Subtribes of the Cusabo included the Ashepoo, Combahee, Coosa (also spelled Coosaw, Cussoe, or Kussoe; not the same people as the earlier Coosa chiefdom of the Mississippian culture in Georgia), Edisto (also spelled Edistow), Escamacu (also St. Helena Indians), Etiwan (also Irwan or Eutaw), Kiawah, Stono, Wando, Wappoo and Wimbee.
The flat pebblesnail has not been found in the Coosa River portion of its range since the construction of the Lay Dam and Logan Martin Dam, and recent survey efforts have failed to locate any surviving populations outside of the Cahaba River drainage.