The Planorbis species of the Balkans with the description of Planorbis vitojensis n. sp. (Gastropoda: Planorbidae)

New samples from Greece revealed a Planorbis sp. which could be identified as Planorbis atticus by comparing these specimens with topotypes of Bourguignat’s collection. The anatomy of P. atticus has been compared with that of Planorbis spp. living in neighbouring countries and revealed that P. atticus is distinct from P. planorbis, P. macedonicus, P. presbensis, and P. intermixtus, as well. Because the syntypes of P. atticus could not be found in Bourguignat’s collection in Geneva nor in Paris we designate a neotype.
In addition new samples from Montenegro revealed an unknown Planorbis species, which we describe here as P. vitojensis n. sp., which seems to be closely related with P. carinatus O.E. Müller 1774, and P. kubanicus Soldatenko & Starobogatov 1998.
A distribution map of the Planorbis spp. under discussion is given.