Snails of the genus Theodoxus belong to the order Archaeogastropoda and to the family Neritidae:

Kingdom: Mollusca
Class: Gastropoda
Order: Archaeogastropoda
Superfamily: Neritoidea
Family: Neritidae
Genus: Theodoxus

(taken from www.aicon.com/plio/lista.htm)

TheodoxUKR38_1a

These specimen from the Dnestr River system demonstrate the highly variable coloration and pigmention pattern even within one population. Some banded specimens could be wound next to dotted or fine striped ones. Background colorarion reached from reddish over grey to brown.

TheodDnjestr

More variability can be observed between populations. The specimens from another population from the Ukrainian Dnestr system are very dark and with few pattern.

TheodCetina

Here some particularly beautifull specimens from the Cetina River in Croatia.

TheodMoraca

These fine banded specimens came from the moraca River in Montenegro.

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