Neritidae Rafinesque, 1815

Gloeer, Peter & Pesic, Vladimir, 2012, The freshwater snails (Gastropoda) of Iran, with descriptions of two new genera and eight new species, ZooKeys 219, pp. 11-61: 12

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Neritidae Rafinesque, 1815


Family Neritidae Rafinesque, 1815  


Theodoxus   and Neritina   are distinguished from each other by their ontogeny ( Bandel 2001). While the Theodoxus   species hatch from the spawn as miniature adult, Nertina   species leave their spawn as planktotrophic larva that will float in the sea for a more or less extended period before its metamorphosis to a crawling young. However, at the adult stage the taxonomic separation of species of the genera Theodoxus   and Neritina   is not always easy. As most of the Neritina   spp. are marine species and usually have a denticulate border of the columella and two apophysis of the operculum, most species of the genus Theodoxus   are limnic and have a smooth border of the columella and one apophysis (the “rib”); some also have a small apophysis, the peg, on the operculum ( Glöer 2002). Further, in Neritina   the peg is thick and strong, while in Theodoxus   it is, if exists at all, small and weak. A revision of this family, particularly its subdivion in clearly defined genera is needed.