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''Heterelmis comalensis'' is a rare species of beetle known by the common name Comal Springs riffle beetle. It is endemic to Texas in the United States, where it occurs in only two springs. It is a federally listed endangered species of the United States. This beetle was described as a new species in 1988. It is about 2 millimeters long. It has nonfunctional wings and cannot fly.〔USFWS. (Final Rule To List Three Aquatic Invertebrates in Comal and Hays Counties, TX, as Endangered. ) ''Federal Register'' December 18, 1997.〕 The beetle lives in Comal Springs in Comal County and San Marcos Springs in Hays County, Texas.〔(''Heterelmis comalensis''. ) The Nature Conservancy.〕 It occurs in shallow water in the gravel substrate and in riffles.〔 It lives alongside other species such as the beetle ''Microcylloepus pusillus''. The main threat to this rare species is the slow loss of the Edwards Aquifer, which has long been tapped for its water. The aquifer feeds the springs in which the beetle lives.〔 Some specimens are kept in captivity at the San Marcos National Fish Hatchery and Technology Center, and some larvae have been produced.〔Fries, J. F. (2003). (Possible reproduction of the Comal Springs riffle beetle (Coleoptera: Elmidae) in captivity. ) ''Entomological News'' 114(1) 7.〕 ==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「Heterelmis comalensis」の詳細全文を読む スポンサード リンク
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