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Danian to Present | status = NT | status_system = IUCN3.1 | status_ref = | image = Heptranchias perlo.jpg | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | superordo = Selachimorpha | ordo = Hexanchiformes | familia = Hexanchidae | genus = ''Heptranchias'' | genus_authority = Rafinesque, 1810 | species = ''H. perlo'' | range_map = Heptranchias perlo distmap.png | range_map_caption = Range of the sharpnose sevengill shark | binomial = ''Heptranchias perlo'' | binomial_authority = (Bonnaterre, 1788) | synonyms = ''Heptranchias angio'' Costa, 1857 ''Heptranchias dakini'' Whitley, 1931 ''Heptranchias deani'' Jordan & Starks, 1901 ''Heptrancus angio'' Costa, 1857 ''Notidanus cinereus pristiurus'' Bellotti, 1878 ''Squalus cinereus'' Gmelin, 1789 ''Squalus perlo'' Bonnaterre, 1788 }} The sharpnose sevengill shark (''Heptranchias perlo'') is a species of shark in the family Hexanchidae, and the only species in the genus ''Heptranchias''. Found almost circumglobally in deep water, it is one of the few species of sharks with seven pairs of gill slits as opposed to the usual five. The other shark species with seven gill slits is the broadnose sevengill shark. Though small, this shark is an active, voracious predator of invertebrates and fishes. When caught, this species is notably aggressive and will attempt to bite. It is of minor commercial importance.〔 ==Taxonomy== The genus name ''Heptranchias'' is from the Greek ''heptra'' meaning "seven arms", and ''agchein'' meaning "throttle", referring to this shark's seven pairs of gill slits. Other common names for this species include one-finned shark, perlon shark, sevengill cow shark, sevengilled Mediterranean shark, sevengilled shark, sharpnose seven-gill shark, snouted sevengill shark and slender sevengill shark.〔Bester, C. (Biological Profiles: Sharpnose Sevengill Shark ). ''Florida Museum of Natural History Ichthyology Department''. Retrieved on February 16, 2009.〕 Some authors believe this species is distinct enough to merit its own family, Heptranchiidae.〔Martin, R.A. (Hexanchiformes: Cow Sharks ). ''ReefQuest Centre for Shark Research''. Retrieved on February 17, 2009.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sharpnose sevengill shark」の詳細全文を読む スポンサード リンク
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