| Physa
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| Five shells of Physa fontinalis
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| Scientific classification
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| Kingdom:
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Animalia
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| Phylum:
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Mollusca
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| Class:
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Gastropoda
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| Superorder:
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Hygrophila
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| Superfamily:
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Lymnaeoidea
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| Family:
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Physidae
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| Genus:
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Physa
Draparnaud, 1801
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| Type species
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Bulla fontinalis
Linnaeus, 1758
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| Synonyms
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- Laurentiphysa Taylor, 2003 (a junior synonym)
- Limnea (Physa) Draparnaud, 1801
- Physa (Diastropha) Gray, 1840
- Physa (Gyrina) Schumacher, 1817
- Physa (Laurentiphysa) Taylor, 2003 (a junior synonym)
- Physa (Mediterraneophysa) Starobogatov & Budnikova, 1976 (a junior synonym)
- Physa (Physa) Draparnaud, 1801
- Physa (Ussuriphysa) Starobogatov & Prozorova, 1989
- Rivicola Fitzinger, 1833 (Invalid: junior objective synonym of Physa, with the same type species)
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Physa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the subfamily Physinae of the family Physidae.
These snails eat algae, diatoms and detritus.