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broadfin sawtail catshark
The broadfin sawtail catshark (''Galeus nipponensis'') is a common species of catshark, part of the family Scyliorhinidae. It is found on or near the bottom at depths of , from southeastern Japan to the East China Sea. A slender species growing to long, this shark is characterized by a fairly long, pointed snout, a series of indistinct, dark saddles along its back and tail, and a prominent crest of enlarged dermal denticles along the dorsal edge of its caudal fin. In addition, adult males have very long claspers that reach past the anal fin. The broadfin sawtail catshark is an opportunistic predator of bony fishes, cephalopods, and crustaceans, with immature and mature sharks being primarily piscivorous. It is oviparous and reproduces year-round. The International Union for Conservation of Nature (IUCN) presently lacks the information to assess the conservation status of this species.
==Taxonomy==
The broadfin sawtail catshark has long been lumped together with the closely similar but smaller gecko catshark (''G. eastmani''), under whose name authors such as Toshiji Kamohara had described it since 1950. This shark was formally described as a new species in a 1975 volume of the scientific journal ''Memoirs of the Faculty of Fisheries, Hokkaido University'' by Kazuhiro Nakaya, who gave it the specific epithet ''nipponensis'' from Nippon (Japan). The type specimen is a long adult male caught off Mimase in Kochi Prefecture, on December 20, 1972. Within the genus, this species is closest in morphology to the longnose sawtail catshark (''G. longirostris'').
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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