Leptoxis torrefacta

Leptoxis torrefacta, or the squat rocksnail, is a species of freshwater snail in the family Pleuroceridae. This species was endemic to Alabama, the United States, with records from the Coosa River. It is now extinct, presumably as a consequence of the impoundment of the Coosa River mainstem.

Description
The shell measures 15-20 mm in length and 11-13 mm in width.