Theodoxus
Temporal range:
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| An oblique left side view of a live Theodoxus fluviatilis
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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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| Order:
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Cycloneritida
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| Superfamily:
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Neritoidea
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| Family:
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Neritidae
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| Subfamily:
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Neritinae
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| Genus:
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Theodoxus
Montfort, 1810
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| Type species
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Theodoxus lutetianus Montfort, 1810
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| Synonyms
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- † Brusinaella Andrusov, 1912
- † Calvertia Bourguignat, 1881
- † Meganinnia Davitashvili, 1930 ·
- Nerita (Theodoxus) Montfort, 1810
- Neritina Montfort, 1810
- Neritina (Neritaea) J. R. Roth, 1855
- Neritina (Neritodonta) Brusina, 1884 (junior synonym)
- Neritina (Theodoxia) Bourguignat, 1877 (unjustified emendation)
- Neritina (Theodoxus) Montfort, 1810
- Neritoconus Kobelt, 1871
- Neritodonta Brusina, 1884 (junior synonym)
- Neritonyx Andrusov, 1912
- Ninnia Brusina, 1903
- Neritoglobus Kobelt, 1871
- † Ninniopsis Tomlin, 1930 (original rank)
- † Pettretinia Bourguignat, 1881 (subjective synonym)
- † Saintsimonia Bourguignat, 1881 (subjective synonym)
- Theodoxia Bourguignat, 1877 (Invalid: unjustified emendation of Theodoxus)
- Theodoxis Montfort, 1810 (alternative original spelling, not in use)
- † Theodoxus (Brusinaella) Andrusov, 1912· accepted, alternate representation
- Theodoxus (Calvertia) Bourguignat, 1880· accepted, alternate representation
- Theodoxus (Neritaea) J. R. Roth, 1855· accepted, alternate representation
- † Theodoxus (Neritonyx) Andrusov, 1912· accepted, alternate representation
- † Theodoxus (Ninniopsis) Tomlin, 1930· accepted, alternate representation
- Theodoxus (Theodoxus) Montfort, 1810· accepted, alternate representation
- † Tripaloia Bourguignat, 1881
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Theodoxus is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.