Puzzle elimia
The puzzle elimia (Elimia varians) is a species of freshwater snail with an operculum, aquatic gastropod mollusc in the family Pleuroceridae. This species is endemic to the Cahaba River system of  Bibb County, Alabama in the United States

References 

Elimia
Gastropods described in 1861
Taxonomy articles created by Polbot
Endemic fauna of Alabama
Endemic molluscs of the United States