Bythinella

clade Hypsogastropoda Bythinella is a genus of very small freshwater snails, an aquatic gastropod mollusk in the family Amnicolidae (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). These gonochoristic snails are small animals, with a shell length of about 2–4 mm. Amnicola is a close relative, containing North American sna...
Found on http://en.wikipedia.org/wiki/Bythinella
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