I describe a new, characteristic shell deformity in unionid mussels from several sites in southern New York. The posterior end of the shell is strikingly shortened and distorted in these deformed mussels. Because these misshapen mussels have been seen only in streams with heavily agricultural or residential watersheds and only after 1990, they may be caused by an agricultural or household chemical that has come into recent use.
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1 March 2008
A New Widespread Morphological Deformity in Freshwater Mussels from New York
David L. Strayer
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