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The systematic position, phylogenetic relationships and composition of the genus  Leyogonimus  Ginetsinskaya, 1948 have always been uncertain. In the present study, we investigate the taxonomic position and phylogenetic relationships between the type-species  L .  polyoon  ( Linstow, 1887 ) and  L .  postgonoporus  ( Neiland, 1951 ) (previously classified as  Macyella ), based on newly obtained partial sequences of the nuclear large ribosomal subunit DNA. To test some of the previously proposed systematic arrangements, we have also sequenced specimens of  Stomylotrema vicarium  Braun, 1901 and  Phaneropsolus  sp. Our results clearly demonstrate that both  L .  polyoon  and  L .  postgonoporus  belong to the family Pleurogenidae Looss, 1899 within the superfamily Microphalloidea. Thus, the Leyogonimidae  Dollfus, 1951  should be recognized as a synonym of the Pleurogenidae.  Leyogonimus polyoon  clearly constitutes a separate, sister branch to the clade consisting of  Collyricloides massanae  Vaucher, 1969  and  L .  postgonoporus . Based on these results, we resurrect the genus  Macyella  Neiland, 1951  with type-species  M .  postgonoporus . Besides,  Collyricloides  Vaucher, 1968 is synonymized with  Macyella  resulting in new combination  Macyella massanae  (Vaucher, 1968) comb. nov. Molecular phylogenetic analysis has demonstrated the lack of a close phylogenetic relationships between  Stomylotema vicarium  and  Leyogonimus  previously placed by several authors into the family Stomylotrematidae Poche, 1925. The status of the Phaneropsolidae Mehra, 1935 as independent family was confirmed with the addition of the newly sequenced  Phaneropsolus  sp. from China.

acta parasitologica

The systematic position and structure of the genus  Leyogonimus  Ginetsinskaya, 1948 (Platyhelminthes: Digenea) with comments on the taxonomy of the superfamily Microphalloidea Ward, 1901