Lyperosomum Looss, 1899 is one of the largest genera of the Dicrocoeliidae and is one of the best examples of the systematic complexity and taxonomic instability within this family. We present the molecular analyses based on novel sequences of nuclear and mitochondrial genes obtained from 56 isolates of adult flukes and larval stages of dicrocoeliids belonging to Lyperosomum, Skrjabinus, Zonorchis as well as previously available sequence data. According to obtained results we propose to return Zonorchis clathratus and Z. petiolatus into Lyperosomum, and to recognize L. alagesi as a synonym of L. petiolatum. Our study shows that L. petiolatum commonly occurs in Europe in corvids as well as in several species of migratory songbirds, e.g. Sylvia atricapilla. At the same time, the Turdidae appear to host a distinct species of Lyperosomum. The phylogenetic analysis has clearly demonstrated the paraphylepic nature of Lyperosomum and indicated the need of its thorough revision preferably using specimens from type hosts and type territories of nominal species. In addition, inclusion of numerous not yet sequenced dicrocoeliid genera into future phylogenetic studies is necessary to clarify the interrelationships of taxa within the family and stabilize its system.

Comenius Museum Horní námĕsti 7 750 11 Přerov Czech Republic

Department of Biology University of North Dakota Grand Forks ND 58202 USA

Department of Parasitology Institute of Genetics and Microbiology University of Wrocław Przybyszewskiego 63 51 148 Wrocław Poland

Department of Systematic and Ecology of Invertebrates Institute of Biology Wrocław University of Environmental and Life Sciences Kożuchowska 5b 51 631 Wrocław Poland

Institute of Parasitology Polish Academy of Science Twarda 51 55 00 818 Warszawa Poland

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New molecular data help clarify the taxonomy of central European avian dicrocoeliidae Looss, 1899 (Trematoda: Plagiorchiida)