Ganges shark

Species of shark

Ganges shark

Temporal range: Miocene-recent[1]

Conservation status

Critically Endangered (IUCN 3.1)[2]

Scientific classification
Domain:  | Eukaryota
Kingdom:  | Animalia
Phylum:  | Chordata
Class:  | Chondrichthyes
Subclass:  | Elasmobranchii
Subdivision:  | Selachimorpha
Order:  | Carcharhiniformes
Family:  | Carcharhinidae
Genus:  | Glyphis
Species:  |

G. gangeticus

Binomial name
Glyphis gangeticus

(J. P. Müller & Henle, 1839)

Glyphis gangeticus inhabits the Ganges-Hooghly River system
Synonyms

* Carcharhinus gangeticus (Müller & Henle, 1839)
* Carcharias gangeticus (Müller & Henle, 1839)
* Carcharias murrayi (Günther, 1883)
* Eulamia gangetica (Müller & Henle, 1839)
* Platypodon gangeticus (Müller & Henle, 1839)
* Carcharias siamensis (Steindachner, 1896)
* Glyphis siamensis (Steindachner, 1896)
* Glyphis fowlerae (Compagno, W. T. White & Cavanagh, 2010)

The Ganges shark (Glyphis gangeticus) is a critically endangered species of requiem shark found in the Ganges River (Padma River) and the Brahmaputra River of India and Bangladesh. It is often confused with the more common bull shark (Carcharhinus leucas), which also inhabits the Ganges River and is sometimes incorrectly referred to as the Ganges shark.[3] The genus is currently considered to contain three recent species; genetic evidence has shown that both the Borneo river shark (G. fowlerae) and Irrawaddy river shark (G. siamensis) should be regarded as synonyms of the Ganges shark, expanding the range of the species to Pakistan, Myanmar, Borneo, and Java. While the other members of the genus Glyphis occur in coastal marine waters as well as rivers, the Ganges shark is found only in fresh water, making it the world's only exclusively freshwater shark. The species remains poorly known and very rare.

## Taxonomy[edit]

Formerly the Borneo river shark (Glyphis fowlerae) and the Irrawaddy river shark (Glyphis siamensis) were considered to represent two other species in the genus Glyphis. They have recently been reclassified as G. gangeticus based on genetic studies, and their scientific names are treated as synonyms.[4]

The Borneo river shark is known only from the Kinabatangan River in Borneo. It can reach a length of 78 cm (31 in). Only 13 specimens are known to science, all collected in 1996. Expeditions in 2010 and 2011 failed to find any, and while fishermen recognised the shark, they have not been seen for many years.[4]

The Irrawaddy river shark is known only from a single museum specimen originally caught at the mouth of the Irrawaddy River in Myanmar, a brackish-water locality in a large, heavily silt-laden river lined with mangrove forests. It was collected in the 19th century and described as Carcharias siamensis by Austrian ichthyologist Franz Steindachner, in Annalen des Naturhistorischen Museums in Wien (volume 11, 1896).[5] However, subsequent authors doubted the validity of this species, regarding it as an abnormal bull shark (Carcharhinus leucas), until in 2005 shark systematist Leonard Compagno recognized it as distinct member of the genus Glyphis.[6] The specimen is a 60-cm-long immature male. It closely resembles the Ganges shark, but has more vertebrae (209 versus 169) and fewer teeth (29/29 versus 32-37/31-34).[6][7]

A possibly undescribed species of Glyphis is known from Mukah in Borneo, as well as Bangladesh. The status of a Borneo specimen from Sampit remains unclear.[4]

## Physical appearance[edit]

G. gangeticus is a little-known species that is yet to be adequately described.[8] Its size at birth is 56 to 61 cm (22 to 24 in), growing to an estimated 178 cm (70 in) at maturity, with a maximum size of about 204 cm (80 in).[9] The size at birth or maturity is unknown for any other Glyphis species.[6]

A typical requiem shark in its external appearance, it is stocky, with two spineless dorsal fins and an anal fin. The first dorsal fin originates over the last third of the pectoral fins, with a free rear tip that is well in front of the pelvic fins. The second dorsal fin is relatively large, but much smaller than the first (about half the height). The anal fin is slightly smaller than the second dorsal fin and the pectoral fins are broad. A longitudinal upper precaudal pit is seen, but no interdorsal ridge. It is uniformly grey to brownish in color, with no discernible markings.[3]

Its snout is broadly rounded and much shorter than the width of its mouth. The mouth is long, broad, and extends back and up towards the eyes.[3]

Its eyes are minute, suggesting that it may be adapted to turbid water with poor visibility, such as occurs in the Ganges River and the Bay of Bengal. It has internal nictitating eyelids.[3]

The upper teeth have high, broad, serrated, triangular cusps and the labial furrows are very short. The lower front teeth have long, hooked, protruding cusps with unserrated cutting edges along the entire cusp, but without spear-like tips and with low cusplets on feet of crowns. The tooth row counts are 32–37/31–34.[10]

### Diagnostic features[edit]

G. gangeticus can be identified by the first few lower front teeth, which have cutting edges along entire cusp, giving the cusps a claw-like shape, and low cusplets. Also, a second dorsal fin that is about half the height of first dorsal is distinct to this species.[11]

## Distribution[edit]

The Ganges shark, as its name suggests, is largely restricted to the rivers of eastern and northeastern India, particularly the Hooghly River of West Bengal, and the Ganges, Brahmaputra, and Mahanadi in Bihar, Assam, and Odisha, respectively. It is typically found in the middle to lower reaches of a river.[12] One found in 2018 in a Mumbai fish market may have come from somewhere along the banks of the Arabian Sea.[13]

In theory, G. gangeticus could occur in shallow marine estuaries; however, no marine records of the species have been verified to date. Originally, the species was assigned a wide range in the Indo-West Pacific, but this was found to be mostly based on other species of requiem sharks, particularly members of the genus Carcharhinus.[9]

Most literature records and specimens labelled as this species are in fact bull sharks (Carcharhinus leucas) or other carcharhinid species. An extensive 10-year search produced only a few specimens, caught in 1996 in the Ganges River.[14]

