THE TAXONOMIC STATUS OF PROTEOCEPHALUS-DUBIUS LARUE, 1911 (CESTODA, PROTEOCEPHALIDAE), A PUZZLING PARASITE OF PERCH (PERCA-FLUVIATILIS L)

The taxonomic status of the Fish cestode Proteocephalus dubius to Rue, 1911, a rare parasite of perch (Perca fluviatilis), is discussed on t he basis of morphological and isoenzyme analyses. The results reveal t hat P. dubius represents only an infrequent morphological Form of P. p ercae characterized by a smell, rounded and shallow apical organ, elon gate and/or rectangular proglottides and relatively long cirrus-sac re aching io the mid-line of the proglottis.