74. ^ Mather, Anderson & Wood (2010), p. 147.
75. ^ Wells, Martin J.; Wells, J. (1972). "Optic glands and the state of the testis in Octopus". Marine Behaviour and Physiology. 1 (1–4): 71–83\. doi:10.1080/10236247209386890.1–4&rft.pages=71-83&rft.date=1972&rft_id=info:doi/10.1080/10236247209386890&rft.aulast=Wells&rft.aufirst=Martin+J.&rft.au=Wells,+J.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
76. ^ Wells (1978), pp. 12–14.
77. ^ a b c Carefoot, Thomas. "Octopuses and Relatives: Reproduction". A Snail's Odyssey. Archived from the original on 22 April 2017. Retrieved 11 April 2017.
78. ^ a b c d "Giant Pacific Octopus (Enteroctopus dofleini) Care Manual" (PDF). AZA (Association of Zoos and Aquariums) Aquatic Invertebrate Taxonomic Advisory Group in association with AZA Animal Welfare Committee. 9 September 2014. Retrieved 31 May 2016.
79. ^ Mather, Anderson & Wood (2010), p. 26.
80. ^ Mather, Anderson & Wood (2010), pp. 26, 141.
81. ^ Wells (1978), p. 178.
82. ^ Forsythe, J. W.; Hanlon, R. T. (1980). "A closed marine culture system for rearing Octopus joubini and other large-egged benthic octopods". Laboratory Animals. 14 (2): 137–142\. doi:10.1258/002367780780942737. PMID 7431823. S2CID 19492476.137-142&rft.date=1980&rft_id=https://api.semanticscholar.org/CorpusID:19492476#id-name=S2CID&rft_id=info:pmid/7431823&rft_id=info:doi/10.1258/002367780780942737&rft.aulast=Forsythe&rft.aufirst=J.+W.&rft.au=Hanlon,+R.+T.&rft_id=https://doi.org/10.1258%2F002367780780942737&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
83. ^ Mather, Anderson & Wood (2010), p. 17.
84. ^ Courage (2013), p. 152.
85. ^ Anderson, Roland C.; Wood, James B.; Byrne, Ruth A. (2002). "Octopus Senescence: The Beginning of the End". Journal of Applied Animal Welfare Science. 5 (4): 275–283\. CiteSeerX 10.1.1.567.3108. doi:10.1207/S15327604JAWS0504_02. PMID 16221078. S2CID 28355735.275-283&rft.date=2002&rft_id=https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.3108#id-name=CiteSeerX&rft_id=https://api.semanticscholar.org/CorpusID:28355735#id-name=S2CID&rft_id=info:pmid/16221078&rft_id=info:doi/10.1207/S15327604JAWS0504_02&rft.aulast=Anderson&rft.aufirst=Roland+C.&rft.au=Wood,+James+B.&rft.au=Byrne,+Ruth+A.&rft_id=https://www.researchgate.net/publication/7545324&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
86. ^ Wodinsky, Jerome (1977). "Hormonal Inhibition of Feeding and Death in Octopus: Control by Optic Gland Secretion". Science. 198 (4320): 948–951\. Bibcode:1977Sci...198..948W. doi:10.1126/science.198.4320.948. PMID 17787564. S2CID 22649186.948-951&rft.date=1977&rft_id=info:doi/10.1126/science.198.4320.948&rft_id=https://api.semanticscholar.org/CorpusID:22649186#id-name=S2CID&rft_id=info:pmid/17787564&rft_id=info:bibcode/1977Sci...198..948W&rft.aulast=Wodinsky&rft.aufirst=Jerome&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
87. ^ Norman, Mark (16 January 2013). "Ask an expert: Are there any freshwater cephalopods?". ABC Science. Retrieved 26 April 2017.
88. ^ a b c Marshall Cavendish Corporation (2004). Encyclopedia of the Aquatic World. Marshall Cavendish. p. 764\. ISBN 978-0-7614-7424-1.
89. ^ Jamieson, A.J.; Vecchione, M. (2020). "First in situ observation of Cephalopoda at hadal depths (Octopoda: Opisthoteuthidae: Grimpoteuthis sp.)". Marine Biology. 167 (82). Bibcode:2020MarBi.167...82J. doi:10.1007/s00227-020-03701-1.
90. ^ Mather, Anderson & Wood (2010), pp. 17, 134.
91. ^ Scheel, D.; et al. (2017). "A second site occupied by Octopus tetricus at high densities, with notes on their ecology and behavior". Marine and Freshwater Behaviour and Physiology. 50 (4): 285–291\. Bibcode:2017MFBP...50..285S. doi:10.1080/10236244.2017.1369851. S2CID 89738642.285-291&rft.date=2017&rft_id=https://api.semanticscholar.org/CorpusID:89738642#id-name=S2CID&rft_id=info:doi/10.1080/10236244.2017.1369851&rft_id=info:bibcode/2017MFBP...50..285S&rft.aulast=Scheel&rft.aufirst=D.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
92. ^ Rodaniche, Arcadio F. (1991). "Notes on the behavior of the Larger Pacific Striped Octopus, an undescribed species of the genus Octopus". Bulletin of Marine Science. 49: 667.
93. ^ Caldwell, Roy L.; Ross, Richard; Rodaniche, Arcadio; Huffard, Christine L. (2015). "Behavior and Body Patterns of the Larger Pacific Striped Octopus". PLOS ONE. 10 (8): e0134152. Bibcode:2015PLoSO..1034152C. doi:10.1371/journal.pone.0134152. ISSN 1932-6203. PMC 4534201. PMID 26266543.
94. ^ Mather, Anderson & Wood (2010), pp. 69, 74–75.
