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False Shark Ray

Rhynchorhina mauritaniensis Séret & Naylor 2016

Diagnostic Description

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This species with a heavy shark-like body is distinguished by the following: head somewhat flattened; snout tip broadly rounded to somewhat quadrangular; tail with a dermal fold along each lower edge; large and falcate dorsal fins 2; caudal fin with distinct upper and lower lobes; conspicuous dermal folds 2 on posterior margin of spiracles; nostrils are very large andoblique, and are separated from each other and from the mouth; anterior nasal flap is small (not extending to inner nostril corner); jaws moderately undulated; with about 66/72 rows of oral teeth arranged in pavement; a row of pointed thorns along each rostral ridge, 2/3 additional thorns may occur on snout tip; a single row of thornlets and thorns in front of orbit extending backward to level of spiracles; a median row of about 36 large, pointed thorns from the nape tofirst dorsal fin and 6 between dorsal fins, median thorns flanked by two other shorter rows on the nape-shoulder area, additional short rows of thorns may be present on the outer shoulders; body covered with small dermal denticles, the crowns with a median posterior cusp, an extension from the median ridge, and short lateral cusp; dorsal side greyish to greenish with numerous white ocelli-like spots; a large black transverse blotch on ventral snout tip (Ref. 109576). Resembles Rhynchobatus lubberti in having a similar colour pattern, but differs in having a more broadly rounded snout (similar to that of the shark-ray Rhina ancylostoma (Ref. 109576).
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Biology

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A benthic species with presumably very restricted distribution range (Ref. 114953). A larger male of 275 cm TL (without the caudal fin) was observed in March 1998 at Agadir (reported not collected by an IMROP fishery observer). Caught by trammel net (Ref. 109576). The species was known from a few specimens caught in shallow water in Banc d'Arguin sandy shoal (Ref. 114953).
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False shark ray

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The false shark ray (Rhynchorhina mauritaniensis) is a species of fish in the Rhynchobatidae family and the only species in the genus Rhynchorhina.[2] This rare ray is only known from shallow coastal Atlantic waters in Banc d’Arguin, Mauritania.[2][3][4]

The upperparts of the false shark ray are greyish or greenish-brown and densely covered in white spots.[3] The largest known reliably measured specimen was 2.24 m (7.3 ft) long, but individuals about 2.75 m (9 ft) have been seen.[2] Overall it resembles the African wedgefish (Rhynchobatus luebberti) found in the same region, but it has a blunt rounded snout somewhat like the shark ray or bowmouth guitarfish (Rhina ancylostoma) of the Indo-Pacific. The genus name Rhynchorhina (Rhyncho+rhina) is a reference to this "mix" of features.[2]

Although long known by the local Imraguen people, the first record confirmed by scientists was in 1998 and it only received its species description in 2016.[2]

Very little is known about the behavior of the false shark ray, but a 2-metre (6.6 ft) female caught in February had ripe ovocytes and shrimp in the stomach, while another had moray eels in the stomach.[2]

References

  1. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  2. ^ a b c d e f Séret, B.; G. Naylor (2016). "Rhynchorhina mauritaniensis, a new genus and species of wedgefish from the eastern central Atlantic (Elasmobranchii: Batoidea: Rhinidae)". Zootaxa. 4138 (2): 291–308. doi:10.11646/zootaxa.4138.2.4. PMID 27470765.
  3. ^ a b Last; White; de Carvalho; Séret; Stehmann; Naylor, eds. (2016). Rays of the World. CSIRO. p. 76. ISBN 9780643109148.
  4. ^ Pollerspöck, J.; N. Straube. "Rhynchorhina mauritaniensis Séret & Naylor, 2016". Shark References. Retrieved 6 July 2017.
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False shark ray: Brief Summary

provided by wikipedia EN

The false shark ray (Rhynchorhina mauritaniensis) is a species of fish in the Rhynchobatidae family and the only species in the genus Rhynchorhina. This rare ray is only known from shallow coastal Atlantic waters in Banc d’Arguin, Mauritania.

The upperparts of the false shark ray are greyish or greenish-brown and densely covered in white spots. The largest known reliably measured specimen was 2.24 m (7.3 ft) long, but individuals about 2.75 m (9 ft) have been seen. Overall it resembles the African wedgefish (Rhynchobatus luebberti) found in the same region, but it has a blunt rounded snout somewhat like the shark ray or bowmouth guitarfish (Rhina ancylostoma) of the Indo-Pacific. The genus name Rhynchorhina (Rhyncho+rhina) is a reference to this "mix" of features.

Although long known by the local Imraguen people, the first record confirmed by scientists was in 1998 and it only received its species description in 2016.

Very little is known about the behavior of the false shark ray, but a 2-metre (6.6 ft) female caught in February had ripe ovocytes and shrimp in the stomach, while another had moray eels in the stomach.

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