## Habitat and ecology[edit]

G. gangeticus is known to inhabit only freshwater, inshore marine, and estuarine systems in the lower reaches of the Ganges-Hooghly River system. Their feeding habits are mostly unknown. The shark's small eyes and slender teeth suggest that it is primarily a fish-eater and is adapted to turbid water.[3] With such limited visibility typical of many tropical rivers and estuaries, other senses − such as hearing, smell, and electroreception − are likely used for predation.[6] Because its eyes are tilted towards its back rather than to the sides or bottom (as is the case in most carcharhinids), the shark may swim along the bottom and scan the water above it for potential prey back-lit by the sun.[10] However, in the Bay of Bengal, G. gangeticus was found to feed heavily on dasyatid stingrays, which spend much of their time on the bottom.[15]

### Reproduction[edit]

It is probably viviparous, with a yolk-sac placenta (speculation through analogy to related species of carcharhinids). The litter size and gestation period are unknown.[3] However, their life history cycle is probably similar to other river sharks, characterized by long gestation, slow growth, delayed maturity, and small litter size. These factors make the Ganges shark populations vulnerable to even relatively low levels of exploitation, such as sport angling or gill netting.[6]

### Possibility of migration[edit]

Some researchers consider G. gangeticus to be amphidromous, covering more than 100 km (62 mi) in both directions.[16] However, this is not thought to be for breeding, as the case in anadromous and catadromous species.[17] The presence of newborn individuals in the Hooghly River suggests that the young may be born in fresh water.[11]

A specimen photographed in 2011 by natural history journalist Malaka Rodrigo at Negombo fish market in Sri Lanka prompted researcher Rex de Silva to speculate on whether the species could occasionally be carried south of its normal range by ocean currents. However, only the head of the shark appears in the photo. Leading shark expert Leonard Compagno emphasised the need to check the dentition and the dorsal fin proportions to confirm the specimen as G. gangeticus, stating that it could also be one of the four other named species.[18]

### Specimens[edit]

G. gangeticus was originally known only from three 19th-century museum specimens, one each in the National Museum of Natural History in Paris, Natural History Museum, Berlin in Berlin, and the Zoological Survey of India in Calcutta.[19] No records exist between 1867 and 1996, and the 1996 records have not been confirmed as G. gangeticus. A specimen collected 84 km (52 mi) upstream of the mouth of the Hooghly River at Mahishadal in 2001 was identified as G. gangeticus, but on photographs of the jaw only.[10] If Carcharias murrayi (Günter, 1887) can be considered a junior synonym of this species, one was found near Karachi, Pakistan. However, the holotype was apparently lost or misplaced in the British Museum of Natural History.[3]

One female specimen was recorded at Sassoon Docks in Mumbai, India in February 2016, measuring 266 cm (105 in) total length. It was caught in the Arabian Sea.[20]

### Molecular biology[edit]

Glyphis species, like other sharks, exhibit a very slow rate of genetic change. This makes them even more vulnerable to becoming extinct, as they are unable to adapt to the rapid and extreme changes caused by humans to their environment.[6]

As only a few specimens exist, naturally little material available is for genetic sampling. However, two websites list records for G. gangeticus:

The Barcode of Life Data Systems (BOLDS) Stats website[21] lists one record:
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1

The NCBI Taxonomy database has one record of mitochondrial genetic material (1,044 base pairs of linear DNA):
Glyphis gangeticus bio-material GN2669,[22] reported in a 2012 paper on DNA sequencing in shark and ray species.[23]

## Conservation[edit]

G. gangeticus is one of 20 sharks on the International Union for Conservation of Nature and Natural Resources Red List of endangered shark species. The species is currently classified as critically endangered. According to the organisation, fewer than 250 Ganges sharks are believed to exist. The need is urgent for a detailed survey of the shark fisheries of the Bay of Bengal.[2][3]

### Major threats[edit]

River sharks are thought to be particularly vulnerable to habitat changes. The Ganges shark is restricted to a very narrow band of habitat that is heavily affected by human activity. Overfishing, habitat degradation from pollution, increasing river use, and management including the construction of dams and barrages, are the principal threats. Thought to be consumed locally for its meat, the Ganges shark is caught by gillnet, and its oil, along with that of the South Asian river dolphin, is highly sought after as a fish attractant.[24] It is also believed to be part of the Asian shark fin trade.[9] After a sighting in 2006, the species was not seen again for over a decade until one was found at a Mumbai fish market in 2016.[13]

The single Irrawaddy river shark specimen stems from an area of intensive artisanal fishing, mainly gillnetting, but also line and electrofishing. Habitat degradation may pose a further threat to this shark, including water pollution and the clearing of mangrove trees for fuel, construction materials, and other products. The shark may be naturally rare in this area and highly restricted in its range. Despite fishing and scientific surveys in the area, no more Irrawaddy river sharks have been recorded in the 100-plus years since the first.[25]

### Conservation actions[edit]

In 2001, the Indian government banned the landing of all species of chondrichthyan fish in its ports. However, shortly afterwards, this ban was amended to cover only 10 species of chondrichthyans. These, including G. gangeticus, are protected under Schedule I, Part II A of the Wildlife Protection Act of India.[26][27] Doubt exists about the effectiveness of this measure, however, because of difficulties in enforcement. A widespread, albeit widely dispersed, artisanal fishery exists for both local consumption and international trade. Compagno (1997) recommends an in-depth survey of fishing camps and landing sites, along with a sampling program in the Ganges system to determine the current status of this shark along with other Gangetic elasmobranchs such as stingrays and sawfish.[2]

## Human interaction[edit]

The Ganges shark is widely feared as a ferocious man-eater,[28] but most of the attacks attributed to it are probably the result of confusion with the bull shark Carcharhinus leucas.[10] This is likely because bull sharks are known to travel long distances into freshwater systems and may co-exist in the same waters as the Ganges shark. Since little is known about the behaviour of genuine freshwater river sharks, and since G. gangeticus is critically endangered, contact with humans is very rare.[29]

The biological differences between the Ganges shark and bull shark also point to a lower likelihood of attacks on humans by the Ganges shark. G. gangeticus has much narrower, higher, upper teeth and slender-cusped, less heavily built lower teeth than C. leucas. Such small sharp teeth are more suitable for fish-impaling, and less useful for dismembering tough mammalian prey than the stout teeth of the bull shark.[11]

## Etymology[edit]

Glyphis: from Greek glyphe, means "carving".[30]

