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Unfortunately, many of them are still poorly known and inadequately described. Molecular approaches are critical to delineate species which were impossible to differentiate based on morphology alone.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>New samples of adult <jats:italic>Phyllodistomum<\/jats:italic> spp. were collected from the urinary bladder and\/or ureters of European freshwater fishes and fixed to conduct a light and scanning electron microscopy study, and to obtain sequences of nuclear (ITS2 spacer and <jats:italic>28S<\/jats:italic> rRNA gene), to be analysed in the context of a molecular phylogeny.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Based on new findings, a new species of <jats:italic>Phyllodistomum<\/jats:italic> from the urinary bladder of the European perch, <jats:italic>Perca fluviatilis<\/jats:italic>, in Volga River basin, Russia, is described. Additionally, new data on the morphology and tegumental surface topography of <jats:italic>P. macrocotyle<\/jats:italic> (L\u00fche, 1909) Odhner, 1911 from ureters of the common rudd, <jats:italic>Scardinius erythrophthalmus<\/jats:italic>, is presented. The host range of <jats:italic>P. folium<\/jats:italic>, confirmed by DNA analysis, is extended to other cyprinid fish species.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>The present study has again shown that species of the genus <jats:italic>Phyllodistomum<\/jats:italic> are in dire need of revision based on both molecular analysis and detailed morphological redescriptions of the forms attributed to the genus. Morphologically, <jats:italic>P. kupermani<\/jats:italic> n. sp. most closely resembles <jats:italic>P. pseudofolium<\/jats:italic>, a highly host-specific parasite of <jats:italic>Gymnocephalus cernuus<\/jats:italic> (L.), but molecular phylogenetic analyses based on ITS2 and <jats:italic>28S<\/jats:italic> rDNA sequences showed that these species are distantly related. <jats:italic>Phyllodistomum kupermani<\/jats:italic> n. sp. was found to be phylogenetically most closely related to the type-species of <jats:italic>Phyllodistomum<\/jats:italic>, <jats:italic>P. folium.<\/jats:italic> Phylogenetic analyses revealed that <jats:italic>Phyllodistomum kupermani<\/jats:italic> n. sp. and <jats:italic>P. folium<\/jats:italic> formed a clade with other freshwater species for which cystocercous cercariae develop in bivalves of the family Sphaeriidae. The micromorphology and tegumental surface topography of <jats:italic>P. macrocotyle<\/jats:italic> revealed in the present study provide a valuable taxonomic criterion for congeneric species differentiation.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13071-020-04434-2","type":"journal-article","created":{"date-parts":[[2020,11,10]],"date-time":"2020-11-10T03:02:33Z","timestamp":1604977353000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Phyllodistomum kupermani n. sp. from the European perch, Perca fluviatilis L. (Perciformes: Percidae), and redescription of Phyllodistomum macrocotyle (L\u00fche, 1909) with notes on the species diversity and host specificity in the European Phyllodistomum spp. (Trematoda: Gorgoderidae)"],"prefix":"10.1186","volume":"13","author":[{"given":"Romualda","family":"Petkevi\u010di\u016bt\u0117","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander E.","family":"Zhokhov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Virmantas","family":"Stun\u017e\u0117nas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Larisa G.","family":"Poddubnaya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gra\u017eina","family":"Stanevi\u010di\u016bt\u0117","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,11,10]]},"reference":[{"key":"4434_CR1","first-page":"96","volume-title":"Ecological Parasitology","author":"MA Kudinova","year":"1994","unstructured":"Kudinova MA. 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