95. ^ Goldman, Jason G. (24 May 2012). "How do octopuses navigate?". Scientific American. 168 (4): 491–497\. doi:10.1007/BF00199609. S2CID 41369931. Retrieved 8 June 2017.491-497&rft.date=2012-05-24&rft_id=info:doi/10.1007/BF00199609&rft_id=https://api.semanticscholar.org/CorpusID:41369931#id-name=S2CID&rft.aulast=Goldman&rft.aufirst=Jason+G.&rft_id=https://blogs.scientificamerican.com/thoughtful-animal/how-do-octopuses-navigate/&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
96. ^ Courage (2013), pp. 45–46.
97. ^ a b Carefoot, Thomas. "Octopuses and Relatives: Feeding, diets and growth". A Snail's Odyssey. Archived from the original on 8 May 2017. Retrieved 13 April 2017.
98. ^ Sampaio, Eduardo; Seco, Martim Costa; Rosa, Rui; Gingins, Simon (18 December 2020). "Octopuses punch fishes during collaborative interspecific hunting events". Ecology. 102 (3). Ecological Society of America/Wiley Publishing: e03266. doi:10.1002/ecy.3266. ISSN 0012-9658. PMID 33338268.
99. ^ a b Wassilieff, Maggy; O'Shea, Steve (2 March 2009). "Octopus and squid – Feeding and predation". Te Ara – the Encyclopedia of New Zealand.
100. ^ Collins, Martin A.; Villanueva, Roger (June 2006). Taxonomy, ecology and behaviour of the cirrate octopods. Oceanography and Marine Biology – an Annual Review. Vol. 44\. pp. 277–322\. doi:10.1201/9781420006391.ch6 (inactive 12 November 2024). ISBN 978-0-8493-7044-1. Retrieved 5 February 2024.277-322&rft.date=2006-06&rft_id=info:doi/10.1201/9781420006391.ch6&rft.isbn=978-0-8493-7044-1&rft.aulast=Collins&rft.aufirst=Martin+A.&rft.au=Villanueva,+Roger&rft_id=https://www.researchgate.net/publication/266220687&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988"> `{{cite book}}`: `|journal=` ignored (help)CS1 maint: DOI inactive as of November 2024 (link)
101. ^ a b Wells (1978), pp. 74–75.
102. ^ Wodinsky, Jerome (1969). "Penetration of the Shell and Feeding on Gastropods by Octopus" (PDF). American Zoologist. 9 (3): 997–1010\. doi:10.1093/icb/9.3.997.997-1010&rft.date=1969&rft_id=info:doi/10.1093/icb/9.3.997&rft.aulast=Wodinsky&rft.aufirst=Jerome&rft_id=https://academic.oup.com/icb/article-pdf/9/3/997/602205/9-3-997.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
103. ^ Carefoot, Thomas. "Octopuses and Relatives: Prey handling and drilling". A Snail's Odyssey. Archived from the original on 6 June 2017. Retrieved 21 April 2017.
104. ^ Johnsen, S.; Balser, E. J.; Fisher, E. C.; Widder, E. A. (1999). "Bioluminescence in the deep-sea cirrate octopod Stauroteuthis syrtensis Verrill (Mollusca: Cephalopoda)" (PDF). The Biological Bulletin. 197 (1): 26–39\. doi:10.2307/1542994. JSTOR 1542994. PMID 28296499. Archived from the original (PDF) on 5 March 2011.26-39&rft.date=1999&rft_id=info:pmid/28296499&rft_id=https://www.jstor.org/stable/1542994#id-name=JSTOR&rft_id=info:doi/10.2307/1542994&rft.aulast=Johnsen&rft.aufirst=S.&rft.au=Balser,+E.+J.&rft.au=Fisher,+E.+C.&rft.au=Widder,+E.+A.&rft_id=http://www.biology.duke.edu/johnsenlab/pdfs/pubs/octopusbiolbull.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
105. ^ a b c Huffard, Christine L. (2006). "Locomotion by Abdopus aculeatus (Cephalopoda: Octopodidae): walking the line between primary and secondary defenses". Journal of Experimental Biology. 209 (Pt 19): 3697–3707\. Bibcode:2006JExpB.209.3697H. doi:10.1242/jeb.02435. PMID 16985187.3697-3707&rft.date=2006&rft_id=info:pmid/16985187&rft_id=info:doi/10.1242/jeb.02435&rft_id=info:bibcode/2006JExpB.209.3697H&rft.aulast=Huffard&rft.aufirst=Christine+L.&rft_id=https://doi.org/10.1242%2Fjeb.02435&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
106. ^ Kassim, I.; Phee, L.; Ng, W. S.; Gong, F.; Dario, P.; Mosse, C. A. (2006). "Locomotion techniques for robotic colonoscopy". IEEE Engineering in Medicine and Biology Magazine. 25 (3): 40–56\. doi:10.1109/MEMB.2006.1636351. PMID 16764431. S2CID 9124611.40-56&rft.date=2006&rft_id=https://api.semanticscholar.org/CorpusID:9124611#id-name=S2CID&rft_id=info:pmid/16764431&rft_id=info:doi/10.1109/MEMB.2006.1636351&rft.aulast=Kassim&rft.aufirst=I.&rft.au=Phee,+L.&rft.au=Ng,+W.+S.&rft.au=Gong,+F.&rft.au=Dario,+P.&rft.au=Mosse,+C.+A.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
107. ^ Huffard, C. L.; Boneka, F.; Full, R. J. (2005). "Underwater Bipedal Locomotion by Octopuses in Disguise". Science. 307 (5717): 1927. doi:10.1126/science.1109616. PMID 15790846. S2CID 21030132.
108. ^ a b Wood, J. B; Anderson, R. C (2004). "Interspecific Evaluation of Octopus Escape Behavior" (PDF). Journal of Applied Animal Welfare Science. 7 (2): 95–106\. CiteSeerX 10.1.1.552.5888. doi:10.1207/s15327604jaws0702_2. PMID 15234886. S2CID 16639444. Retrieved 11 September 2015.95-106&rft.date=2004&rft_id=https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.552.5888#id-name=CiteSeerX&rft_id=https://api.semanticscholar.org/CorpusID:16639444#id-name=S2CID&rft_id=info:pmid/15234886&rft_id=info:doi/10.1207/s15327604jaws0702_2&rft.aulast=Wood&rft.aufirst=J.+B&rft.au=Anderson,+R.+C&rft_id=http://www.thecephalopodpage.org/_pdf/2004Escape.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