## See also[edit]

* List of sharks
* List of critically endangered fishes

## References[edit]

1. ^ P. E. P, Deraniyagala (1969). "A Miocene vertebrate faunule from the Malu member of Ceylon". Spolia Zeylanica.
2. ^ a b c Rigby, C.L.; Derrick, D.; Dulvy, N.K.; Grant, I; Jabado, R.W. (2021). "Glyphis gangeticus". IUCN Red List of Threatened Species. 2021: e.T169473392A124398647. doi:10.2305/IUCN.UK.2021-2.RLTS.T169473392A124398647.en. Retrieved 10 November 2022.
3. ^ a b c d e f g h Compagno, L. J. V. (1997). "Threatened fishes of the world: Glyphis gangeticus (Muller & Henle, 1839) (Carcharnidae)". Environmental Biology of Fishes. 49 (4): 400. doi:10.1023/a:1007358922066. S2CID 35379347.
4. ^ a b c Li, C.; Corrigan, S.; Yang, L.; Straube, N.; Harris, M.; Hofreiter, M.; White, W.T.; Naylor, G.J.P. (2015). "DNA capture reveals transoceanic gene flow in endangered river sharks". Proceedings of the National Academy of Sciences. 112 (43): 13302–13307. Bibcode:2015PNAS..11213302L. doi:10.1073/pnas.1508735112. PMC 4629339. PMID 26460025.
5. ^ Froese, Rainer; Pauly, Daniel (eds.) (2009). "Glyphis siamensis" in FishBase. November 2009 version.
6. ^ a b c d e f Martin, R. A. "The Mysterious, Endangered River Sharks (Glyphis spp.)". ReefQuest Centre for Shark Research. Retrieved 10 December 2012.
7. ^ Compagno, L.J.V.; M. Dando & S. Fowler (2005). Sharks of the World. Princeton University Press. p. 309-311\. ISBN 978-0-691-12072-0.
8. ^ Martin, R. A. (2005). "Conservation of freshwater and euryhaline elasmobranchs: a review". Journal of the Marine Biological Association of the United Kingdom. 85 (5): 1049–1073. CiteSeerX 10.1.1.533.4292. doi:10.1017/s0025315405012105. S2CID 52833147.
9. ^ a b c Compagno, L. J. V. (2005). 'Ganges shark Glyphis gangeticus'. In: Fowler, S.L., Cavanagh, R.D., Camhi, M., Burgess, G.H., Cailliet, G.M., Fordham, S.V., Simpfendorfer, C.A. and Musick, J.A. (eds). Sharks, rays and chimaeras: the status of the Chondrichthyan fishes. Gland, Switzerland, and Cambridge, UK.: IUCN Species Survival Commission Shark Specialist Group, IUCN. pp. 305–306.
10. ^ a b c d Compagno, L. J. V. (1984). "FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes". FAO Fisheries Synopsis. 125 (4/2): 251–655. Retrieved 6 December 2012.
11. ^ a b c "Glyphis gangeticus". Marine Species Identification Portal. Retrieved 6 December 2012.
12. ^ "Glyphis gangeticus". Carnivora forum. Retrieved 6 December 2012.
13. ^ a b Adamson, Allan (21 April 2018). "Rare River Shark Species Not Seen In A Decade Found On Sale In A Fish Market". Tech Times. Retrieved 22 April 2018.
14. ^ Compagno, L. J. V. (2002). 'Freshwater and estuarine elasmobranch surveys in the Indo-Pacific region: threats, distribution and speciation'. In: S.L. Fowler, T.M. Reed and F.A. Dipper (eds) Elasmobranch Biodiversity, Conservation and Management; Proceedings of the International Seminar and Workshop, Sabah, Malaysia, July 1997. Gland, Switzerland and Cambridge, UK: IUCN SSC Shark Specialist Group.
15. ^ Roberts, T. R. (2005). 'Debunking the mythology of the so-called freshwater shark of the Ganges. Glyphis gangeticus (Elasmobranchii, Carcharhinidae)'. In: 7th Indo-Pacific Fish Conference. Howard International Hotel, Taipei, Taiwan. Academica Sinica, Taipei, Taiwan. Taipei, Taiwan: Ichythological Society of Taiwan.
16. ^ Hărșan, R.; Petrescu-Mag, I. V. (2008). "Endangered fish species of the world – a review". AACL Bioflux. 1 (2): 193–216.
17. ^ Riede, K. (2004). 2004 Global register of migratory species - from global to regional scales. Final Report of the R&D-Projekt 808 05 081. Bonn, Germany: Federal Agency for Nature Conservation. p. 329.
18. ^ de Silva, Rex I. (May–August 2011). "Does the Ganges shark Glyphis gangeticus stray to Sri Lanka?". Bombay Natural History Society. 108 (2): 136.
19. ^ Baillie, Jonathan; Groombridge, Brian (1996). 1996 IUCN Red List of Threatened Animals. Gland, Switzerland: International Union for Conservation of Nature. ISBN 9782831703350.
20. ^ Jabado, R. W.; Kyne, P.; Nazareth, E.; Sutaria, D. N. (2018). "A rare contemporary record of the Critically Endangered Ganges shark Glyphis gangeticus". Journal of Fish Biology. 92 (5): 1663–1669. doi:10.1111/jfb.13619. ISSN 1095-8649. PMID 29611178.
21. ^ "Glyphis gangeticus". Barcode of Life Data Systems. Retrieved 6 December 2012.
22. ^ "Glyphis gangeticus". NCBI. 31 July 2012. Retrieved 10 December 2012.
23. ^ Naylor, G. J. P.; Caira, J. N.; Jensen, K.; Rosana, A. M.; White, W. T.; Last, P. R. (2012). "A DNA Sequence-Based Approach To the Identification of Shark and Ray Species and Its Implications for Global Elasmobranch Diversity and Parasitology". Bulletin of the American Museum of Natural History. 367: 1–262. doi:10.1206/754.1. hdl:2246/6183. S2CID 83264478.
24. ^ Hoq, M. Enamul; Haroon, A. K. Yousuf; Hussain, M. G., eds. (January 2011). Shark fisheries in the Bay of Bengal, Bangladesh: Status and potentialities (PDF). Dhaka, Bangladesh: Bangladesh Fisheries Research Institute (BFRI). p. 76\. ISBN 978-984-33-3276-9. Retrieved 12 October 2014. `{{cite book}}`: `|work=` ignored (help)
25. ^ Barnett, L.A.K.; K.L. Quaranta; D.A. Ebert; W.T. White & L.J.V. Compagno (2009). "Glyphis siamensis". The IUCN Red List of Threatened Species. 2009: e.T161611A5464198. doi:10.2305/IUCN.UK.2009-2.RLTS.T161611A5464198.en.
26. ^ Schedule I, Part II A, Indian Wildlife Protection Act 1972. Government of India Ministry of Environment and Forests. 2006.
27. ^ S.A. Hussain and Ruchi Badola (ed.). "Aquatic Fauna of Ganga River: Status and Conservation. Ganga Aqualife" (PDF). Conservation Monitoring Centre, Wildlife Institute of India, Dehradun.WII-GACMC (2017) Pp 120,124
28. ^ Coppleson, V. M. (1962). Shark Attack. Sydney, Australia: Angus and Robertson.
29. ^ Courtenay, G.; Smith, D. R.; Gladstone, W. (2012). "Occupational health issues in marine freshwater research". Journal of Occupational Medicine and Toxicology. 7 (4): 4. doi:10.1186/1745-6673-7-4. PMC 3317851. PMID 22429712.
30. ^ "Common names of Glyphis gangeticus". Fish base. Retrieved 10 December 2012.

