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The Utah roundmouth snail, also known as the Utah valvata or desert valvata,〔(''Valvata utahensis'' ). ITIS, accessed 19 November 2008〕 scientific name ''Valvata utahensis'', is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails. This species of snail is endemic to the United States. The common name refers to the State of Utah. == Taxonomy == This species was first described as ''Valvata sincera'' var. ''utahensis'' by Richard Ellsworth Call (1856-1917, U.S.A.) in 1884 from specimens collected at Utah Lake, Utah (the type locality).〔 R. E. Call elevated ''Valvata utahensis'' to species level in 1886〔Call R. E. (1886). "On certain recent, quaternary, and new fresh-water Mollusca". ''Proceeding Davenport Academy of Natural Sciences'' , figure 1-3.〕 and this was confirmed also in revision of the genus by Bryant Walker (1856-1936, U.S.A.) in 1902.〔Walker, B. (March 6, 1902). "A Review of the Carinate Valvatas of the United States". ''The Nautilus'' (15 )(11): (121 )—125.〕 There was established a subspecies ''Valvata utahensis horatii'' Baily & Baily, 1951〔Baily J. L. & Baily R. I. (1951). "Further observations on the Mollusca of the relict lakes in the Great basin". ''The Nautilus'' 65(2): (46 )-53, (page 50 ), (plate IV ), figure 5, 5a.〕 from pleistocene, but Taylor (1966)〔Taylor D. W. (1966). "Summary of North American Blancan nonmarine mollusks". ''Malacologia'' (4(1) ): (1 )-172. (page 132 ).〕 stated, that ''Valvata utahensis horatii'' should be a synonym for ''Valvata utahensis''. 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「Utah roundmouth snail」の詳細全文を読む スポンサード リンク
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