In 2014-2015 and 2019-2021, teleost fishes off Galindez Island (Antarctic Peninsula) were examined for trematodes. Combined morphological and molecular analyses revealed the presence of eight trematode species of four families (Hemiuridae, Lecithasteridae, Opecoelidae, Lepidapedidae) from five fish species. Only adult trematodes were found and all of them are Antarctic endemics with their congeners occurring on other continents. The hemiuroids, Elytrophalloides oatesi (Leiper & Atkinson, 1914), Genolinea bowersi (Leiper & Atkinson, 1914), and Lecithaster macrocotyle Szidat & Graefe, 1967 belong to the most common Antarctic species and together with Lepidapedon garrardi (Leiper & Atkinson, 1914) and Neolebouria georgiensis Gibson, 1976 they were recorded as the least host-specific parasites. The originally sub-Antarctic Neolepidapedon macquariensis Zdzitowiecki, 1993 is a new record for the Antarctic Peninsula and Parachaenichthys charcoti (Vaillant), is a new host record. Neolebouria terranovaensis Zdzitowiecki, Pisano & Vacchi, 1993 is considered a synonym of N. georgiensis because of identical morphology and dimensions. The currently known phylogenetic relationships within the studied families are supported, including the polyphyly of Macvicaria Gibson & Bray, 1982 with the future need to accommodate its Antarctic species in a new genus. The validity of M. georgiana (Kovaleva & Gaevskaja, 1974) and M. magellanica Laskowski, Jezewski & Zdzitowiecki, 2013 needs to be confirmed by further analyses. Genetic sequence data are still scarce from Antarctica, and more studies applying integrative taxonomic approaches and large-scale parasitological examinations of benthic invertebrates are needed to match sequences of larval stages to those of well-characterised adults and to elucidate trematode life-cycles.

1 I Schmalhausen Institute of Zoology NAS of Ukraine Bogdan Khmelnytsky Street 15 Kyiv 01030 Ukraine

Department of Forest Ecology Faculty of Forestry and Wood Technology Mendel University in Brno Zemědělská 3 613 00 Brno Czech Republic

Institute of Ecology Nature Research Centre Akademijos 2 08412 Vilnius Lithuania

Institute of Parasitology Biology Centre of the Czech Academy of Sciences Branišovská 31 370 05 Ceske Budejovice Czech Republic

National Museum of Natural History NAS of Ukraine Bogdan Khmelnytsky Street 15 Kyiv 01030 Ukraine

National University of Life and Environmental Sciences of Ukraine Heroiv Oborony Street 15 Kyiv 03041 Ukraine

State Institution National Antarctic Scientific Center Taras Shevchenko Blvd 16 Kyiv 01601 Ukraine

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Morphological and molecular characterization of Stomachicola muraenesocis Yamaguti, 1934 (Digenea: Hemiuridae) from the daggertooth pike conger Muraenesox cinereus (Forsskål)