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Theodoxus
''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. 〔 Bouchet, P. (2014). Theodoxus Montfort, 1810. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153531 on 2014-11-17.〕
== Distribution ==
The distribution of the genus ''Theodoxus'' includes Europe and northern Africa and also extends east to southern Iran.〔 No other species within Neritidae have sympatrical distribution with ''Theodoxus''.〔 The distribution of the genus ''Theodoxus'' is an exception within Neritidae, because Neritidae live primarily in the southern hemisphere.〔 Species within ''Theodoxus'' are the only Neritidae snails, that live in temperate climate.〔
Bunje & Lindberg (2007) presented the first phylogenetic hypothesis of the clade ''Theodoxus''.〔Bunje P. M. & Lindberg D. R. (2007). "Lineage divergence of a freshwater snail clade associated with post-Tethys marine basin development". ''Molecular Phylogenetics and Evolution'' 42(2): 373–387. .〕 The evolution of the genus ''Theodoxus'' was affected by separating of Mediterranean sea and Paratethys sea in Miocene.〔
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