A new species of Mizelle & Price 1964 (Monogenea: Dactylogyridae) parasite of Eigenmann & Kennedy, 1903 (Hemiodontidae) from the upper Paraná River floodplain.

During the study of ectoparasites (Platyhelminthes) of fish in the floodplain of the Upper Paraná River - Brazil, a new species of , present in the gill filaments of (Hemiodontidae), is described using morphological description and molecular data from the mitochondrial region of cytochrome oxidase, subunit 1 () and the partial region of the 28S rDNA gene. n. sp. differs from all its congeners by the presence of a filament that joins the accessory piece to the base of the male copulatory organ and resembles and Phylogenetic analyses using molecular data revealed that n. sp. forms a paraphyletic group concerning the other species. In this way, as well as contributing to the description of a new species, we seek to encourage and contribute to the increase in research using integrative taxonomy, thus making it possible to elucidate some unresolved questions about the genus