Trigonognathus kabeyai


Viper dogfish
Classification: Elasmobranchii Squaliformes Etmopteridae

Reference of the original description
MOCHIZUKI, K. & OHE, F. (1990)
Trigonognathus kabeyai, a new genus and species of the squalid sharks from Japan. Japanese Journal of Ichthyology, 36 (4): 385–390, 5 fig.

Image of the original description
Image in copyright.

Synonyms / new combinations and misspellings
Trigonognathus aff. kabeyai, Trigonotodus kabeyai

Trigonognathus kabeyai
Holotype: FUMT: P 21151; Paratype: FUMT: P 21151;

Description :

Citation: Trigonognathus kabeyai MOCHIZUKI & OHE, 1990: In: Database of modern sharks, rays and chimaeras,, World Wide Web electronic publication, Version 02/2021

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Trigonognathus kabeyai MOCHIZUKI & OHE, 1990 © Dr. Nicolas Straube, Curator of Ichthyology & Associate Professor, Department of Natural History, University Museum of Bergen
Common names
eng Triangle-jaw lantern-shark, eng Viper dogfish, eng Viper shark

Short Description
Original diagnosis of MOCHIZUKI & OHE, 1990 [1685]: Two dorsal fins preceded by a spine: middle point of 1st dorsal fin base situated above midway between origins of pectoral and pelvic fins. Both jaws trianglar in shape. Shape of teeth similar in both jaws: unicuspid, slender. canine-like, without any cusplets or serrations, with weak thin fold on labial and lingual sides in anterior ones on both jaws; tooth at symphysis of each jaw longest; the numbers 7-1-7/7-1-7 in holotype, 8-1-8/8-1-8 in para type; inters pace between teeth very wide. Body and head covered by dermal denticles; most of the denticles on body and head roughly rhombic, swollen near central part, with about 10-40 facets on the dorsal surface of its crown. Many small round organs considered to be photophores, about 100 microns in diameter, present mainly on ventral surface of body and head. Preoral snout length very short. No barbels at nostrils. Caudal peduncle without lateral keels, or precaudal pits. Rear tip of pectoral fin rounded.

Northwest Pacific: Wakayama and Tokushima, Japan [1685]. Reported from the Hawaiian Islands [17640]. Source:

Distinct pairing with embrace [17086]. Specimens collected between 330 and 360 m [1685].

Size / Weight / Age
47.0 cm TL (male/unsexed; [3720]); 53.9 cm TL (female); max. published weight: 426 g [3720]; max. published weight: 760.0 g

bathydemersal; marine; depth range 330 - 360 m [1685]

shark-references Species-ID=7269;