| Mainstream river snail | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Family: | Pleuroceridae |
| Genus: | Leptoxis |
| Species: | L. praerosa |
| Binomial name | |
| Leptoxis praerosa Say, 1821 | |
The mainstream river snail, also known as the onyx rocksnail, scientific name Leptoxis praerosa, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species is endemic to the United States.