## External links[edit]

* Fish base. Glyphis gangeticus
* Global Biodiversity Information Facility (GBIF): Glyphis gangeticus
* IUCN SSC Shark Specialist Group
* Glyphis gangeticus (Müller & Henle, 1839). Retrieved through: World Register of Marine Species.

* v
* t
* e

Extant requiem shark species

* Kingdom Animalia
* Phylum Chordata
* Class Chondrichthyes
* Subclass Elasmobranchii
* Subdivision Selachii
* Order Carcharhiniformes

Carcharhinus|

* Blacknose shark (C. acronotus)
* Silvertip shark (C. albimarginatus)
* Bignose shark (C. altimus)
* Graceful shark (C. amblyrhynchoides)
* Grey reef shark (C. amblyrhynchos)
* Pigeye shark (C. amboinensis)
* Borneo shark (C. borneensis)
* Copper shark (C. brachyurus)
* Spinner shark (C. brevipinna)
* Nervous shark (C. cautus)
* Pacific smalltail shark (C. cerdale)
* C. coatesi
* Whitecheek shark (C. dussumieri)
* Silky shark (C. falciformis)
* Creek whaler (C. fitzroyensis)
* Galapagos shark (C. galapagenisis)
* Pondicherry shark (C. hemiodon)
* Finetooth shark (C. isodon)
* Smoothtooth blacktip shark (C. leiodon)
* Bull shark (C. leucas)
* Blacktip shark (C. limbatus)
* Oceanic whitetip shark (C. longimanus)
* Hardnose shark (C. macloti)
* Blacktip reef shark (C. melanopterus)
* Dusky shark (C. obscurus)
* Caribbean reef shark (C. perezi)
* Sandbar shark (C. plumbeus)
* Smalltail shark (C. porosus)
* Blackspot shark (C. sealei)
* Night shark (C. signatus)
* Spot-tail shark (C. sorrah)
* Australian blacktip shark (C. tilstoni)
* C. tjutjot

Galeocerdo|

* Tiger shark (G. cuvier)

Glyphis|

* Borneo river shark (G. fowlerae)
* Ganges shark (G. gangeticus)
* Northern river shark (G. garricki)
* Speartooth shark (G. glyphis)
* Irrawaddy river shark (G. siamensis)

Isogomphodon|

* Daggernose shark (I. oxyrhynchus)

Lamiopsis|

* Broadfin shark (L. temminckii)
* Borneo broadfin shark (L. tephrodes)

Loxodon|

* Sliteye shark (L. macrorhinus)

Nasolamia|

* Whitenose shark (N. velox)

Negaprion|

* Sicklefin lemon shark (N. acutidens)
* Lemon shark (N. brevirostris)

Prionace|

* Blue shark (P. glauca)

Rhizoprionodon|

* Milk shark (R. acutus)
* Brazilian sharpnose shark (R. lalandii)
* Pacific sharpnose shark (R. longurio)
* Grey sharpnose shark (R. oligolinx)
* Caribbean sharpnose shark (R. porosus)
* Australian sharpnose shark (R. taylori)
* Atlantic sharpnose shark (R. terraenovae)

Scoliodon|

* Spadenose shark (S. laticaudus)
* Pacific spadenose shark (S. macrorhynchos)

Triaenodon|

* Whitetip reef shark (T. obesus)

* v
* t
* e

Extant shark species

* Kingdom Animalia
* Phylum Chordata
* Subphylum Vertebrata
* Class Chondrichthyes
* Subclass Elasmobranchii
* Subdivision Selachii

Order Carcharhiniformes (Ground sharks)

| Hemigaleidae
(Weasel sharks)|

| Hemipristis|

* Snaggletooth shark (H. elongata)

|

Chaenogaleus|

* Hooktooth shark (C. macrostoma)

Hemigaleus|

* Australian weasel shark (H. australiensis)
* Sicklefin weasel shark (H. microstoma)

Paragaleus|

* Whitetip weasel shark (P. leucolomatus)
* Atlantic weasel shark (P. pectoralis)
* Slender weasel shark (P. randalli)
* Straight-tooth weasel shark (P. tengi)

Leptochariidae|

| Leptocharias|

* Barbeled houndshark (L. smithii)

|

Proscylliidae
(Finback sharks)|

| Ctenacis|

* Harlequin catshark (C. fehlmanni)

|

Eridacnis|

* Cuban ribbontail catshark (E. barbouri)
* Pygmy ribbontail catshark (E. radcliffei)
* African ribbontail catshark (E. sinuans)

Proscyllium|

* Graceful catshark (P. habereri)
* P. venustum

Pseudotriakidae|

| Gollum|

* Slender smooth-hound (G. attenuatus)

|

Pseudotriakis|

* False catshark (P. microdon)

