Approximately 337 sq mi / 216,010 acres.
Franklin, Marion and Monroe Counties AL; Itawamba and Tishomingo Counties MS.
Rayed Creekshell, Alabama Spike, Orangenacre Mucket, Southern Clubshell, Ovate Clubshell, Delicate Spike (H)
, Alabama Moccasinshell (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