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jackson lake springsnail
The Jackson lake springsnail, scientific name ''Pyrgulopsis robusta'', is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. The shell is high and wide, which is large for this genus. It has 4.5 to 6.25 whorls, and is clear-white with a tan periostracum.
== Taxonomy ==
In 2004, two species (''P. idahoensis'' and ''P. hendersoni'') were reclassified as ''P. robusta'' based on genetic analysis. The species description was amended to capture a broader range in morphology.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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