Approximately 974 sq mi / 623,375 acres.
Sumter County AL; Kemper and Lauderdale Counties MS.
Rayed Creekshell, Ovate Clubshell, Alabama Spike (H)
, Delicate Spike (H)
, Orangenacre Mucket (H)
, Southern Hickorynut (H)
(H) = Historic (species historically occurred in the SHU or SRRU but, it has either not been collected in a number of years, and may be considered extirpated, or the species could be present but there aren’t recent records to document its presence).
Ovate Clubshell, Southern Clubshell, Alabama Moccasinshell, Orangenacre Mucket.