The flatworms of the genus Cichlidogyrus Paperna, 1960 (Monogenea: Ancyrocephalidae) are gill parasites of freshwater fish, affecting predominantly the family Cichlidae. Cichlidogyrus tiberianus Paperna, 1960 and Cichlidogyrus dossoui Douëllou, 1993 are among the most widely distributed species of the genus, occurring in several African river basins and infecting many different host species, including the economically important Nile tilapia Oreochromis niloticus (Linnaeus) and redbreast tilapia Coptodon rendalli (Boulenger). Despite their wide distribution, C. tiberianus and C. dossoui have so far been studied only by light microscopy. In this paper they are redescribed on the basis of scanning electron microscopy of newly-collected material. The new material was obtained from redbreast tilapia caught in the Luapula River (D. R. Congo). The haptoral sclerites and genitalia are redescribed and illustrated in detail. Special attention is given to the complex morphology of the male copulatory organ.

Department of Biology Royal Museum for Central Africa Leuvensesteenweg 13 3080 Tervuren Belgium

Department of Biology Royal Museum for Central Africa Leuvensesteenweg 13 3080 Tervuren Belgium Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic Laboratory of Biodiversity and Evolutionary Genomics Department of Biology University of Leuven Charles Debériotstraat 32 3000 Leuven Belgium Capacities for Biodiversity and Sustainable Development Operational Directorate Natural Environment Royal Belgian Institute of Natural Sciences Vautierstraat 29 1000 Brussels Belgium

Department of Biology Royal Museum for Central Africa Leuvensesteenweg 13 3080 Tervuren Belgium Laboratory of Biodiversity and Evolutionary Genomics Department of Biology University of Leuven Charles Debériotstraat 32 3000 Leuven Belgium

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