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''Juga'' is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Semisulcospiridae. These snails are native to the rivers of the northwestern United States and adjacent British Columbia. Several species are endemic to isolated large springs in the American Great Basin. The most abundant and widespread species, ''Juga plicifera'', attains a height of up to 35 mm. It is sculpted with fine spiral ridges and variably developed ribs that frequently disappear in parts of the shell made as the animal matures. == Species == The following species and subspecies are recognized: Subgenus ''Juga'' s.s. * ''Juga hemphilli'' (J. Henderson, 1935) * * ''Juga hemphilli dallesensis'' (J. Henderson, 1935)〔 * * ''Juga hemphilli maupinensis'' (J. Henderson, 1935)〔 * ''Juga plicifera'' (I. Lea, 1838)〔 * ''Juga silicula'' (Gould, 1847)〔 Subgenus ''Calibasis'' * ''Juga acutifilosa'' (Stearns, 1890)〔 * * ''Juga acutifilosa pittensis''〔 * * ''Juga acutifilosa siskiyouensis''〔 * ''Juga occata'' (Hinds, 1844)〔 Subgenus ''Oreobasis'' * ''Juga bulbosa'' (Gould, 1847)〔 * ''Juga interioris'' (Goodrich, 1944)〔 * ''Juga laurae'' (Goodrich, 1944)〔 * ''Juga nigrina'' (I. Lea, 1856)〔 subgenus ? * ''Juga chacei'' (Henderson, 1935)〔(NatureServe ) Explorer, accessed 19 November, 2015.〕 * ''Juga newberryi'' (I. Lea, 1860)〔 * ''Juga orickensis'' (Henderson, 1935)〔 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「Juga」の詳細全文を読む スポンサード リンク
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