| Aplexa | |
|---|---|
 | |
| Shells of Aplexa hypnorum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Hygrophila |
| Family: | Physidae |
| Genus: | Aplexa Fleming, 1820 |
| Type species | |
| Bulla hypnorum Linnaeus, 1758 | |
| Synonyms | |
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Aplexa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae.
These small snails are quite distinctive, because they have shells that are sinistral, which means that if you hold the shell such that the spire is pointing up, then the aperture is on the left-hand side.
The shells of Aplexa species have a long and large aperture, a relatively high and pointed spire, and no operculum. The shells are thin and corneous and rather transparent.
Only two species are still extant.
Species in the genus Aplexa include: