Black mudalia
The black mudalia (Elimia melanoides)  is a species of freshwater snail in the family Pleuroceridae. It is endemic to the Black Warrior River system of Alabama in the United States. It was thought to be extinct until it was rediscovered during a 1996 survey. References

Endemic molluscs of the United States
Elimia
Endemic fauna of Alabama
Gastropods described in 1834
Taxa named by Timothy Abbott Conrad
Taxonomy articles created by Polbot