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Diamond darter
The diamond darter (''Crystallaria cincotta'') is a species of freshwater fish of the darter family. It is named for the sparkling light it reflects during nighttime collections.〔(【引用サイトリンク】url= http://wvutoday.wvu.edu/news/page/6507/ )〕 The diamond darter was first described in 2008 and is only the second known member of its genus, which also includes the crystal darter, ''C. asprella''. On July 26, 2013, the United States Fish and Wildlife Service formally designated the diamond darter as an endangered species under the Endangered Species Act of 1973.
==Description==
Diamond darters have 11-13 spines on their dorsal fins, and 11-15 soft rays. However, their anal fins do not have any spines at all, and only 11-13 soft rays. Adults are estimated to be 3-5 in long,〔 with the largest specimen measuring 7.7 cm, roughly 3.0 in.〔
Diamond darters bear a strong resemblance to crystal darters, their relatives. Both fishes are translucent, and have olive-colored patterns on their bodies. Diamond darters differ in that they have a gape equal to or larger than the width of the base of their interpelvic fins,〔 which are shaped like sickles. They also have blotches in front of the eyes that are separate from the orbital rim.〔 The diamond darter has fewer dorsal spines and anal rays than the crystal darter. It also has fewer rows of scales on the cheek (2), and opercle (2).〔
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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