Elimia troostiana
Elimia troostiana, the Mossy Elimia, is a species of freshwater snail with an operculum, aquatic gastropod mollusc in the family Pleuroceridae. This species is endemic to the Mossy Creek district of Jefferson County, Tennessee in the United States, for which it is named. References 

Molluscs of the United States
troostiana
Gastropods described in 1838
Taxonomy articles created by Polbot
Endemic fauna of Tennessee