109. ^ Mather, Anderson & Wood (2010), p. 183.
110. ^ a b Finn, J. K.; Tregenza, T.; Norman, M. D. (2009). "Defensive tool use in a coconut-carrying octopus". Current Biology. 19 (23): R1069–70. Bibcode:2009CBio...19R1069F. doi:10.1016/j.cub.2009.10.052. PMID 20064403. S2CID 26835945.
111. ^ a b Stewart, Doug (1997). "Armed but not dangerous: Is the octopus really the invertebrate intellect of the sea". National Wildlife. 35 (2).
112. ^ Zarrella, Ilaria; Ponte, Giovanna; Baldascino, Elena; Fiorito, Graziano (2015). "Learning and memory in Octopus vulgaris: a case of biological plasticity". Current Opinion in Neurobiology. 35: 74–79\. doi:10.1016/j.conb.2015.06.012. ISSN 0959-4388. PMID 26186237. S2CID 31682363.74-79&rft.date=2015&rft.issn=0959-4388&rft_id=https://api.semanticscholar.org/CorpusID:31682363#id-name=S2CID&rft_id=info:pmid/26186237&rft_id=info:doi/10.1016/j.conb.2015.06.012&rft.aulast=Zarrella&rft.aufirst=Ilaria&rft.au=Ponte,+Giovanna&rft.au=Baldascino,+Elena&rft.au=Fiorito,+Graziano&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
113. ^ "Octopus intelligence: Jar opening". BBC News. 25 February 2003. Retrieved 4 February 2014.
114. ^ Mather, J. A.; Anderson, R. C. (1998). Wood, J. B. (ed.). "What behavior can we expect of octopuses?". The Cephalopod Page. Archived from the original on 5 October 2017. Retrieved 22 October 2006.
115. ^ Lee, Henry (1875). "V: The octopus out of water". Aquarium Notes – The Octopus; or, the "devil-fish" of fiction and of fact. London: Chapman and Hall. pp. 38–39\. OCLC 1544491. Retrieved 11 September 2015. "The marauding rascal had occasionally issued from the water in his tank, and clambered up the rocks, and over the wall into the next one; there he had helped himself to a young lump-fish, and, having devoured it, returned demurely to his own quarters by the same route, with well-filled stomach and contented mind."38-39&rft.pub=Chapman+and+Hall&rft.date=1875&rft_id=info:oclcnum/1544491&rft.aulast=Lee&rft.aufirst=Henry&rft_id=https://books.google.com/books?id=lD8DAAAAQAAJ&pg;=PA38&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
116. ^ Ainge Roy, Eleanor (14 April 2016). "The great escape: Inky the octopus legs it to freedom from aquarium". The Guardian (Australia).
117. ^ Henriques, Martha (25 July 2022). "The mysterious inner life of the octopus". BBC. Retrieved 29 July 2024.
118. ^ Meyers, Nadia. "Tales from the Cryptic: The Common Atlantic Octopus". Southeastern Regional Taxonomic Centre. Archived from the original on 5 March 2022. Retrieved 27 July 2006.
119. ^ a b Mather, Anderson & Wood (2010), pp. 90–97.
120. ^ Sonner, Sofie C.; Onthank, Kirt L. (2024). "High energetic cost of color change in octopuses". Proceedings of the National Academy of Sciences. 121 (48): e2408386121. Bibcode:2024PNAS..12108386S. doi:10.1073/pnas.2408386121. ISSN 0027-8424. PMC 11621519\. PMID 39556731.
121. ^ Mather, Anderson & Wood (2010), pp. 89–97.
122. ^ Hanlon, R. T.; Messenger, J. B. (2018). Cephalopod Behaviour (2nd ed.). Cambridge University Press. pp. 110–111\. ISBN 978-0-521-72370-1.110-111&rft.edition=2nd&rft.pub=Cambridge+University+Press&rft.date=2018&rft.isbn=978-0-521-72370-1&rft.aulast=Hanlon&rft.aufirst=R.+T.&rft.au=Messenger,+J.+B.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
123. ^ a b Carefoot, Thomas. "Octopuses and Relatives: Predators and Defenses". A Snail's Odyssey. Archived from the original on 21 April 2017. Retrieved 13 April 2017.
124. ^ Mäthger, L. M.; Bell, G. R.; Kuzirian, A. M.; Allen, J. J.; Hanlon, R. T. (2012). "How does the blue-ringed octopus (Hapalochlaena lunulata) flash its blue rings?". Journal of Experimental Biology. 215 (21): 3752–3757\. Bibcode:2012JExpB.215.3752M. doi:10.1242/jeb.076869. PMID 23053367.3752-3757&rft.date=2012&rft_id=info:pmid/23053367&rft_id=info:doi/10.1242/jeb.076869&rft_id=info:bibcode/2012JExpB.215.3752M&rft.aulast=Mäthger&rft.aufirst=L.+M.&rft.au=Bell,+G.+R.&rft.au=Kuzirian,+A.+M.&rft.au=Allen,+J.+J.&rft.au=Hanlon,+R.+T.&rft_id=https://doi.org/10.1242%2Fjeb.076869&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
125. ^ Wigton, Rachel; Wood, James B. "Grass octopus (Octopus macropus)". Marine Invertebrates of Bermuda. Bermuda Institute of Ocean Sciences. Archived from the original on 19 January 2016. Retrieved 10 August 2018.
