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Dasyatis acutirostra
:''"Sharpnose stingray" may also refer to ''Dasyatis zugei'', ''Himantura gerrardi'', or ''Himantura jenkinsii.
The sharpnose stingray (''Dasyatis acutirostra'') is a little-known species of stingray in the family Dasyatidae, found off southern Japan and in the East China Sea. With a rounded pectoral fin disc and a long, projecting snout, ''D. acutirostra'' resembles (and was historically confused with) the smaller pale-edged stingray (''D. zugei''). A number of characteristics differentiate this species from ''D. zugei'', including larger eyes and the absence of a dorsal fin fold on the tail. The International Union for Conservation of Nature (IUCN) has assessed this species as Near Threatened, as its restricted distribution renders it vulnerable to increases in fishing pressure.
==Taxonomy==
Prior to being scientifically described, ''D. acutirostra'' has been confused for ''D. zugei''; the two species have been confounded by various authors since at least Jordan and Fowler's 1903 review of Japanese elasmobranchs.〔 In 1988, Kiyonori Nishida and Kazuhiro Nakaya published a study of the ''D. zugei'' species complex with a description of ''D. acutirostra'', in the ''Japanese Journal of Ichthyology''. The specific epithet comes from the Latin ''acuti'' ("sharp") and ''rostra'' ("snout"). The type specimen is an adult male across, trawled from the East China Sea.
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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