A cladistic re-assessment of the Polycystis species complex (Polycystididae, Eukalyptorhynchia)

The taxonomy of the genus Polycystis Kolliker, 1845 sensu Schockaert & Karl ing, 1975 is discussed. Character analysis reveals the monophyletic state o f the three species groups these authors defined within it. As no synapomor phies for the three groups can be found, the genus is split in three genera : Polycystis Kolliker, 1845, Macrorhynchus Graff, 1882 and Paulodora Marcus , 1948. The systematic position of Macrorhynchus yaganus (Marcus, 1954) Evd onin, 1977 is also discussed, resulting in the erection of the new genus Ma rcusia gen. n.