| Status | VU |
|---|---|
| Status system | IUCN2.3 |
| Status 2 | G5 |
| Status2 system | TNC |
| Genus | Leptoxis |
| Species | praerosa |
| Authority | (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.