Dianella (gastropod)
# Dianella (gastropod)

Dianella is a little-known genus of small freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Hydrobiidae.

## Distribution

These are European freshwater snails; they occur in southeastern Europe, from northern Italy, through the Balkans, to the Black Sea and the Caspian Sea

## Description

Their relatively big shell has an onic or turriform shape with a common, prominent, spiral sculpture. The radula shows a rhachidian tooth with no basal cusps. Their stomach has a caecal appendix at its pyloric end. They have a Hydrobia-like central nervous system, a simple penis and a characteristic, big seminal receptacle at the end of a prominent spiral of the coiled oviduct.

## Species

Species within the genus Dianella include:

* † Dianella gracilis (Pavlović, 1903)
* Dianella schlickum Schütt, 1962
* Dianella thiesseana Kobelt, 1878

### Species brought into synonymy

* † Dianella crassa (Burgerstein, 1877): synonym of † Prososthenia crassa Burgerstein, 1877
* † Dianella nodosa (Burgerstein, 1877): synonym of † Prososthenia nodosa Burgerstein, 1877
* † Dianella reticulata (Burgerstein, 1877): synonym of † Prososthenia reticulata Burgerstein, 1877
* † Dianella suessi (Burgerstein, 1877): synonym of † Prososthenia suessi Burgerstein, 1877
