Potamilus fragilis

Species of bivalve

Potamilus fragilis, previously Leptodea fragilis, the fragile papershell, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. P. fragilis is one of the fastest-growing unionid species and the most abundant unionid species in Lake Erie. Its light-shelled morphology suggests an adaptation to deep water within lakes.

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