Theodoxus meridionalis is a species of freshwater snail with a gill and an operculum. It is an aquatic gastropod mollusk in the family Neritidae, the nerites.
The distribution of this species includes Sicily (which is part of Italy), and north-western Tunisia.
The type locality is Syracuse, Sicily.[1]
The shell is cone-shaped to half-egg-shaped, almost smooth and weakly shiny. The color is pale yellowish with dark red to blackish zigzag streaks.
Dimensions of the shell are 4-5 × 7-8 mm.
This small snail lives in cold running waters.
This article incorporates public domain text from the reference[2]