The first finding of freshwater nemerteans in Ohrid Lake (Macedonia) with some comments on the taxonomy of the genus Prostoma (Nemertea, Monostilifera)

The first finding of freshwater nemerteans from the genus Prostoma (Dugès 1828) from the relic Ohrid Lake is described in the article. Genetic analysis of the gene fragment CO1 was performed, according to which Prostoma of Ohrid Lake should be considered as conspecific with the widespread species P. graecense (Böhmig 1892). It has been assumed that P. graecense and P. eilhardi (Montgomery 1894) belong to the same species, which should be called Prostoma clepsinoides Dugès 1828 (the type species of the genus Prostoma). Data from the molecular and phylogenetic analysis prove that the family Prostomatidae is independent.