126. ^ Hanlon, R. T.; Messenger, J. B. (1998). Cephalopod Behaviour (1st ed.). Cambridge University Press. pp. 80–81, 111. ISBN 978-0-521-64583-6.80-81,+111&rft.edition=1st&rft.pub=Cambridge+University+Press&rft.date=1998&rft.isbn=978-0-521-64583-6&rft.aulast=Hanlon&rft.aufirst=R.+T.&rft.au=Messenger,+J.+B.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
127. ^ Caldwell, R. L. (2005). "An Observation of Inking Behavior Protecting Adult Octopus bocki from Predation by Green Turtle (Chelonia mydas) Hatchlings" (PDF). Pacific Science. 59 (1): 69–72\. doi:10.1353/psc.2005.0004. hdl:10125/24161. S2CID 54223984.69-72&rft.date=2005&rft_id=info:hdl/10125/24161&rft_id=https://api.semanticscholar.org/CorpusID:54223984#id-name=S2CID&rft_id=info:doi/10.1353/psc.2005.0004&rft.aulast=Caldwell&rft.aufirst=R.+L.&rft_id=http://scholarspace.manoa.hawaii.edu/bitstream/10125/24161/1/PacSci_069_072.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
128. ^ Harmon, Katherine (27 August 2013). "Even Severed Octopus Arms Have Smart Moves". Octopus Chronicles. Scientific American.
129. ^ Mather, Anderson & Wood (2010), p. 85.
130. ^ Norman, M. D.; Finn, J.; Tregenza, T. (2001). "Dynamic mimicry in an Indo-Malayan octopus" (PDF). Proceedings of the Royal Society. 268 (1478): 1755–8\. doi:10.1098/rspb.2001.1708. PMC 1088805. PMID 11522192. Archived from the original (PDF) on 10 February 2012. Retrieved 1 October 2008.1755-8&rft.date=2001&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088805#id-name=PMC&rft_id=info:pmid/11522192&rft_id=info:doi/10.1098/rspb.2001.1708&rft.aulast=Norman&rft.aufirst=M.+D.&rft.au=Finn,+J.&rft.au=Tregenza,+T.&rft_id=http://marinebio.org/upload/files/mimic.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
131. ^ Norman, M. D. (2005). "The 'Mimic Octopus' (Thaumoctopus mimicus n. gen. et sp.), a new octopus from the tropical Indo-West Pacific (Cephalopoda: Octopodidae)". Molluscan Research. 25 (2): 57–70\. doi:10.11646/mr.25.2.1. S2CID 260016769.57-70&rft.date=2005&rft_id=info:doi/10.11646/mr.25.2.1&rft_id=https://api.semanticscholar.org/CorpusID:260016769#id-name=S2CID&rft.aulast=Norman&rft.aufirst=M.+D.&rft_id=http://www.mapress.com/mr/content/v25/2005f/n2p070.htm&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
132. ^ Pascal, Santiago; Gestal, Camino; Estevez, J.; Arias, Christian Andrés (1996). "Parasites in commercially-exploited cephalopods (Mollusca, Cephalopoda) in Spain: An updated perspective". Aquaculture. 142 (1–2): 1–10\. Bibcode:1996Aquac.142....1P. doi:10.1016/0044-8486(96)01254-9.1–2&rft.pages=1-10&rft.date=1996&rft_id=info:doi/10.1016/0044-8486(96)01254-9&rft_id=info:bibcode/1996Aquac.142....1P&rft.aulast=Pascal&rft.aufirst=Santiago&rft.au=Gestal,+Camino&rft.au=Estevez,+J.&rft.au=Arias,+Christian+Andrés&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
133. ^ Furuya, Hidetaka; Tsuneki, Kazuhiko (2003). "Biology of Dicyemid Mesozoans". Zoological Science. 20 (5): 519–532\. doi:10.2108/zsj.20.519. PMID 12777824. S2CID 29839345.519-532&rft.date=2003&rft_id=https://api.semanticscholar.org/CorpusID:29839345#id-name=S2CID&rft_id=info:pmid/12777824&rft_id=info:doi/10.2108/zsj.20.519&rft.aulast=Furuya&rft.aufirst=Hidetaka&rft.au=Tsuneki,+Kazuhiko&rft_id=https://doi.org/10.2108%2Fzsj.20.519&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
134. ^ Castellanos-Martínez, Sheila; Gestal, Camino (2013). "Pathogens and immune response of cephalopods". Journal of Experimental Marine Biology and Ecology. 447: 14–22\. Bibcode:2013JEMBE.447...14C. doi:10.1016/j.jembe.2013.02.007.14-22&rft.date=2013&rft_id=info:doi/10.1016/j.jembe.2013.02.007&rft_id=info:bibcode/2013JEMBE.447...14C&rft.aulast=Castellanos-Martínez&rft.aufirst=Sheila&rft.au=Gestal,+Camino&rft_id=https://www.academia.edu/6443538&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
135. ^ Farto, R.; Armada, S. P.; Montes, M.; Guisande, J. A.; Pérez, M. J.; Nieto, T. P. (2003). "Vibrio lentus associated with diseased wild octopus (Octopus vulgaris)". Journal of Invertebrate Pathology. 83 (2): 149–156\. Bibcode:2003JInvP..83..149F. doi:10.1016/S0022-2011(03)00067-3. PMID 12788284.149-156&rft.date=2003&rft_id=info:pmid/12788284&rft_id=info:doi/10.1016/S0022-2011(03)00067-3&rft_id=info:bibcode/2003JInvP..83..149F&rft.aulast=Farto&rft.aufirst=R.&rft.au=Armada,+S.+P.&rft.au=Montes,+M.&rft.au=Guisande,+J.+A.&rft.au=Pérez,+M.+J.&rft.au=Nieto,+T.+P.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
136. ^ Gofas, S. (2009). "Octopoda". WoRMS. World Register of Marine Species. Retrieved 5 May 2017.
137. ^ Mather, Anderson & Wood (2010), p. 145.
