Oxynotus japonicus

Yano & Murofushi, 1985


Japanese roughshark
Classification: Elasmobranchii Squaliformes Oxynotidae

Reference of the original description
Yano, K. & Murofushi, M. (1985)
A new prickly dogfish, Oxynotus japonicus, from Japan. Japanese Journal of Ichthyology, 32(2), 129–136

Image of the original description
Image in copyright.

Types
Oxynotus japonicus
Holotype: HVMSH: 19;


Description :


Citation: Oxynotus japonicus Yano & Murofushi, 1985: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 07/2022

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Oxynotus japonicus YANO & MUROFUSHI, 1985, NMMB-P23359, female, 610 mm TL, fresh © Dr. Hsuan-Ching Ho, National Museum of Marine Biology and Aquarium, Pingtung, Taiwan
Common names
eng Japanese roughshark

Short Description
Length from snout tip to 1st dorsal fin spine 2.1 and to 2nd dorsal spine 1.2 in PL. Spiracle large, oval, its length 1.7 in horizontal diameter of eye. Spine of 1st dorsal fin sloping slightly backward. Length from tip of 1st dorsal spine to apex of 1st dorsal fin 2.6 times vertical height from tip of spine to fin base. Length from tip of 2nd dorsal spine to apex of 2nd dorsal fin 1.9 times vertical height from tip of spine to fin base. Second dorasal base 1.3 in interspace between 1st and 2nd dorsal fins. [3744]

Distribution
Northwest Pacific: Suruga Bay, off Omaezaki, Enshu-nada Sea, Japan [3885], Kueishan Island, northeastern Taiwan [25135]

Records:
1984-1988 6 speciemens by bottom trawl in Suruga Bay (n=5) and off Omaezaki, Enshu-nada Sea (n=1); all female, 50,5 cm - 64,5 cm, 1518-3400 gr weight [3885];
2015 1 speciemens, NMMB-P23359, female, 610 mm TL, Daxi fish market, trawled on the slop near Kueishan Island, northeastern Taiwan, 21 March 2015, ca. 300 m [25135]; Source: www.gbif.org

Biology
Distinct pairing with embrace [17086].

Size / Weight / Age
64,5 cm TL (female/unsexed; [3885])

Habitat
bathydemersal; marine; depth range 225 - 270 m [3744]

Dentition
Teeth dissimilar in upper and lower jaws. Upper jaw with narrow, erect, smooth-edged teeth. Lower jaw with only one series of functional, broad, bladelike, smooth-edged teeth. Dental formula: (16-19)/(5-6)-1-(5-6) (n=4) (13/5-1-5 in holotype). Shapes of teeth on both jaws of females similar to those of male, but numbers of these teeth slightly greater in females than in male. [3885]

Remarks
shark-references Species-ID=4480;