Sphyrnidae
(Hammerhead sharks)|

| Eusphyra|

* Winghead shark (E. blochii)

|

Sphyrna|

* Scalloped bonnethead (S. corona)
* Whitefin hammerhead (S. couardi)
* Scalloped hammerhead (S. lewini)
* Scoophead (S. media)
* Great hammerhead (S. mokarran)
* Bonnethead (S. tiburo)
* Smalleye hammerhead (S. tudes)
* Smooth hammerhead (S. zygaena)

Triakidae
(Houndsharks)|

| Furgaleus|

* Whiskery shark (F. macki)

|

Galeorhinus|

* School shark (G. galeus)

Gogolia|

* Sailback houndshark (G. filewoodi)

Hemitriakis|

* Deepwater sicklefin hound shark (H. abdita)
* Sicklefin hound shark (H. falcata)
* Japanese topeshark (H. japanica)
* Whitefin topeshark (H. leucoperiptera)
* Ocellate topeshark (Hemitriakis Sp.A)

Hypogaleus|

* Blacktip tope (H. hyugaensis)

Iago|

* Longnose houndshark (I. garricki)
* Bigeye houndshark (I. omanensis)
* Lowfin houndshark (Iago Sp.A)

Mustelus
(Smooth-hounds)|

* M. albipinnis
* Gummy shark (M. antarcticus)
* Starry smooth-hound (M. asterias)
* Gray smooth-hound (M. californicus)
* Dusky smooth-hound (M. canis)
* Sharptooth smooth-hound (M. dorsalis)
* Striped smooth-hound (M. fasciatus)
* Spotless smooth-hound (M. griseus)
* Brown smooth-hound (M. henlei)
* Smalleye smooth-hound (M. higmani)
* Spotted estuary smooth-hound (M. lenticulatus)
* Sicklefin smooth-hound (M. lunulatus)
* Starspotted smooth-hound (M. manazo)
* Speckled smooth-hound (M. mento)
* M. minicanis
* Arabian smooth-hound (M. mosis)
* Common smooth-hound (M. mustelus)
* Narrowfin smooth-hound (M. norrisi)
* Whitespotted smooth-hound (M. palumbes)
* Blackspotted smooth-hound (M. punctulatus)
* M. ravidus
* Narrownose smooth-hound (M. schmitti)
* Gulf smoothhound (M. sinusmexicanus)
* Humpback smooth-hound (M. whitneyi)
* M. widodoi

Scylliogaleus|

* Flapnose houndshark (S. quecketti)

Triakis|

* Sharpfin houndshark (T. acutipinna)
* Spotted houndshark (T. maculata)
* Sharptooth houndshark (T. megalopterus)
* Banded houndshark (T. scyllium)
* Leopard shark (T. semifasciata)

Carcharhinidae|

* Large family listed below

Scyliorhinidae|

* Large family listed below

Family Carcharhinidae (Requiem sharks)

| Carcharhinus|

* Blacknose shark (C. acronotus)
* Silvertip shark (C. albimarginatus)
* Bignose shark (C. altimus)
* Graceful shark (C. amblyrhynchoides)
* Grey reef shark (C. amblyrhynchos)
* Pigeye shark (C. amboinensis)
* Borneo shark (C. borneensis)
* Copper shark (C. brachyurus)
* Spinner shark (C. brevipinna)
* Nervous shark (C. cautus)
* Whitecheek shark (C. dussumieri)
* Silky shark (C. falciformis)
* Creek whaler (C. fitzroyensis)
* Galapagos shark (C. galapagenisis)
* Pondicherry shark (C. hemiodon)
* Finetooth shark (C. isodon)
* Smoothtooth blacktip shark (C. leiodon)
* Bull shark (C. leucas)
* Blacktip shark (C. limbatus)
* Oceanic whitetip shark (C. longimanus)
* Hardnose shark (C. macloti)
* Blacktip reef shark (C. melanopterus)
* Dusky shark (C. obscurus)
* Caribbean reef shark (C. perezii)
* Sandbar shark (C. plumbeus)
* Smalltail shark (C. porosus)
* Blackspot shark (C. sealei)
* Night shark (C. signatus)
* Spottail shark (C. sorrah)
* Australian blacktip shark (C. tilstoni)

|

Galeocerdo|

* Tiger shark (G. cuvier)

Glyphis
(River sharks)|

* Ganges shark (G. gangeticus)
* Northern river shark (G. garricki)
* Speartooth shark (G. glyphis)
* Irrawaddy river shark (G. siamensis)
* Borneo river shark (Glyphis sp. B)

Isogomphodon|

* Daggernose shark (I. oxyrhynchus)

Lamiopsis|

* Broadfin shark (L. temminckii)

Loxodon|

* Sliteye shark (L. macrorhinus)

Nasolamia|

* Whitenose shark (N. velox)

Negaprion|

* Sicklefin lemon shark (N. acutidens)
* Lemon shark (N. brevirostris)

Prionace|

* Blue shark (P. glauca)

Rhizoprionodon|

* Milk shark (R. acutus)
* Brazilian sharpnose shark (R. lalandii)
* Pacific sharpnose shark (R. longurio)
* Grey sharpnose shark (R. oligolinx)
* Caribbean sharpnose shark (R. porosus)
* Australian sharpnose shark (R. taylori)
* Atlantic sharpnose shark (R. terraenovae)

Scoliodon|

* Spadenose shark (S. laticaudus)

Triaenodon|

* Whitetip reef shark (T. obesus)

Family Scyliorhinidae (Catsharks)

| Apristurus|

* Flatnose cat shark (A. acanutus)
* A. albisoma
* A. aphyodes
* Atlantic ghost catshark (A. atlanticus)
* Brown catshark (A. brunneus)
* Hoary catshark (A. canutus)
* Flaccid catshark (A. exsanguis)
* A. fedorovi
* Humpback cat shark (A. gibbosus)
* Longfin catshark (A. herklotsi)
* Smallbelly catshark (A. indicus)
* A. internatus
* Broadnose catshark (A. investigatoris)
* Japanese catshark (A. japonicus)
* Longnose catshark (A. kampae)
* Iceland catshark (A. laurussonii)
* Longhead catshark (A. longicephalus)
* Flathead catshark (A. macrorhynchus)
* Broadmouth cat shark (A. macrostomus)
* Ghost catshark (A. manis)
* Black roughscale catshark (A. melanoasper)
* Smalleye catshark (A. microps)
* Smalldorsal cat shark (A. micropterygeus)
* Largenose catshark (A. nasutus)
* Smallfin catshark (A. parvipinnis)
* A. pinguis
* Spatulasnout catshark (A. platyrhynchus)
* Deepwater catshark (A. profundorum)
* Broadgill catshark (A. riveri)
* Saldanha catshark (A. saldanha)
* Pale catshark (A. sibogae)
* South China catshark (A. sinensis)
* Spongehead catshark (A. spongiceps)
* Panama ghost catshark (A. stenseni)

|

Asymbolus|

* Australian spotted catshark (A. analis)
* A. funebris
* Western spotted catshark (A. occiduus)
* Pale spotted catshark (A. pallidus)
* A. parvus
* A. rubiginosus
* Variegated catshark (A. submaculatus)
* Gulf catshark (A. vincenti)

