Lithasia shells, four species and four subspecies (left to right, top to bottom: L. geniculata, L. geniculata fuligenosa, L. pinguis, L. obovata, L. salebrosa, L. salebrosa subglobosa, L. salebrosa florentiana). Lithasia is an eastern North American freshwater snail genus inhabiting clean streams. Unfortunately, pollution, silting and habitat modification (canalization, impoundments) are threatening the existence of all of its species.
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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