Coosa Fiveridge Amblema elliotti. Special concern. Endemic to the eastern reaches of Mobile Basin upstream of the Fall Line. Primarily in riverine habitats. Moderate Conservation Concern.
Threeridge Amblema plicata. Common. Found in Tennessee River drainage, western and lower reaches of Mobile Basin, and some Gulf Coast rivers. Common in many areas of Tennessee drainage, but declining in parts of Mobile Basin and Gulf Coast. May be found in riverine or impounded areas. Important commercial species. Low Conservation Concern.