Clubshell Pearly Mussel

Pleurobema clava, the clubshell, club naiad or clubshell pearly mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

This species is endemic to the United States. It is a federally protected endangered species and is listed under Appendix I of the Convention on International Trade in Endangered Species of Wild Flora and Fauna.