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Elktoe Alasmidonta marginata. Extirpated. Restricted to Tennessee River system. Historically found in main stem and large tributaries across northern Alabama. No records since the early twentieth century. Found in shoal habitats. EXTIRPATED.
Coosa Elktoe Alasmidonta mccordi. Extinct. Known only from one specimen collected from the Coosa River in St. Clair County prior to its impoundment. EXTINCT.
Southern Elktoe Alasmidonta triangulata. Rare. Endemic to Apalachicola Basin. Remnant populations are found in Uchee Creek system in Lee and Russell counties. Usually found in sandy mud substrata. HIGHEST CONSERVATION CONCERN.
Slippershell Mussel Alasmidonta viridis. Rare. Restricted to Tennessee River drainage. Remnant populations are found in a few tributaries. Usually found in small creeks. HIGHEST CONSERVATION CONCERN.