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Guitarfish

From Wikipedia - Reading time: 8 min

For other species known as guitarfish, see Glaucostegus and Wedgefish.

Guitarfish
Temporal range: Upper Jurassic–Recent [1]
Shovelnose guitarfish, Pseudobatos productus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Order: Rhinopristiformes
Family: Rhinobatidae
J. P. Müller & Henle, 1837
Genera

The guitarfish, also referred to as shovelnose rays, are a family, Rhinobatidae, of rays. The guitarfish are known for an elongated body with a flattened head and trunk and small, ray-like wings. The combined range of the various species is tropical, subtropical, and warm temperate waters worldwide.

Names

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In Australia and New Zealand, guitarfish are commonly referred to as shovelnose rays or shovelnose sharks.[2][3]

Description

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Guitarfish have a body form intermediate between those of sharks and rays. The tail has a typical shark-like form, but in many species, the head has a triangular, or guitar-like shape, rather than the disc-shape formed by fusion with the pectoral fins found in other rays.[4]

Reproduction

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Guitarfish can be ovoviviparous; the embryo matures inside an egg within the mother until it is ready to hatch.[5] This is typical of rays.

Habitat

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Guitarfish are bottom feeders that bury themselves in mud or sand and eat worms, crabs, and clams.[6] Some can tolerate salt, fresh, and brackish water.[7] They generally live close to the beach/coastline or in estuaries.[7] As per the myDiveguide.com Database Maldives is the area with the most recorded Guitarfish encounters. Mainly in the Northern Atolls. The Dive Site with the world wide most recorded Guitarfish Encounters is Maroshi Thila at Shaviyani Atoll Maldives.[8]

Evolution

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Rays, including guitarfish, belong to the ancient lineage of cartilaginous fishes. Fossil denticles (tooth-like scales in the skin) resembling that of today's chondrichthyans date at least as far back as the Ordovician, with the oldest unambiguous fossils of cartilaginous fish dating from the middle Devonian. A clade within this diverse family, the Neoselachii, emerged by the Triassic, with the best-understood neoselachian fossils dating from the Jurassic. This clade is represented today by sharks, sawfish, rays and skates.[9]

Classification

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There are a number of issues in the taxonomy of Rhinobatidae, and many fish that were once in this family have been moved to their own families. Nelson's 2006 Fishes of the World recognized four genera in this family: Aptychotrema, Rhinobatos, Trygonorrhina, and Zapteryx. Of these, Aptychotrema, Trygonorrhina, and Zapteryx have been reclassified in the family Trygonorrhinidae. Several other taxa once placed in the Rhinobatidae, such as Platyrhinoidis and Rhina, have also been moved to their own families. Recently, the genus Glaucostegus has again become recognized as distinct from Rhinobatos, and now comprises its own family, Glaucostegidae.

Rhinobatos has been split in three genera based on genetic and morphological considerations: Rhinobatos, Acroteriobatus and Pseudobatos. Tarsistes is dubious and may be a synonym of Pseudobatos, and other genera formerly included in Rhinobatidae have been moved to Glaucostegidae, Rhinidae and Trygonorrhinidae.[10][11][12]

A 2021 re-evaluation of almost complete and articulated material from the Konservat-Lagerstätten of Bolca in Italy suggested that †"Rhinobatos" dezignii and †"Rhinobatos" primaevus should be excluded from Rhinobatos and assigned to the new genera †Pseudorhinobatos and †Eorhinobatos, respectively.[13]

Conservation

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Illegal trade and fishing of guitarfish, especially the critically endangered Pseudobatos horkelii, for elasmobranch products poses one of the largest threats to this ancient group of animals.[16]

See also

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References

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  1. ^ Froese, Rainer; Pauly, Daniel (eds.). "Family Rhinobatidae". FishBase. February 2011 version.
  2. ^ "Eastern Shovelnose Ray, Aptychotrema rostrata (Shaw & Nodder, 1794)".
  3. ^ "Western Shovelnose Ray (Aptychotrema vincentiana)".
  4. ^ Stevens, J.; Last, P.R. (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 66. ISBN 0-12-547665-5.
  5. ^ "Blackchin Guitarfish". Aquarium La Rochelle. Retrieved 2024-06-11.
  6. ^ "Shovelnose guitarfish, Sandy Seafloor, Fishes, Rhinobatos productus at the Monterey Bay Aquarium". Monterey Bay Aquarium. Monterey Bay Aquarium Foundation. Retrieved 1 May 2015.
  7. ^ a b Sullivan, Taylor. "FLMNH Ichthyology Department: Atlantic Guitarfish". Florida Museum of Natural History. Retrieved 1 May 2015.
  8. ^ "Guitarfish". www.divessi.com. Retrieved 2025-04-02.
  9. ^ http://www.ucmp.berkeley.edu/vertebrates/basalfish/chondrofr.html UCMP Berkeley "Chondrichthyes: Fossil Record"
  10. ^ Peter Last; William White; Marcelo de Carvalho; Bernard Séret; Matthias Stehmann; Gavin Naylor, eds. (2016). Rays of the World. CSIRO. ISBN 9780643109148.
  11. ^ Naylor, G.J.P.; Caira, J.N.; Jensen, K.; Rosana, K.A.M.; Straube, N.; Lakner, C. (2012). Carrier, J.C.; Musick, J.A.; Heithaus, M.R. (eds.). Elasmobranch Phylogeny: A Mitochondrial Estimate Based on 595 Species (2nd ed.). CRC Press, Boca Raton, Florida. pp. 31–56. ISBN 9781439839249. {{cite book}}: |work= ignored (help)
  12. ^ Last, P.R.; Séret, B.; Naylor, G.J.P. (2016). "A new species of guitarfish, Rhinobatos borneensis sp. nov. with a redefinition of the family-level classification in the order Rhinopristiformes (Chondrichthyes: Batoidea)". Zootaxa. 4117 (4): 451–475. doi:10.11646/zootaxa.4117.4.1. PMID 27395187.
  13. ^ a b c Giuseppe Marramà; Giorgio Carnevale; Gavin J. P. Naylor; Massimo Varese; Luca Giusberti; Jürgen Kriwet (2021). "Anatomy, taxonomy and phylogeny of the Eocene guitarfishes from the Bolca Lagerstätten, Italy, provide new insights into the relationships of the Rhinopristiformes (Elasmobranchii: Batomorphii)". Zoological Journal of the Linnean Society. 192 (4): 1090–1110. doi:10.1093/zoolinnean/zlaa125.
  14. ^ a b Last, White & Fahmi 2006 (2006). "Rhinobatos jimbaranensis and R. penggali, two new shovelnose rays (Batoidea: Rhinobatidae) from eastern Indonesia". Cybium. 30 (3): 262ff.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  15. ^ Peter R. Last; Leonard J.V. Compagno; Kazuhiro Nakaya (2004). "Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean". Ichthyological Research. 51 (2): 153–158. doi:10.1007/s10228-004-0211-0. S2CID 32090559.
  16. ^ 10.1016/j.biocon.2021.109119
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