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sicklefin weasel shark
The sicklefin weasel shark (''Hemigaleus microstoma'') is an uncommon species of ground shark in the family Hemigaleidae. It is native to southern India, southern China, and parts of Southeast Asia, living in shallow waters down to a depth of . This lightly built shark is characterized by its very short mouth, broad upper teeth with serrations only on the trailing edge, and strongly sickle-shaped fins with obvious white tips on the two dorsal fins. It is light grey or bronze in colour, often with small white blotches on its sides, and reaches a maximum known length of .
Spending most of its time close to the sea floor, the sicklefin weasel shark is a specialist predator of cephalopods. Its reproductive mode is viviparous, in which the unborn young form a placental connection to their mother. Females probably give birth twice a year, with each litter consisting of two to four pups. The sicklefin weasel shark is widely caught by artisanal fisheries and used for meat, fins, and fishmeal; its low natural abundance and reproductive rate mean that it cannot sustain much fishing pressure. Given that fishing activity is intense throughout its range, the International Union for Conservation of Nature (IUCN) has assessed this species as Vulnerable.
==Taxonomy==
Dutch ichthyologist Pieter Bleeker described the sicklefin weasel shark in 1852. He gave it the specific epithet ''microstoma'', from the Greek ''mikros'' ("small") and ''stoma'' ("mouth"), and placed it in a new genus, ''Hemigaleus''. His account was based on two females from Jakarta, Indonesia, measuring long.〔〔 This species was once thought to occur off Australia, but that population is now recognised as a distinct species, ''H. australiensis''.〔 Yuanting Chu's 1960 description of ''Negogaleus brachygnathus'' from Chinese waters is probably of the same species as ''H. microstoma''. Albert William Herre's 1929 description of ''Hemigaleus machlani'' from the Philippines, though lacking in detail, is also consistent with being of this species.〔
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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