138. ^ a b Sanchez, Gustavo; Setiamarga, Davin H. E.; Tuanapaya, Surangkana; Tongtherm, Kittichai; Winkelmann, Inger E.; Schmidbaur, Hannah; Umino, Tetsuya; Albertin, Caroline; Allcock, Louise; Perales-Raya, Catalina; Gleadall, Ian; Strugnell, Jan M.; Simakov, Oleg; Nabhitabhata, Jaruwat (2018). "Genus-level phylogeny of cephalopods using molecular markers: current status and problematic areas". PeerJ. 6: e4331. doi:10.7717/peerj.4331. PMC 5813590. PMID 29456885.
139. ^ Fuchs, D.; Ifrim, C.; Stinnesbeck, W. (2008). "A new Palaeoctopus (Cephalopoda: Coleoidea) from the Late Cretaceous of Vallecillo, north-eastern Mexico, and implications for the evolution of Octopoda". Palaeontology. 51 (5): 1129–1139\. Bibcode:2008Palgy..51.1129F. doi:10.1111/j.1475-4983.2008.00797.x.1129-1139&rft.date=2008&rft_id=info:doi/10.1111/j.1475-4983.2008.00797.x&rft_id=info:bibcode/2008Palgy..51.1129F&rft.aulast=Fuchs&rft.aufirst=D.&rft.au=Ifrim,+C.&rft.au=Stinnesbeck,+W.&rft_id=https://doi.org/10.1111%2Fj.1475-4983.2008.00797.x&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
140. ^ a b c Fuchs, Dirk; Iba, Yasuhiro; Heyng, Alexander; Iijima, Masaya; Klug, Christian; Larson, Neal L.; Schweigert, Günter; Brayard, Arnaud (2019). "The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods". Papers in Palaeontology. 6 (1): 31–92\. doi:10.1002/spp2.1254. ISSN 2056-2802. S2CID 198256507.31-92&rft.date=2019&rft_id=https://api.semanticscholar.org/CorpusID:198256507#id-name=S2CID&rft.issn=2056-2802&rft_id=info:doi/10.1002/spp2.1254&rft.aulast=Fuchs&rft.aufirst=Dirk&rft.au=Iba,+Yasuhiro&rft.au=Heyng,+Alexander&rft.au=Iijima,+Masaya&rft.au=Klug,+Christian&rft.au=Larson,+Neal+L.&rft.au=Schweigert,+Günter&rft.au=Brayard,+Arnaud&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
141. ^ a b c Kröger, Björn; Vinther, Jakob; Fuchs, Dirk (2011). "Cephalopod origin and evolution: A congruent picture emerging from fossils, development and molecules". BioEssays. 33 (8): 602–613\. doi:10.1002/bies.201100001. ISSN 0265-9247. PMID 21681989. S2CID 2767810.602-613&rft.date=2011&rft.issn=0265-9247&rft_id=https://api.semanticscholar.org/CorpusID:2767810#id-name=S2CID&rft_id=info:pmid/21681989&rft_id=info:doi/10.1002/bies.201100001&rft.aulast=Kröger&rft.aufirst=Björn&rft.au=Vinther,+Jakob&rft.au=Fuchs,+Dirk&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
142. ^ Fuchs, Dirk; Schweigert, Günter (2018). "First Middle–Late Jurassic gladius vestiges provide new evidence on the detailed origin of incirrate and cirrate octopuses (Coleoidea)". PalZ. 92 (2): 203–217\. Bibcode:2018PalZ...92..203F. doi:10.1007/s12542-017-0399-8. ISSN 0031-0220. S2CID 135245479.203-217&rft.date=2018&rft_id=info:doi/10.1007/s12542-017-0399-8&rft_id=https://api.semanticscholar.org/CorpusID:135245479#id-name=S2CID&rft.issn=0031-0220&rft_id=info:bibcode/2018PalZ...92..203F&rft.aulast=Fuchs&rft.aufirst=Dirk&rft.au=Schweigert,+Günter&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
143. ^ "A Broad Brush History of the Cephalopoda". The Cephalopod Group. Archived from the original on 16 July 2018. Retrieved 27 March 2017.
144. ^ Young, R. E.; Vecchione, M.; Mangold, K. M. (1999). "Cephalopoda Glossary". Tree of Life web project. Retrieved 30 May 2017.
145. ^ Seibel, B. "Vampyroteuthis infernalis, Deep-sea Vampire squid". The Cephalopod Page. Archived from the original on 16 July 2018. Retrieved 31 May 2017.
146. ^ Ibáñez, Christian M.; Fenwick, Mark; Ritchie, Peter A.; Carrasco, Sergio A.; Pardo-Gandarillas, M. Cecilia (2020). "Systematics and Phylogenetic Relationships of New Zealand Benthic Octopuses (Cephalopoda: Octopodoidea)". Frontiers in Marine Science. 7: 182. Bibcode:2020FrMaS...7..182I. doi:10.3389/fmars.2020.00182. ISSN 2296-7745.
147. ^ Courage (2013), pp. 46–49.
148. ^ Liscovitch-Brauer, N.; Alon, S.; Porath, H. T.; Elstein, B.; Unger, R.; Ziv, T.; Admon, A.; Levanon, E. Y.; Rosenthal, J. J. C.; Eisenberg, E. (2017). "Trade-off between transcriptome plasticity and genome evolution in cephalopods". Cell. 169 (2): 191–202\. doi:10.1016/j.cell.2017.03.025. PMC 5499236. PMID 28388405.191-202&rft.date=2017&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499236#id-name=PMC&rft_id=info:pmid/28388405&rft_id=info:doi/10.1016/j.cell.2017.03.025&rft.aulast=Liscovitch-Brauer&rft.aufirst=N.&rft.au=Alon,+S.&rft.au=Porath,+H.+T.&rft.au=Elstein,+B.&rft.au=Unger,+R.&rft.au=Ziv,+T.&rft.au=Admon,+A.&rft.au=Levanon,+E.+Y.&rft.au=Rosenthal,+J.+J.+C.&rft.au=Eisenberg,+E.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499236&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
149. ^ Hogan, C. Michael (22 December 2007). "Knossos fieldnotes". The Modern Antiquarian.
150. ^ Wilk, Stephen R. (2000). Medusa: Solving the Mystery of the Gorgon. Oxford University Press. ISBN 978-0-19-988773-6.
