Rhynchorhina mauritaniensis, False shark ray

Rhynchorhina mauritaniensis Séret & Naylor, 2016

False shark ray
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Image of Rhynchorhina mauritaniensis (False shark ray)
No image available for this species;
drawing shows typical species in Rhinidae.

Classificatie / Namen Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (haaien en roggen) (sharks and rays) > Rhinopristiformes (Shovelnose rays) > Rhinidae (Wedgefishes)
Etymology: Rhynchorhina: Composite name from Rhynchobatus and Rhina indicating that the new genus exhibits features of both genera - with Rhynchobatus-like body with a rounded snout similar to Rhina; mauritaniensis: Named for the country Mauritania, its type locality,.

Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied Ecologie

marien pelagic-neritic. Tropical; 28°N - 14°N, 18°W - 5°W (Ref. 114953)

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North-East Atlantic: off Mauritania.

Grootte / Gewicht / Leeftijd

Maturiteit: Lm ?  range ? - ? cm
Max length : 224 cm TL mannelijk / geslacht onbekend; (Ref. 109576); 204.0 cm TL (female)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

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 and oblique, 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 to first 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).
Body shape (shape guide): elongated; Cross section: flattened.

Biologie     Verklarende woordenlijst (bv. epibenthic)

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).

Levenscyclus en paargedrag Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven

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Séret, B. and G.J.P. Naylor, 2016. Rhynchorhina mauritaniensis, a new genus and species of wedgefish from the eastern central Atlantic (Elasmobrachii: Batoidea: Rhinidae). Zootaxa 4138(2):291-308. (Ref. 109576)

Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))

  Ernstig bedreigd (CR) (A2d); Date assessed: 03 December 2018

CITES

Appendix II: International trade monitored

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

  Harmless





Gebruik door de mens

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Schattingen op basis van modellen

Fylogenetische diversiteitsindex
(Ref. 82804) 		PD50 = 1.0005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00363 (0.00162 - 0.00814), b=3.11 (2.90 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trofisch niveau
(Ref. 69278) 		3.5   ±0.5 se; based on size and trophs of closest relatives
Kwetsbaarheid van de visserij
(Ref. 59153) 		High to very high vulnerability (72 of 100). 🛈