Tennessee Pigtoe Pleuronaia barnesiana. Local and uncommon. Endemic to Cumberlandian Region. Distributed across northern Alabama. Extant in a few tributaries, but extirpated from Tennessee River proper. Limited to shoal habitats. HIGH CONSERVATION CONCERN.
Slabside Pearlymussel Pleuronaia dolabelloides. Rare. Endemic to Tennessee River system. Only extant populations are in Paint Rock River system and a short reach of Bear Creek, Colbert County. Found in shoal habitats. HIGHEST CONSERVATION CONCERN. US Fish and Wildlife Service Fact Sheet.