Theodoxus é um género de gastrópode da família Neritidae.
Este género contém as seguintes espécies:
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Theodoxus altenai Schütt, 1965
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Theodoxus baeticus (Lamarck, 1822)
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Theodoxus danubialis (Pfeiffer, 1828)
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Theodoxus elongatulus (Morelet, 1845)
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Theodoxus euxinus (Clessin, 1886)
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Theodoxus fluviatilis (Linnaeus, 1758)
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Theodoxus heldreichi (Martens, 1879)
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Theodoxus hispalensis (Martens, 1879)
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Theodoxus meridionalis (Philippi, 1836)
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Theodoxus pallasi Lindholm, 1924
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Theodoxus prevostianus (Pfeiffer, 1828)
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Theodoxus saulcyi (Bourguignat, 1852)
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Theodoxus subthermalis (Bourguignat in Issel, 1865)
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Theodoxus transversalis (Pfeiffer, 1828)
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Theodoxus valentinus(Graells, 1846)
subgênero Neritaea Roth, 1855
subgênero ?
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Theodoxus astrachanicus Starobogatov, 1994
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Theodoxus coronatus (Leach, 1815)
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Theodoxus danasteri (Lindholm, 1908)
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Theodoxus euphraticus (Mousson, 1874)
- Theodoxus karasuna
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Theodoxus macri (Sowerby, 1849
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Theodoxus maresi (Bourguignat, 1864)
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Theodoxus marteli (Pallary, 1920)
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Theodoxus milachevitchi Golikov & Starobogatov, 1966
- Theodoxus mutinensis
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Theodoxus numidicus (Récluz, 1841)
- Theodoxus olivaceus
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Theodoxus pilidei (Tournouêr, 1879)
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Theodoxus sarmaticus (Lindholm, 1901)
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Theodoxus schultzii (Grimm, 1877)
- † Theodoxus serratiliniformis Geyer, 1914
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Theodoxus velascoi (Graëlls, 1846)
