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The flat pebblesnail, scientific name ''Lepyrium showalteri'', is a species of freshwater snail, an aquatic gastropod mollusk in the family Lithoglyphidae. This species is endemic to the United States. This snail has been listed as endangered on the United States Fish and Wildlife Service list of endangered species since October 28, 1998.〔U.S. Fish & Wildlife Service. ("Species profile Flat pebblesnail (''Lepyrium showalteri'')" ). Accessed 27 November 2008.〕 ''Lepyrium showalteri'' is the only species in the genus ''Lepyrium''.〔 ''Lepyrium showalteri'' is the type species of the genus ''Lepyrium''.〔 Lepyriidae is a synonym of Lithoglyphinae.〔 == Description == The flat pebblesnail is a small snail in the family Lithoglyphidae; however, the species has a large and distinctive-looking shell. This snail's shell is also distinguished by its depressed spire and expanded, flattened body whorl. The shells are ovate in outline, flattened, and grow to 3.5 to 4.4 mm (0.1 to 0.2 in) high and 4 to 5 mm (0.2 in) wide. The umbilical area is imperforate (no opening), and there are 2 to 3 whorls which rapidly expand.〔 The anatomy of this species was described in detail by Thompson in 1984.〔Thompson F. G. (1984). "North American freshwater snail general of the hydrobiid subfamily Lithoglyphinae". ''Malacologia'' 25(1): (109 )-141.〕 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「Flat pebblesnail」の詳細全文を読む スポンサード リンク
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