Kingdom Animalia (animals) Eumetazoa (metazoans) Bilateria (bilaterally symmetrical animals) Protostomia (protostomes) Lophotrochozoa Trochozoa Mollusca (clams, snails, squids, and relatives) Class Bivalvia Order Unionoida Family Unionidae Genus Popenaias Species Popenaias buckleyi Species Popenaias popei (texas hornshell)
