Scymnodon ichiharai

YANO & TANAKA, 1984


Japanese velvet dogfish
Classification: Elasmobranchii Squaliformes Somniosidae

Reference of the original description
YANO, K. & TANAKA, SHO (1984)
Review of the deep sea squaloid shark genus Scymnodon of Japan, with a description of a new species. Japanese Journal of Ichthyology, 30 (4): 341–369

Image of the original description
Image in copyright.

Synonyms / new combinations and misspellings
Scymnodon ishiharai, Zameus ichiharai

Types
Scymnodon ichiharai
Holotype: NSMT: P 21723; Paratype: BMNH: 1983.11.8.1; FUMT: P 3850; FUMT: P 3849; MSM: 80-273; MSM: 80-274; NSMT: P 21724; TMFE: 76; TMFE: 78; TMFE: 169; TMFE: 288; TMFE: 1138; TMFE: 1275; TMFE: 1875;


Description :


Citation: Scymnodon ichiharai YANO & TANAKA, 1984: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 02/2019

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Scymnodon ichiharai YANO & TANAKA, 1984; Will White, CSIRO, Australia
Common names
eng Japanese velvet dogfish

Short Description
Original diagnosis of White et al. (2014) [21593]: A large species of Scymnodon with dermal denticles along the trunk with pedicelated crowns, supporting dorsal leaf-like blades, with posterior margin of blade straight, slightly undulated, or serrated [vs. posterior margin of dorsal blade strongly tridentate in S. ringens, S. plunketi (Fig. 7b), and S. macracanthus]. Scymnodon ichiharai is further distinguished from S. ringens by possessing only oblique cusps on the lower jaw teeth, without any symmetrical symphysial tooth (vs. lower jaw with a symphysial tooth with an erect main cusp in S. ringens), dermal denticles with three to five longitudinal ridges extending throughout the extension of the blade (vs. dermal denticles with anterior concavity in S. ringens). Scymnodon ichiharai is further distinguished from S. plunketi (Fig. 8) and S. macracanthus by having main cusps of lower teeth less oblique, and outer margin of main cusp almost erect (vs. strongly oblique main cusps on lower teeth, with both inner and outer margins of cusps obliquely positioned in S. plunketi and S. macracanthus). Additionally, S. ichiharai is distinguished from S. plunketi by a slightly more slender pectoral fin (S. ichiharai with pectoral fin posterior margin from 4.6–6.9 % TL vs. 7.6–8.8 % TL in S. plunketi).

Distribution
Northwest Pacific: Suruga Bay and adjacent waters of Japan, off Cheng-gong, Taitung, in southeastern Taiwan [21593]

Biology
Distinct pairing with embrace [17086].

Size / Weight / Age
max. (female): 1511 mm TL [21593]

Habitat
bathypelagic; marine; depth range 500 - 800 m [2894]

Dentition
23 (17–30) ? 0 (0–1) ? 22 (20–28)/14 (13–16) ? 0 (0–1) ? 15 (13–15); total 45 (38–58)/29 (27–31) [21593]

Remarks
shark-references Species-ID=6437;