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Hemigaleidae
The weasel sharks are a family, Hemigaleidae, of ground sharks found from the eastern Atlantic Ocean to the continental Indo-Pacific. They are found in shallow coastal waters to a depth of 100 m (330 ft).
Most species are small, reaching no more than 1.4 m long (4.6 ft), though the snaggletooth shark (''Hemipristis elongatus'') may reach 2.4 m (7.9 ft). They have horizontally oval eyes, small spiracles, and precaudal pits. There are two dorsal fins with the base of the first placed well forward of the pelvic fins. The caudal fin has a strong ventral lobe and undulations on the dorsal lobe margin. They feed on a variety of small bony fishes and invertebrates; at least two species specialize on cephalopods. They are not known to have attacked people.〔
==Genera and species==
There are 8 known species in this family, placed in 4 genera. ''Hemipristis'' is placed in the subfamily Hemipristinae, while ''Chaenogaleus'', ''Hemigaleus'', and ''Paragaleus'' are placed in the subfamily Hemigaleinae.〔Haaramo, M. (2005). (Hemigaleidae - weasel sharks ). ''Mike's Phylogeny Archive''. Retrieved on March 3, 2009.〕
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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