Haddleton Lampmussel Obovaria haddletoni. Extinct. Known from only two specimens from West Fork Choctawhatchee River. Not collected for almost 50 years. EXTINCT.
Southern Hickorynut Obovaria jacksoniana. Special concern. Restricted to the western reaches of the Mobile Basin. Remnant populations are found in some tributaries. Usually occurs in shoal habitats. Moderate Conservation Concern.
Hickorynut Obovaria olivaria. Extirpated. Historically occurred in Tennessee River upstream to Muscle Shoals. Last reported in the late 1970s. EXTIRPATED.
Ring Pink Obovaria retusa. Rare. Restricted to Tennessee River system. Possibly remnant populations are found in tailwaters of Wilson Dam. Usually found in lotic habitats. Listed as endangered by the U.S. Fish and Wildlife Service. HIGHEST CONSERVATION CONCERN.
Round Hickorynut Obovaria subrotunda. Rare. Restricted to Tennessee River system. Remnant populations are found only in Paint Rock River system. Usually found in areas of moderate current. HIGHEST CONSERVATION CONCERN.
Alabama Hickorynut Obovaria unicolor. Restricted to the western reaches of Mobile Basin. Common only in Sipsey River, rare elsewhere. Remnant populations are found in some Tombigbee River tributaries. Usually found in areas with at least some current. HIGH CONSERVATION CONCERN.
