{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T17:53:30Z","timestamp":1790013210407,"version":"4.0.1"},"reference-count":72,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2024,5,22]],"date-time":"2024-05-22T00:00:00Z","timestamp":1716336000000},"content-version":"vor","delay-in-days":142,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100022231","name":"Artdatabanken, Sveriges Lantbruksuniversitet","doi-asserted-by":"publisher","award":["dha 2019.4.3-48"],"award-info":[{"award-number":["dha 2019.4.3-48"]}],"id":[{"id":"10.13039\/501100022231","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Parasite"],"accepted":{"date-parts":[[2024,4,25]]},"published-print":{"date-parts":[[2024]]},"abstract":"<jats:p>Several studies have shown that the euryxenic trematode <jats:italic>Derogenes varicus<\/jats:italic> (M\u00fcller, 1784) represents a species complex. Four lineages have been designated (DV1\u20134) with the DV1 clade corresponding to <jats:italic>D. varicus sensu stricto<\/jats:italic>. Herein, we investigate newly collected specimens of <jats:italic>D. varicus sensu lato<\/jats:italic> from Scandinavian and Arctic waters using integrative taxonomy. The trematodes were collected from <jats:italic>Melanogrammus aeglefinus<\/jats:italic>, <jats:italic>Eutrigla gurnardus<\/jats:italic>, <jats:italic>Trachinus draco<\/jats:italic>, and <jats:italic>Merluccius merluccius<\/jats:italic> off the Atlantic coast of Sweden and from <jats:italic>Hippoglossoides platessoides<\/jats:italic> from Arctic Svalbard. 28S sequences of derogenids from Sweden were identical to <jats:italic>D. varicus sensu stricto<\/jats:italic>, confirming its euryxeny. The 28S sequences of <jats:italic>Derogenes sp<\/jats:italic>. from <jats:italic>H. platessoides<\/jats:italic> were identical to <jats:italic>Derogenes<\/jats:italic> DV2 and differed from <jats:italic>D. varicus sensu stricto<\/jats:italic> by 3% and from <jats:italic>Derogenes<\/jats:italic> DV3 by 2%. The 28S sequence divergences of <jats:italic>Derogenes<\/jats:italic> sp. from <jats:italic>H. platessoides<\/jats:italic> with <jats:italic>D. ruber<\/jats:italic> and <jats:italic>D. lacustris<\/jats:italic> were 3 and 10%, respectively. ITS2 and <jats:italic>cox<\/jats:italic>1 divergences between <jats:italic>Derogenes<\/jats:italic> sp. from <jats:italic>H. platessoides<\/jats:italic> and other <jats:italic>Derogenes<\/jats:italic> species\/lineages were at levels of interspecific differences. The species from <jats:italic>H. platessoides<\/jats:italic> is described here as <jats:italic>D. abba<\/jats:italic> n. sp. We also examined the type material of <jats:italic>Progonus muelleri<\/jats:italic> (Levinsen, 1881), the type and only species of the genus <jats:italic>Progonus<\/jats:italic>, with redescription and designations of paralectotypes. Based on specimens from Theodor Odhner\u2019s collections at the Swedish Museum of Natural History, SMNH, Stockholm, we provide novel morphological and anatomical data for <jats:italic>D. varicus sensu lato<\/jats:italic> species complex. Lastly, we investigated Arthur Looss\u2019s \u201clost collection\u201d of Trematodes at the SMNH and characterised a putative species <jats:italic>Derogenes<\/jats:italic> sp. \u201c<jats:italic>limula<\/jats:italic>\u201d.<\/jats:p>","DOI":"10.1051\/parasite\/2024024","type":"journal-article","created":{"date-parts":[[2024,5,22]],"date-time":"2024-05-22T08:08:05Z","timestamp":1716365285000},"page":"26","source":"Crossref","is-referenced-by-count":9,"title":["Untangling the <i>Derogenes varicus<\/i> species complex in Scandinavian waters and the Arctic: description of <i>Derogenes abba<\/i> n. sp. (Trematoda, Derogenidae) from <i>Hippoglossoides platessoides<\/i> and new host records for <i>D. varicus<\/i> (M\u00fcller, 1784) <i>sensu stricto<\/i>"],"prefix":"10.1051","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9620-8273","authenticated-orcid":false,"given":"Chahinez","family":"Bouguerche","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1015-4703","authenticated-orcid":false,"given":"Daniel C.","family":"Huston","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9983-267X","authenticated-orcid":false,"given":"Egil","family":"Karlsbakk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9966-3431","authenticated-orcid":false,"given":"Mohammed","family":"Ahmed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4285-0754","authenticated-orcid":false,"given":"Oleksandr","family":"Holovachov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"250","published-online":{"date-parts":[[2024,5,22]]},"reference":[{"key":"R1","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1645\/14-496.1","volume":"10","author":"Ahuir-Baraja","year":"2015","journal-title":"Journal of Parasitology"},{"key":"R2","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1080\/00222930310001613557","volume":"39","author":"Bartoli","year":"2005","journal-title":"Journal of Natural History"},{"key":"R3","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1051\/parasite\/2023030","volume":"30","author":"Bouguerche","year":"2023","journal-title":"Parasite"},{"key":"R4","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1080\/00222937900770331","volume":"13","author":"Bray","year":"1979","journal-title":"Journal of Natural History"},{"key":"R5","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1071\/ZO9890055","volume":"37","author":"Bray","year":"1989","journal-title":"Queensland. 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