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''Stygobromus kenki'' is a rare species of amphipod, a crustacean. Its common names include Kenk's amphipod, Rock Creek groundwater amphipod, and Rock Creek stygobromid.〔(Integrated Taxonomic Information System )〕 This species lives only in Washington, D.C., and Montgomery County, Maryland, in the United States. It can be found only in the Potomac River watershed.〔(USFWS Species Assessment and Listing Priority Assignment Form )〕 Its entire range is less than 40 square miles.〔(NatureServe Explorer )〕 It has only been found at five sites at springs or seeps in the local waterways.〔USFWS. (Kenk's amphipod (''Stygobromus kenki'') Spotlight Species Action Plan. )〕 This species is small, the largest female measuring about 5.5 millimeters in length and the largest male about 3.7. It can only be identified by microscopic examination, which requires that the specimen be killed; therefore, scientists prefer not to attempt identification of these rare amphipods.〔 The species lives in and near water in freshwater habitat. It can be found in detritus and sediment along springs and seeps.〔 The amphipod was first collected in 1967 in Rock Creek Park,〔 where it was discovered by Roman Kenk. J. R. Holsinger then named it after him in 1978.〔〔Holsinger, J. R. (1978). (Systematics of the subterranean amphipod genus ''Stygobromus'' (Crangonyctidae), Part II: Species of the eastern United States. ) Smithsonian Contributions to Zoology Number 266.〕 This species can be found with another endangered amphipod of the same genus, ''Stygobromus hayi''.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stygobromus kenki」の詳細全文を読む スポンサード リンク
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