Fragile Papershell Leptodea fragilis. Fairly common. Widespread in Tennessee River system and Mobile Basin. Occurs in both riverine and impounded habitats. Lowest Conservation Concern.
Scaleshell Leptodea leptodon. Extirpated. Historically occurred in Tennessee River upstream to Muscle Shoals. Not reported since the river was impounded. Listed as endangered by the U.S. Fish and Wildlife Service.