Atelomycterus|

* A. baliensis
* Banded sand catshark (A. fasciatus)
* Australian marbled catshark (A. macleayi)
* Coral catshark (A. marmoratus)

Aulohalaelurus|

* New Caledonia catshark (A. kanakorum)
* Australian blackspotted catshark (A. labiosus)

Cephaloscyllium|

* Whitefin swellshark (C. albipinnum)
* Circle-blotch pygmy swellshark (C. circulopullum)
* Cook's swellshark (C. cooki)
* Reticulated swellshark (C. fasciatum)
* Formosa swellshark (C. formosanum)
* Australian reticulate swellshark (C. hicosellum)
* Draughtsboard shark (C. isabellum)
* Australian swellshark (C. laticeps)
* Spotted swellshark (C. maculatum)
* Leopard-spotted swellshark (C. pardelotum)
* Painted swellshark (C. pictum)
* Sarawak pygmy swellshark (C. sarawakensis)
* Flagtail swellshark (C. signourum)
* Indian swellshark (C. silasi)
* Speckled swellshark (C. speccum)
* Balloon shark (C. sufflans)
* Blotchy swellshark (C. umbratile)
* Saddled swellshark (C. variegatum)
* Swellshark (C. ventriosum)
* Narrowbar swellshark (C. zebrum)

Cephalurus|

* Lollipop catshark (C. cephalus)

Figaro|

* Australian sawtail catshark (F. boardmani)
* Northern sawtail catshark (F. striatus)

Galeus|

* Antilles catshark (G. antillensis)
* Roughtail catshark (G. arae)
* Atlantic sawtail cat shark (G. atlanticus)
* Longfin sawtail cat shark (G. cadenati)
* Gecko catshark (G. eastmani)
* Slender sawtail catshark (G. gracilis)
* Longnose sawtail cat shark (G. longirostris)
* Blackmouth catshark (G. melastomus)
* Southern sawtail catshark (G. mincaronei)
* Mouse catshark (G. murinus)
* Broadfin sawtail catshark (G. nipponensis)
* Peppered catshark (G. piperatus)
* African sawtail catshark (G. polli)
* G. priapus
* Blacktip sawtail catshark (G. sauteri)
* Dwarf sawtail catshark (G. schultzi)
* Springer's sawtail cat shark (G. springeri)

Halaelurus|

* Arabian catshark (H. alcockii)
* Speckled catshark (H. boesemani)
* Blackspotted catshark (H. buergeri)
* Dusky catshark (H. canescens)
* Broadhead cat shark (H. clevai)
* New Zealand catshark (H. dawsoni)
* Bristly catshark (H. hispidus)
* Spotless catshark (H. immaculatus)
* Lined catshark (H. lineatus)
* Mud catshark (H. lutarius)
* Tiger catshark (H. natalensis)
* Quagga catshark (H. quagga)

Haploblepharus|

* Puffadder shyshark (H. edwardsii)
* Brown shyshark (H. fuscus)
* Natal shyshark (H. kistnasamyi)
* Dark shyshark (H. pictus)

Holohalaelurus|

* H. favus
* H. grennian
* Crying izak (H. melanostigma)
* African spotted catshark (H. punctatus)
* Izak catshark (H. regani)

Parmaturus|

* White-tip catshark (P. albimarginatus)
* White-clasper catshark (P. albipenis)
* Beige catshark (P. bigus)
* Campeche catshark (P. campechiensis)
* Velvet catshark (P. lanatus)
* McMillan's catshark (P. macmillani)
* Blackgill catshark (P. melanobranchus)
* Salamander shark (P. pilosus)
* Filetail catshark (P. xaniurus)
* Shorttail catshark (Parmaturus sp. A)

Pentanchus|

* Onefin catshark (P. profundicolus)

Poroderma|

* Pyjama catshark (P. africanum)
* Leopard catshark (P. pantherinum)

Schroederichthys|

* Narrowmouthed catshark (S. bivius)
* Redspotted catshark (S. chilensis)
* Narrowtail catshark (S. maculatus)
* Lizard catshark (S. saurisqualus)
* Slender catshark (S. tenuis)

Scyliorhinus|

* Polkadot catshark (S. besnardi)
* Boa catshark (S. boa)
* Small-spotted catshark (S. canicula)
* Yellowspotted catshark (S. capensis)
* West African catshark (S. cervigoni)
* Comoro cat shark (S. comoroensis)
* Brownspotted catshark (S. garmani)
* Freckled catshark (S. haeckelii)
* Whitesaddled catshark (S. hesperius)
* Blotched catshark (S. meadi)
* Chain catshark (S. retifer)
* Nursehound (S. stellaris)
* Izu cat shark (S. tokubee)
* Cloudy catshark (S. torazame)
* Dwarf catshark (S. torrei)

Order Echinorhiniformes (Bramble sharks)

| Echinorhinidae|

| Echinorhinus|

* Bramble shark (E. brucus)
* Prickly shark (E. cookei)

|

Order Heterodontiformes (Bullhead sharks)

| Heterodontidae|

| Heterodontus|

* Horn shark (H. francisci)
* Crested bullhead shark (H. galeatus)
* Japanese bullhead shark (H. japonicus)
* Mexican hornshark (H. mexicanus)
* Oman bullhead shark (H. omanensis)
* Port Jackson shark (H. portusjacksoni)
* Galapagos bullhead shark (H. quoyi)
* Whitespotted bullhead shark (H. ramalheira)
* Zebra bullhead shark (H. zebra)

|

Order Hexanchiformes

| Chlamydoselachidae|

| Chlamydoselachus|

* Frilled shark (C. anguineus)
* Southern African frilled shark (C. africana)

|

Hexanchidae
(Cow sharks)|

| Heptranchias|

* Sharpnose sevengill shark (H. perlo)

|

Hexanchus|

* Bluntnose sixgill shark (H. griseus)
* Bigeyed sixgill shark (H. nakamurai)