151. ^ Linnaeus, Carl (1735). Systema Naturae. Laurentius Salvius.
152. ^ Smedley, Edward; Rose, Hugh James; Rose, Henry John (1845). Encyclopaedia Metropolitana, Or, Universal Dictionary of Knowledge: Comprising the Twofold Advantage of a Philosophical and an Alphabetical Arrangement, with Appropriate Engravings. B. Fellowes. pp. 255–.
153. ^ Dixon, Roland Burrage (1916). Oceanic. The Mythology of All Races. Vol. 9\. Marshall Jones Company. pp. 2–.
154. ^ Bastian, Adolf (1881). Die heilige Sage der Polynesier: Kosmogonie und Theogonie. Oxford University. Leipzig: F. A. Brockhaus. pp. 107–108.
155. ^ Beckwith, Martha Warren (1981). The Kumulipo: A Hawaiian Creation Chant. University of Hawaii Press. pp. 52–53\. ISBN 978-0-8248-0771-9.52-53&rft.pub=University+of+Hawaii+Press&rft.date=1981&rft.isbn=978-0-8248-0771-9&rft.aulast=Beckwith&rft.aufirst=Martha+Warren&rft_id=https://books.google.com/books?id=7Ir_cgqw_9QC&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
156. ^ Srinivasan, A. (2017). "The Sucker, the Sucker! [Review]" (PDF). London Review of Books. 39 (17): 23–25.23-25&rft.date=2017&rft.aulast=Srinivasan&rft.aufirst=A.&rft_id=https://discovery.ucl.ac.uk/id/eprint/10024715/3/Srinivasan_Octopuses.pdf&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
157. ^ "[Review] The Toilers of the Sea by Victor Hugo & Translated by James Hogarth". Kirkus Reviews. 2002. Retrieved 14 May 2021.
158. ^ Cohen-Vrignaud, Gerard (2012). "On Octopussies, or the Anatomy of Female Power". Differences. 23 (2): 32–61\. doi:10.1215/10407391-1533520.32-61&rft.date=2012&rft_id=info:doi/10.1215/10407391-1533520&rft.aulast=Cohen-Vrignaud&rft.aufirst=Gerard&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
159. ^ Fritze, Sointu; Suojoki, Saara (2000). Forbidden Images: Erotic Art from Japan's Edo Period (in Finnish). Helsingin kaupungin taidemuseo. pp. 23–28\. ISBN 978-951-8965-54-4.23-28&rft.pub=Helsingin+kaupungin+taidemuseo&rft.date=2000&rft.isbn=978-951-8965-54-4&rft.aulast=Fritze&rft.aufirst=Sointu&rft.au=Suojoki,+Saara&rft_id=https://books.google.com/books?id=QRtmAAAACAAJ&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
160. ^ Uhlenbeck, Chris; Winkel, Margarita; Tinios, Ellis; Newland, Amy Reigle (2005). Japanese Erotic Fantasies: Sexual Imagery of the Edo Period. Hotei. p. 161\. ISBN 978-90-74822-66-4.
161. ^ Briel, Holger (2010). "The Roving Eye Meets Traveling Pictures: The Field of Vision and the Global Rise of Adult Manga". In Berninger, Mark; Ecke, Jochen; Haberkorn, Gideon (eds.). Comics As a Nexus of Cultures: Essays on the Interplay of Media, Disciplines. McFarland. p. 203\. ISBN 978-0-7864-3987-4.
162. ^ Myers, Paul Zachary (17 May 2017). "Extraordinary Octopus Illustrations". Pharyngula. Retrieved 18 March 2017.
163. ^ Myers, Paul Zachary (29 October 2006). "Definitely not safe for work". Pharyngula. Retrieved 18 March 2017.
164. ^ Smith, S. (26 February 2010). "Why Mark Zuckerberg Octopus Cartoon Evokes 'Nazi Propaganda,' German Paper Apologizes". iMediaEthics. Retrieved 31 May 2017.
165. ^ "Beatles Songwriting & Recording Database: Abbey Road". www.beatlesinterviews.org. Retrieved 2 April 2024.
166. ^ Ross, Philip (18 February 2014). "8-Foot Octopus Wrestles Diver Off California Coast, Rare Encounter Caught on Camera". International Business Times.
167. ^ Fry, B. G.; Roelants, K.; Norman, J. A. (2009). "Tentacles of Venom: Toxic Protein Convergence in the Kingdom Animalia". Journal of Molecular Evolution. 68 (4): 311–321\. Bibcode:2009JMolE..68..311F. doi:10.1007/s00239-009-9223-8. ISSN 0022-2844. PMID 19294452. S2CID 13354905.311-321&rft.date=2009&rft_id=https://api.semanticscholar.org/CorpusID:13354905#id-name=S2CID&rft_id=info:bibcode/2009JMolE..68..311F&rft.issn=0022-2844&rft_id=info:doi/10.1007/s00239-009-9223-8&rft_id=info:pmid/19294452&rft.aulast=Fry&rft.aufirst=B.+G.&rft.au=Roelants,+K.&rft.au=Norman,+J.+A.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
168. ^ "Blue-ringed Octopuses, Hapalochlaena maculosa". The MarineBio Conservation Society. Archived from the original on 24 May 2012. Retrieved 12 April 2017.
169. ^ Caldwell, Roy. "What makes blue-rings so deadly? Blue-ringed octopus have tetrodotoxin". The Cephalopod Page. Archived from the original on 18 July 2018. Retrieved 12 April 2017.
170. ^ Wells (1978), pp. 68.
171. ^ a b Gillespie, G. E.; Parker, G.; Morrison, J. (1998). "A Review of Octopus Fisheries Biology and British Columbia Octopus Fisheries" (PDF). Canadian Stock Assessment Secretariat.
172. ^ Rocliffe, S.; Harris, A. (2016). "The status of octopus fisheries in the Western Indian Ocean". Retrieved 18 June 2017.
