Theodoxus euxinus is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites.

[2][3] The distribution of this species includes: The type locality is Dobrogea, Romania.

The shell is shiny, smooth, with a coarse white ziczac pattern.

[3] This species occurs in woodlands of the Danube Delta region, on rocks, and on sandy or muddy substrates.

[3] This article incorporates public domain text from the reference[3]