Notorynchus|

* Broadnose sevengill shark (N. cepedianus)

Order Lamniformes (Mackerel sharks)

| Alopiidae|

| Alopias
(Thresher sharks)|

* Pelagic thresher (A. pelagicus)
* Bigeye thresher (A. superciliosus)
* Common thresher (A. vulpinus)
* Alopias sp. (A. sp.)

|

Cetorhinidae|

| Cetorhinus|

* Basking shark (C. maximus)

|

Lamnidae|

| Carcharodon|

* Great white shark (C. carcharias)

|

Isurus|

* Shortfin mako shark (I. oxyrinchus)
* Longfin mako shark (I. paucus)

Lamna|

* Salmon shark (L. ditropis)
* Porbeagle (L. nasus)

Megachasmidae|

| Megachasma|

* Megamouth shark (M. pelagios)

|

Mitsukurinidae|

| Mitsukurina|

* Goblin shark (M. owstoni)

|

Odontaspididae|

| Carcharias|

* Grey nurse shark (C. taurus)
* Indian sand tiger (C. tricuspidatus)

|

Odontaspis|

* Smalltooth sand tiger (O. ferox)
* Bigeye sand tiger (O. noronhai)

Pseudocarchariidae|

| Pseudocarcharias|

* Crocodile shark (P. kamoharai)

|

Order Orectolobiformes (Carpet sharks)

| Brachaeluridae|

| Brachaelurus|

* Blind shark (B. waddi)

|

Heteroscyllium|

* Bluegrey carpetshark (H. colcloughi)

Ginglymostomatidae
(Nurse sharks)|

| Ginglymostoma|

* Nurse shark (G. cirratum)

|

Nebrius|

* Tawny nurse shark (N. ferrugineus)

Pseudoginglymostoma|

* Short-tail nurse shark (P. brevicaudatum)

Hemiscylliidae
(Bamboo sharks)|

| Chiloscyllium|

* Arabian carpetshark (C. arabicum)
* Burmese bamboo shark (C. burmensis)
* Bluespotted bamboo shark (C. caerulopunctatum)
* Grey bamboo shark (C. griseum)
* Hasselt's bamboo shark (C. hasseltii)
* Slender bamboo shark (C. indicum)
* Whitespotted bamboo shark (C. plagiosum)
* Brownbanded bamboo shark (C. punctatum)

|

Hemiscyllium|

* Indonesian speckled carpetshark (H. freycineti)
* H. galei
* Papuan epaulette shark (H. hallstromi)
* H. henryi
* Epaulette shark (H. ocellatum)
* Hooded carpetshark (H. strahani)
* Speckled carpetshark (H. trispeculare)

Orectolobidae
(Wobbegongs)|

| Eucrossorhinus|

* Tasselled wobbegong (E. dasypogon)

|

Orectolobus|

* Floral banded wobbegong (O. floridus)
* Banded wobbegong (O. halei)
* Western wobbegong (O. hutchinsi)
* Japanese wobbegong (O. japonicus)
* Spotted wobbegong (O. maculatus)
* Ornate wobbegong (O. ornatus)
* Dwarf spotted wobbegong (O. parvimaculatus)
* Network wobbegong (O. reticulatus)
* Northern wobbegong (O. wardi)

Sutorectus|

* Cobbler wobbegong (S. tentaculatus)

Parascylliidae
(Collared carpet sharks)|

| Cirrhoscyllium|

* Barbelthroat carpetshark (C. expolitum)
* Taiwan saddled carpetshark (C. formosanum)
* Saddle carpetshark (C. japonicum)

|

Parascyllium|

* Collared carpetshark (P. collare)
* Rusty carpetshark (P. ferrugineum)
* Ginger carpetshark (P. sparsimaculatum)
* Necklace carpetshark (P. variolatum)

Rhincodontidae|

| Rhincodon|

* Whale shark (R. typus)

|

Stegostomatidae|

| Stegostoma|

* Zebra shark (S. fasciatum)

|

Order Pristiophoriformes (Sawsharks)

| Pristiophoridae|

| Pliotrema|

* Sixgill sawshark (P. warreni)

|

Pristiophorus|

* Longnose sawshark (P. cirratus)
* Tropical sawshark (P. delicatus)
* Japanese sawshark (P. japonicus)
* Shortnose sawshark (P. nudipinnis)
* Bahamas sawshark (P. schroederi)
* Eastern Australian sawshark (Pristiophorus peroniensis)
* Philippine sawshark (Pristiophorus sp. C)
* Dwarf sawshark (Pristiophorus sp. D)

Order Squaliformes

| Centrophoridae
(Gulper sharks)|

| Centrophorus|

* Needle dogfish (C. acus)
* Dwarf gulper shark (C. atromarginatus)
* Gulper shark (C. granulosus)
* Dumb gulper shark (C. harrissoni)
* Blackfin gulper shark (C. isodon)
* Lowfin gulper shark (C. lusitanicus)
* Smallfin gulper shark (C. moluccensis)
* Taiwan gulper shark (C. niaukang)
* Leafscale gulper shark (C. squamosus)
* Mosaic gulper shark (C. tessellatus)
* Little gulper shark (C. uyato)

|

Deania|

* Birdbeak dogfish (D. calcea)
* Rough longnose dogfish (D. hystricosa)
* Arrowhead dogfish (D. profundorum)
* Longsnout dogfish (D. quadrispinosum)

Dalatiidae|

| Euprotomicroides|

* Taillight shark (E. zantedeschia)

|

Heteroscymnoides|

* Longnose pygmy shark (H. marleyi)

Mollisquama|

* Pocket shark (M. parini)

Dalatias|

* Kitefin shark (D. licha)

Isistius|

* Cookiecutter shark (I. brasiliensis)
* South China cookiecutter shark (I. labialis)
* Largetooth cookiecutter shark (I. plutodus)

Euprotomicrus|

* Pygmy shark (E. bispinatus)

