Other Limpets
Marine
- The keyhole limpets and slit limpets - Fissurellidae
- The hydrothermal vent limpets – Neomphaloidea and Lepetodriloidea
- The nerite limpets – Phenacolepadidae
- The hoof snails - Hipponix and other Hipponicidae
- Slipper snails - Crepidula species, which are sometimes known as slipper limpets
- Opisthobranch limpets such as Tylodina and also Umbraculum
- Air-breathing limpets such as Siphonariidae
- A separate family of marine air-breathing limpets, the Trimusculidae
Freshwater
- The pulmonate river and lake limpets - Ancylidae
Most of the marine limpets have gills, whereas all the freshwater limpets and a few of the marine limpets have a mantle cavity that is adapted to breathe air and function as a lung (and in some cases has been again adapted to absorb oxygen from water) all these various kinds of snail are only very distantly related.
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