The conchological and anatomical characters of the topotypes of Planorbis moquini Requien, 1848 have been studied in detail. Comparisons with Planorbis agraulus Bourguignat, 1864 from Algeria revealed that these species are distinct from each other. In addition we examined additional Planorbis spp. from Sardinia and Crete showing that neither species are conspecific with P. moquini and P. agraulus. The question remains as to which Planorbis spp. live in the Mediterranean in addition to P. moquini and P. agraulus.