Bigmouth rocksnail
The bigmouth rocksnail, scientific name Leptoxis occultata, was a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pleuroceridae. This species was endemic to Alabama in the United States. It is now extinct. References

Leptoxis
Extinct gastropods
Gastropods described in 1922
Taxonomy articles created by Polbot
Endemic fauna of Alabama