Scymnodon ichiharai, Japanese velvet dogfish

Scymnodon ichiharai Yano & Tanaka, 1984

Japanese velvet dogfish
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Scymnodon ichiharai   AquaMaps   Data sources: GBIF OBIS
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Image of Scymnodon ichiharai (Japanese velvet dogfish)
No image available for this species;
drawing shows typical species in Somniosidae.

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

Elasmobranchii (haaien en roggen) (sharks and rays) > Squaliformes (Sleeper and dogfish sharks) > Somniosidae (Sleeper sharks)
Etymology: Scymnodon: scymnus, an ancient name for some kind of shark, derived from a Greek word meaning young animal, cub or whelp; odon (Gr.), tooth, referring to large, triangular cutting teeth on lower jaw of S. ringens (See ETYFish)ichiharai: In honor of marine biologist (specializing in whales) Tadayoshi Ichihara (d. 1981), Tokai University (Tokyo, Japan), who suggested that the authors study this shark (See ETYFish).
Eponymy: Dr Tadayoshi Ichihara (d: 1981) was a scientist at the Whales Research Institute, Tokyo, Japan. [...] (Ref. 128868), visit book page.
More on authors: Yano & Tanaka.

Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied Ecologie

marien bathypelagisch; diepte 400 - 830 m (Ref. 131163). Deep-water

Verspreiding Gebieden | FAO regio's | Ecosystemen | Voorkomen | Verspreidingskaart | Introducties | Faunafri

Indo-West Pacific: Andaman Is., Japan and Taiwan.

Grootte / Gewicht / Leeftijd

Maturiteit: Lm ?  range ? - ? cm
Max length : 101 cm TL mannelijk / geslacht onbekend; (Ref. 131163); 151.1 cm TL (female)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

This large brownish-black deep-water shark is distinguished by the following: body is subcylindrical; head depressed, flat above and broad; short snout; dermal denticles along the trunk with pedicelated crowns, supporting dorsal leaf-like blades, with posterior margin of blade straight, slightly undulated, or serrated; only oblique cusps on the lower jaw teeth, without any symmetrical symphysial tooth and outer margin of main cusp almost erect; first and second dorsal fin with a small exposed spine; narrow paddle-shaped pectoral fin (pectoral fin posterior margin 4.6-6.9 % TL); pelvic fin about equal to the second dorsal fin; deep caudal fin, forked barely, with apex of the upper lobe moderately rounded; no anal fin; eyes and spiracle large; upper teeth much smaller than lower, distinct as small spear-like smooth edges in upper teeth and lower triangular (Ref. 125648, 131163).
Cross section: oval.

Biologie     Verklarende woordenlijst (bv. epibenthic)

The smallest recorded mature male is 89.2 cm TL; smallest juvenile male 49.2 cm TL; a female found pregnant with both uteri containing an undetermined number of fertilised eggs 135,1 cm TL; one immature female 105.5 cm TL and five mature females between 126.0-145.5 cm TL (Ref. 125648). Ovoviviparous (Ref. 205).

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

Distinct pairing with embrace (Ref. 205).

Hoofdreferentie Upload uw referenties | Referenties | Coördinator | Medewerkers

Yano, K and S. Tanaka, 1984. Review of the deep sea squaloid shark genus Scymnodon of Japan, with a description of a new species. Jap. J. Ichthyol. 30(4):341-360. (Ref. 31249)

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

  Kwetsbaar (VU) (A2d); Date assessed: 29 August 2019

CITES

Not Evaluated

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 = 0.6250   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00398 (0.00172 - 0.00922), b=3.13 (2.94 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trofisch niveau (Ref. 69278):  4.2   ±0.7 se; based on size and trophs of closest relatives
Weerstandsvermogen (Ref. 120179):  laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Fec assumed to be <100).
Kwetsbaarheid van de visserij (Ref. 59153):  Very high vulnerability (90 of 100). 🛈