| Bithyniidae
| | Bithynia tentaculata, Bithynia kobialkai, Bithynia leachii, Bithynia majorcina | 6 |
| Cassidae
| | Phalium saburon, Phalium granulatum, Semicassis saburon, Semicassis undulata | 8 |
| Hydrobiidae
| | Peringia ulvae, Potamopyrgus antipodarum, Pseudamnicola navasiana, Hydrobia acuta | 65 |
| Littorinidae
| | Littorina littorea, Littorina saxatilis, Littorina neritoides, Littorina obtusata | 12 |
| Ovulidae
| | Neosimnia spelta, Pseudosimnia carnea, Pedicularia sicula, Pseudosimnia adriatica | 9 |
| Pomatiidae
| | Pomatias elegans, Tudorella ferruginea, Tudorella mauretanica, Pomatias canariensis | 9 |