173. ^ Wells, Martin (1983). "Cephalopods do it differently". New Scientist. Vol. 100, no. 1382\. pp. 333–334\. ISSN 0262-4079.333-334&rft.date=1983&rft.issn=0262-4079&rft.aulast=Wells&rft.aufirst=Martin&rft_id=https://books.google.com/books?id=qmQ8V0Htqu0C&pg;=PA333&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">[permanent dead link‍]
174. ^ Sauer, Warwick H. H.; Gleadall, Ian G.; et al. (6 December 2019). "World Octopus Fisheries". Reviews in Fisheries Science & Aquaculture. 29 (3). Taylor & Francis: 279–429\. doi:10.1080/23308249.2019.1680603. hdl:10261/227068. ISSN 2330-8249. S2CID 210266167.279-429&rft.date=2019-12-06&rft_id=info:hdl/10261/227068&rft_id=https://api.semanticscholar.org/CorpusID:210266167#id-name=S2CID&rft.issn=2330-8249&rft_id=info:doi/10.1080/23308249.2019.1680603&rft.aulast=Sauer&rft.aufirst=Warwick+H.+H.&rft.au=Gleadall,+Ian+G.&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
175. ^ "Giant Pacific octopus". Monterey Bay Aquarium. 2017. Archived from the original on 4 July 2018. Retrieved 1 August 2015.
176. ^ Eriksen, L. (10 November 2010). "Live and let dine". The Guardian. Retrieved 15 April 2015.
177. ^ Killingsworth, Silvia (3 October 2014). "Why not eat octopus?". The New Yorker. Retrieved 15 April 2016.
178. ^ Dodgson, Lindsay (11 May 2019). "Here's why eating a live octopus can be deadly". Insider.
179. ^ Ferrier, M. (30 May 2010). "Macho foodies in New York develop a taste for notoriety". The Guardian. Retrieved 15 April 2015.
180. ^ Aristotle (c. 350 BC). Historia animalium. IX, 622a: 2–10. Cited in Borrelli, Luciana; Gherardi, Francesca; Fiorito, Graziano (2006). A catalogue of body patterning in Cephalopoda. Firenze University Press. ISBN 978-88-8453-377-7. Abstract Archived 6 February 2018 at the Wayback Machine
181. ^ Leroi, Armand Marie (2014). The Lagoon: How Aristotle Invented Science. Bloomsbury. pp. 71–72\. ISBN 978-1-4088-3622-4.71-72&rft.pub=Bloomsbury&rft.date=2014&rft.isbn=978-1-4088-3622-4&rft.aulast=Leroi&rft.aufirst=Armand+Marie&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
182. ^ "The Cephalopoda". University of California Museum of Paleontology. Retrieved 27 March 2017.
183. ^ Mann, T. (2012). Spermatophores: Development, Structure, Biochemical Attributes and Role in the Transfer of Spermatozoa. Springer. p. 28\. ISBN 978-3-642-82308-4.
184. ^ Laschi, Cecilia; Cianchetti, Matteo; Mazzolai, Barbara; Margheri, Laura; Follador, Maurizio; Dario, Paolo (2012). "Soft Robot Arm Inspired by the Octopus". Advanced Robotics. 26 (7): 709–727\. doi:10.1163/156855312X626343. ISSN 0169-1864. S2CID 6104200.709-727&rft.date=2012&rft_id=https://api.semanticscholar.org/CorpusID:6104200#id-name=S2CID&rft.issn=0169-1864&rft_id=info:doi/10.1163/156855312X626343&rft.aulast=Laschi&rft.aufirst=Cecilia&rft.au=Cianchetti,+Matteo&rft.au=Mazzolai,+Barbara&rft.au=Margheri,+Laura&rft.au=Follador,+Maurizio&rft.au=Dario,+Paolo&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
185. ^ Godfrey-Smith, Peter (2018). Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness. William Collins. pp. 77–105, 137–157\. ISBN 978-0-00-822629-9.77-105,+137-157&rft.pub=William+Collins&rft.date=2018&rft.isbn=978-0-00-822629-9&rft.aulast=Godfrey-Smith&rft.aufirst=Peter&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
186. ^ Baer, Drake (20 December 2016). "Octopuses Are 'the Closest We Will Come to Meeting an Intelligent Alien'". Science of Us. Retrieved 26 April 2017.
187. ^ Brulliard, Karin (13 April 2016). "Octopus slips out of aquarium tank, crawls across floor, escapes down pipe to ocean". The Washington Post. Retrieved 20 February 2017.
188. ^ "The Animals (Scientific Procedures) Act (Amendment) Order 1993". The National Archives. Retrieved 18 February 2015.
189. ^ "The Animals (Scientific Procedures) Act 1986 Amendment Regulations 2012". The National Archives. Retrieved 18 February 2015.
190. ^ "Directive 2010/63/EU of the European Parliament and of the Council". Official Journal of the European Union. Article 1, 3(b) (see page 276/39). Retrieved 18 February 2015.
191. ^ "PoseiDRONE". The BioRobotics Institute, Scuola Superiore Sant'Anna. Archived from the original on 15 May 2021. Retrieved 14 May 2021.
192. ^ Laschi, Cecilia (2015). "Soft Robotics Research, Challenges, and Innovation Potential, Through Showcases". Soft Robotics. pp. 255–264\. doi:10.1007/978-3-662-44506-8_21. ISBN 978-3-662-44505-1.255-264&rft.date=2015&rft_id=info:doi/10.1007/978-3-662-44506-8_21&rft.isbn=978-3-662-44505-1&rft.aulast=Laschi&rft.aufirst=Cecilia&rfr_id=info:sid/en.wikipedia.org:Octopus" class="Z3988">
193. ^ Burgess, Matt (27 March 2017). "This robotic octopus tentacle isn't creepy at all". Wired.

### Bibliography

[edit]

* Courage, K. H. (2013). Octopus! The Most Mysterious Creature in the Sea. Penguin Group. ISBN 978-0-698-13767-7.
* Mather, J. A.; Anderson, R. C.; Wood, J. B. (2010). Octopus: The Ocean's Intelligent Invertebrate. Timber Press. ISBN 978-1-60469-067-5.
* Ruppert, Edward E.; Fox, Richard S.; Barnes, Robert D. (2004). Invertebrate Zoology. Cengage Learning. ISBN 978-0-03-025982-1.
* Wells, M. J. (1978). Octopus, Physiology and Behaviour of an Advanced Invertebrate. Springer Science+Business Media. ISBN 978-94-017-2470-8.

## External links

[edit]

The Wikibook Dichotomous Key has a page on the topic of: Octopoda

Wikimedia Commons has media related to Octopoda.

* Octopuses – Overview at the Encyclopedia of Life
* Octopoda Archived 29 September 2020 at the Wayback Machine at the Tree of Life Web Project
* "Can We Really Be Friends with an Octopus?" at Hakai Magazine, January 11, 2022

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Principal commercial fishery species groups

Wild|

| Large pelagic fish|

* Mackerel
* Salmon
* Shark
* Swordfish
* Tuna
* albacore
* bigeye
* Atlantic bluefin
* Pacific bluefin
* southern bluefin
* skipjack
* yellowfin

|

Forage fish|

* Anchovy
* Capelin
* Herring
* Ilish
* Menhaden
* Sardines
* Saury
* Shad
* Sprat
* european

Demersal fish|

* Catfish
* Cod
* Atlantic
* Pacific
* Alaska pollock
* Flatfish
* flounder
* halibut
* plaice
* sole
* turbot
* Haddock
* Mullet
* Orange roughy
* Pollock
* Rockfish
* Smelt-whitings
* Toothfish

Freshwater fish|

* Carp
* Sturgeon
* Tilapia
* Trout

Other wild fish|

* Eel
* Whitebait
* more...

Crustaceans|

* Crab
* Krill
* Lobster
* Shrimp
* Prawns
* more...

Molluscs|

* Abalone
* Mussels
* Octopus
* Oysters
* Scallops
* Squid
* more...

Echinoderms|

* Sea cucumbers
* Sea urchin
* more...

Fisheries|

* Cod fisheries
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Farmed|

* Carp
* bighead
* common
* crucian
* grass
* silver
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* Mussels
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* Atlantic
* salmon trout
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* Shrimp
* Tilapia

* Commercial fishing
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* v
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Commercial mollusks

Marine gastropods|

* Abalone
* Periwinkle
* Whelk
* Buccinum undatum
* Bullacta exarata
* Kelletia kelletii
* Kelletia lischkei

Land and freshwater gastropods|

* Helix pomatia
* Cornu aspersum
* Helix aperta
* Cepaea nemoralis
* Otala lactea
* Escargot

Free-swimming marine bivalves|

* Scallop
* Queen scallop
* Pecten maximus
* Pecten jacobaeus
* Argopecten irradians
* Placopecten magellanicus

Infaunal bivalves|

* Clam
* Atlantic surf clam
* Soft-shell clam
* Mercenaria mercenaria
* Austrovenus stutchburyi
* Saxidomus nuttalli
* Arctica islandica
* Cockle
* Geoduck
* Spisula solidissima
* Paphies ventricosa
* Paphies australis
* Tuatua
* Ruditapes largillierti
* Grooved carpet shell

Sessile bivalves|

* Oyster
* Mussel
* Pearl oyster
* Pinctada maxima

Freshwater bivalves|

* Freshwater pearl mussel

Cephalopods|

* Octopus
* Squid
* Cuttlefish

Techniques|

* Heliciculture
* Gathering by hand
* Clam digging
* Dredging
* Oyster farming
* Oyster boats
* Pearl farming
* Pearl diving
* Ama divers
* Trawling

List of fishing topics by subject

* v
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* e

Edible mollusks

Bivalves|

| Clams|

* Atlantic jackknife
* Atlantic surf
* Geoduck
* Grooved carpet shell
* Hard clam
* Horse
* Mactra stultorum
* Blunt gaper
* Ocean quahog
* Pacific razor
* Venus
* California butterclam
* Senilia senilis
* Smooth clam
* Soft-shell
* Triangle shell
* Tuatua
* Japanese littleneck
* Razor clam
* Pod razor
* Ensis (razor genus)
* Paphies

|

Cockles|

* Common
* Blood
* Goolwa
* New Zealand
* Sydney
* Giant Atlantic

Mussels|

* Blue
* Mediterranean
* New Zealand green-lipped
* California
* Brown
* Asian/Philippine green
* Date
* Mytilidae (mussel family)

Oysters|

* Eastern
* Olympia
* Southern mud
* Colchester native
* Pacific
* Portuguese
* Windowpane
* Rock
* Sydney rock
* Ostra chilena/Bluff
* Gillardeau oysters
* Crassostrea ("true oyster" genus)

Scallops|

* Atlantic bay
* Great/king
* New Zealand
* Pecten jacobaeus
* Peruvian calico
* Yesso
* Placopecten magellanicus

Gastropods|

| Abalone|

* White
* Red
* Black
* Green
* Pink
* Blacklip
* Greenlip
* Green ormer
* Pāua (group of four species)
* South African abalone
* Chilean

|

Conches|

* Queen
* Elegant
* Dog

Limpets|

* Black-foot opihi/Hawaiian
* Turtle/talc
* Yellow-foot opihi
* China
* Common European
* Rayed Mediterranean
* Ribbed Mediterranean
* Rustic

Periwinkles|

* Common
* Banded
* Littorina sitkana

Whelks|

* Channeled
* Common
* Kellet's
* Kelletia lischkei
* Knobbed
* Pear whelk
* Lightning

Other snails|

| Sea|

* Mud-flat
* Korean mud
* Chorus giganteus
* Bailer

|

Land|

* Cornu aspersum
* Helix lucorum
* Helix pomatia

Freshwater|

* Apple
* Nerites

Inkfish|

| Cuttlefish|

* Spineless
* Bottletail

|

Octopus|

* Common
* Atlantic white-spotted
* Big blue
* Pacific giant
* Southern red
* Mimic
* Amphioctopus fangsiao

Squid|

* New Zealand arrow
* Japanese flying
* Humboldt
* Neon flying

Chitons|

* Chiton magnificus
* Acanthopleura echinata
* Acanthopleura granulata

Related topics|

* Oyster farming
* Land snail farming
* Gastropod anatomy
* Bivalve anatomy

Category

Taxon identifiers

Octopoda|

* Wikidata: Q40152
* Wikispecies: Octopoda
* ADW: Octopoda
* AFD: Octopoda
* BioLib: 133308
* BOLD: 250
* CoL: BMGV4
* EoL: 2315
* GBIF: 459
* iNaturalist: 47458
* IRMNG: 11705
* ITIS: 82589
* NBN: NHMSYS0021055250
* NCBI: 6638
* NZOR: 95190945-22e3-473b-9072-c303dd315db1
* Open Tree of Life: 478542
* Paleobiology Database: 61473
* Plazi: 897FE4F7-455F-A414-5D83-B2E6D43070BE
* WoRMS: 11718

Authority control databases: National |

* Germany
* United States
* France
* BnF data
* Czech Republic
* Israel

|

*[pl.]: plural
*[c.]: circa
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