Viviparus acerosus

Danube mud snail ( Viviparus acerosus ), housing

The Danube mud snail, also Danube river snail ( Viviparus acerosus ) is the freshwater snail, which is made to the order of Architaenioglossa.

Features

The housings are high and about 4 inches wide to about 6 cm. The females slimmer ( = lesser width ) than the males. The housings are gray yellow with three more or less clearly formed red ribbons on the turns. A total of seven coils are formed. The apex is small and pointed. The first two turns to take low and are quite flat, the following turns, however, to take very quickly, something more in height than in width. The windings are offset from each other by a well- pronounced seam.

Habitat and Distribution

The species lives in calm rivers or lakes, almost exclusively in the Danube region, mainly from Vienna down the Danube and in an isolated population in Passau. In the Pleistocene, the species was more widespread in Western Europe.

System

As to how the extinct "form" Viviparus acerous is made f clactonensis. The systematic status is unclear.

Similar Species

In the Italian mud snail ( Viviparus ater) the first turns take more in height than in the Danube mud snail, whose first two turns are very shallow.

Endangering

The species is endangered in Germany and, therefore, is on the red list of endangered species in Germany and Austria ( 2 = high risk ). In the Czech Republic, the species is classified as endangered.