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Longhead catshark
The longhead catshark or smoothbelly catshark (''Apristurus longicephalus'') is a species of catshark, family Scyliorhinidae, with a patchy distribution in the Indo-Pacific from Mozambique to southern Japan to northern Australia. It is found in water between deep. This species grows to long and is characterized by its extremely long and narrow snout, short abdomen, and long anal and caudal fins. In addition, a large area of the anterior ventral portion of its body lacks dermal denticles. The longhead catshark is oviparous and the only known cartilaginous fish that is normally hermaphroditic, with the majority of individuals having both the functional reproductive organs of one sex and the undeveloped reproductive organs of the opposite sex. The IUCN currently lacks the data to assess the conservation status of this species.
==Taxonomy and phylogeny==
The first known specimen of the longhead catshark was captured in Tosa Bay, Kochi Prefecture, Japan, on May 12, 1972. The 38-cm-long specimen was initially thought to be an immature male, but has since been identified as a functionally female hermaphrodite. The new species was described by Kazuhiro Nakaya in a 1975 volume of the scientific journal ''Memoirs of the Faculty of Fisheries, Hokkaido University''.〔 In 1999, Nakaya and Sato grouped this species with the similarly long-snouted longfin catshark (''A. herklotsi'') in the ''A. longicephalus'' species group.〔
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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