Squaliolus|

* Smalleye pygmy shark (S. aliae)
* Spined pygmy shark (S. laticaudus)

Etmopteridae|

| Aculeola|

* Hooktooth dogfish (A. nigra)

|

Centroscyllium|

* Highfin dogfish (C. excelsum)
* Black dogfish (C. fabricii)
* Granular dogfish (C. granulatum)
* Bareskin dogfish (C. kamoharai)
* Combtooth dogfish (C. nigrum)
* Ornate dogfish (C. ornatum)
* Whitefin dogfish (C. ritteri)

Etmopterus
(Lantern sharks)|

* New Zealand lanternshark (E. baxteri)
* Blurred lanternshark (E. bigelowi)
* Shorttail lanternshark (E. brachyurus)
* Lined lanternshark (E. bullisi)
* E. burgessi
* Cylindrical lanternshark (E. carteri)
* Tailspot lanternshark (E. caudistigmus)
* Combtooth lanternshark (E. decacuspidatus)
* Pink lanternshark (E. dianthus)
* E. dislineatus
* Blackmouth lanternshark (E. evansi)
* Pygmy lanternshark (E. fusus)
* Broadbanded lanternshark (E. gracilispinis)
* Southern lanternshark (E. granulosus)
* Caribbean lanternshark (E. hillianus)
* Smalleye lantern shark (E. litvinovi)
* Blackbelly lanternshark (E. lucifer)
* Slendertail lanternshark (E. molleri)
* Dwarf lanternshark (E. perryi)
* African lanternshark (E. polli)
* Great lanternshark (E. princeps)
* False lanternshark (E. pseudosqualiolus)
* Smooth lanternshark (E. pusillus)
* Dense-scale lantern shark (E. pycnolepis)
* West Indian lanternshark (E. robinsi)
* Fringefin lanternshark (E. schultzi)
* Thorny lanternshark (E. sentosus)
* Velvet belly lantern shark (E. spinax)
* Splendid lanternshark (E. splendidus)
* Tasmanian lanternshark (E. tasmaniensis)
* Brown lanternshark (E. unicolor)
* Hawaiian lanternshark (E. villosus)
* Green lanternshark (E. virens)

Miroscyllium|

* Rasptooth dogfish (M. sheikoi)

Trigonognathus|

* Viper dogfish (T. kabeyai)

Oxynotidae
(Rough sharks)|

| Oxynotus|

* Prickly dogfish (O. bruniensis)
* Caribbean roughshark (O. caribbaeus)
* Angular roughshark (O. centrina)
* Japanese roughshark (O. japonicus)
* Sailfin roughshark (O. paradoxus)

|

Somniosidae
(Sleeper sharks)|

| Centroscymnus|

* Portuguese dogfish (C. coelolepis)
* Shortnose velvet dogfish (C. cryptacanthus)
* Roughskin dogfish (C. owstoni)

|

Centroselachus|

* Longnose velvet dogfish (C. crepidater)

Proscymnodon|

* Largespine velvet dogfish (P. macracanthus)
* Plunket shark (P. plunketi)

Scymnodalatias|

* Whitetail dogfish (S. albicauda)
* Azores dogfish (S. garricki)
* Sparsetooth dogfish (S. oligodon)
* Sherwood dogfish (S. sherwoodi)

Scymnodon|

* Smallmouth velvet dogfish (S. obscurus)
* Knifetooth dogfish (S. ringens)

Somniosus|

* Southern sleeper shark (S. antarcticus)
* Frog shark (S. longus )
* Greenland shark (S. microcephalus)
* Pacific sleeper shark (S. pacificus)
* Little sleeper shark (S. rostratus)

Zameus|

* Japanese velvet dogfish (Z. ichiharai)
* Velvet dogfish (Z. squamulosus)

Squalidae
(Dogfish sharks)|

| Cirrhigaleus|

* Roughskin spurdog (C. asper)
* Mandarin dogfish (C. barbifer)

|

Squalus
(Spurdogs)|

* Spiny dogfish (S. acanthias)
* Eastern highfin spurdog (S. albifrons)
* S. acutirostris
* Western highfin spurdog (S. altipinnis)
* Longnose spurdog (S. blainville)
* Fatspine spurdog (S. crassispinus)
* Cuban dogfish (S. cubensis)
* Eastern longnose spurdog (S. grahami)
* Japanese spurdog (S. japonicus)
* Shortnose spurdog (S. megalops)
* Blacktailed spurdog (S. melanurus)
* Shortspine spurdog (S. mitsukurii)
* Bartail spurdog (S. notocaudatus)
* Western longnose spurdog (S. nasutus)
* Cyrano spurdog (S. rancureli)
* Pacific spiny dogfish (S. suckleyi)

Order Squatiniformes (Angel sharks)

| Squatinidae|

| Squatina|

* Sawback angelshark (S. aculeata)
* African angelshark (S. africana)
* Eastern Australian angelshark (Squatina albipunctata)
* Argentine angelshark (S. argentina)
* Chilean angelshark (S. armata)
* Australian angelshark (S. australis)
* Pacific angelshark (S. californica)
* Sand devil (S. dumeril)
* Taiwan angelshark (S. formosa)
* Angular angel shark (S. guggenheim)
* S. heteroptera
* Japanese angelshark (S. japonica)
* Indonesian angelshark (S. legnota)
* Cortez angelshark (S. mexicana)
* Clouded angelshark (S. nebulosa)
* Smoothback angelshark (S. oculata)
* S. punctata
* Western Australian angelshark (Squatina pseudocellata)
* Angelshark (S. squatina)
* Ornate angelshark (S. tergocellata)
* Ocellated angelshark (S. tergocellatoides)

|

Taxon identifiers

Glyphis gangeticus|

* Wikidata: Q1471147
* Wikispecies: Glyphis gangeticus
* ADW: Glyphis_gangeticus
* BOLD: 179821
* CoL: 3GGF5
* EoL: 46559841
* FishBase: 887
* GBIF: 5215563
* iNaturalist: 101508
* IRMNG: 10148545
* ITIS: 160463
* IUCN: 9281
* NCBI: 1213683
* OBIS: 277183
* WoRMS: 277183

Carcharias gangeticus|

* Wikidata: Q107055255
* CoL: R3SD
* GBIF: 6742946
* ITIS: 160465
* WoRMS: 298644

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