The Shawnee rocksnail (Lithasia obovata) is a member of the Pleuroceridae family of molluscs, which vary in colour from pale yellow to dark brown or black. Members of this family have solid, right-facing shells with the mantle opening facing towards the rear. The spiral operculum, which is the horny or calcareous plate that is attached to the foot and is used to close off the shell when the soft parts of the body are retracted, is typically not circular in shape. The Shawnee rocksnail’s eyes are located on the outer sides of the bases of the tentacles (2).
As in other Lithasia species, female Shawnee rocksnails are typically larger than males. Males of this species do not have external sex organs, and the female lays its eggs through a special egg-laying sinus found on the right-hand-side of the foot (2).