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snaggletooth shark
The snaggletooth shark, or fossil shark (''Hemipristis elongata''), is a species of weasel shark, in the family Hemigaleidae, and the only extant member of the genus ''Hemipristis''. It is found in the Indo-West Pacific, including the Red Sea, from southeast Africa to the Philippines, north to China, and south to Australia, at depths of from 1 to 130 m. This shark can be found near the bottom of the water column of coastal areas, but can be found at continental and insular shelves.〔(【引用サイトリンク】url=http://www.fishbase.org/summary/Hemipristis-elongata.html )〕 Its length is up to 240 cm (7.87 ft) .〔 Despite being only vulnerable to extinction, this shark is very rarely seen.
==Anatomy==
The snaggletooth's coloration is light grey or bronze with no prominent markings. As its name suggests, it has sharp, serrated teeth on the upper jaw and hooked teeth on the bottom jaw. The shape of its body is fusiform, allowing it greater speed in the water.〔
Reproduction is a special kind of viviparity, called placental viviparity. This is when the shark carries its live young in a placental-like structure, complete with umbilical cord. The placenta structure is derived from the wall of the embryonic yolk sac that has fused with the uterine wall.
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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