{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T20:56:11Z","timestamp":1789764971928,"version":"4.0.1"},"reference-count":49,"publisher":"Cambridge University Press (CUP)","issue":"4","license":[{"start":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T00:00:00Z","timestamp":1762387200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["cambridge.org"],"crossmark-restriction":true},"short-container-title":["Parasitology"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    The classification of the digenean genus\n                    <jats:italic>Gogatea<\/jats:italic>\n                    Lutz, 1935 has been complicated for almost a century due to morphological variability and reliance on limited diagnostic traits. This study re-evaluates the taxonomic status of\n                    <jats:italic>Gogatea serpentum<\/jats:italic>\n                    (Gogate, 1932) and\n                    <jats:italic>Gogatea burmanicus<\/jats:italic>\n                    (Chatterji, 1940) using an integrative framework combining morphology and molecular phylogenetics. Trematodes were recovered from the gallbladder and intestine of the rainbow water snake (\n                    <jats:italic>Enhydris enhydris<\/jats:italic>\n                    ) in southern Thailand. Morphological investigations included morphometrics, acetocarmine-stained preparations, scanning electron microscopy and multivariate analyses, while molecular analyses used mitochondrial COI and nuclear ITS2 and 28S rRNA markers. Both gonad-bearing and gonad-less individuals exhibited identical sequences across all markers, forming a strongly supported monophyletic group. Morphological variation was restricted to the presence or absence of gonads, with no separation detected by principal component analysis. These findings support the synonymization of\n                    <jats:italic>G. burmanicus<\/jats:italic>\n                    as a junior synonym of\n                    <jats:italic>G. serpentum<\/jats:italic>\n                    (following the original spelling by Gogate, 1932, as validated under the ICZN [International Code of Zoological Nomenclature]). The occurrence of gonad-less adults represents a biologically intriguing phenomenon, the causes of which remain unresolved but may involve developmental, host-related, or ecological factors. This study underscores the importance of combining molecular and morphological approaches for accurate delimitation of morphologically plastic digeneans. Updated morphological descriptions and molecular data for\n                    <jats:italic>G. serpentum<\/jats:italic>\n                    are provided, including morphometrics, staining profiles, scanning electron microscopy micrographs and genetic sequences. These findings refine the taxonomy of\n                    <jats:italic>Gogatea<\/jats:italic>\n                    , advance knowledge of helminth diversity in semi-aquatic snakes and support broader efforts in parasite systematics, host\u2013parasite ecology and biodiversity monitoring in Southeast Asia.\n                  <\/jats:p>","DOI":"10.1017\/s0031182025101054","type":"journal-article","created":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T06:45:39Z","timestamp":1762411539000},"page":"433-444","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":2,"title":["Hidden in morphology, revealed by molecular genetics: synonymization of\n                    <i>Gogatea burmanicus<\/i>\n                    (Chatterji, 1940) with\n                    <i>Gogatea serpentum<\/i>\n                    (Gogate, 1932) (Digenea: Cyathocotylidae)"],"prefix":"10.1017","volume":"153","author":[{"given":"Sila","family":"Viriyautsahakul","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6367-6687","authenticated-orcid":false,"given":"Vachirapong","family":"Charoennitiwat","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6795-3541","authenticated-orcid":false,"given":"Kittipong","family":"Chaisiri","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1821-7801","authenticated-orcid":false,"given":"Abigail Hui En","family":"Chan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chonlada","family":"Tippawan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexis","family":"Ribas","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/021018s57","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Barcelona"},{"name":"University of Barcelona"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2963-4811","authenticated-orcid":false,"given":"Panithi","family":"Laoungbua","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00akhwn95","id-type":"ROR","asserted-by":"publisher"}],"name":"Queen Saovabha Memorial Institute"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3448-1132","authenticated-orcid":false,"given":"Tanapong","family":"Tawan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00akhwn95","id-type":"ROR","asserted-by":"publisher"}],"name":"Queen Saovabha Memorial Institute"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0688-2422","authenticated-orcid":false,"given":"Urusa","family":"Thaenkham","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4894-5148","authenticated-orcid":false,"given":"Napat","family":"Ratnarathorn","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01znkr924","id-type":"ROR","asserted-by":"publisher"}],"name":"Mahidol University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2025,11,6]]},"reference":[{"key":"S0031182025101054_ref46","article-title":"Multiple sequence alignment using clustalW and CLUSTALX","author":"Thompson","year":"2002","journal-title":"Current Protocols in Bioinformatics"},{"key":"S0031182025101054_ref27","first-page":"1","article-title":"Studies on the family Cyathocotylidae Poche. 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Trematoda","volume":"71","author":"Chatterji","year":"1940","journal-title":"The Philippine Journal of Science"}],"container-title":["Parasitology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0031182025101054","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T10:11:09Z","timestamp":1779963069000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0031182025101054\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,6]]},"references-count":49,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2026,4]]}},"alternative-id":["S0031182025101054"],"URL":"https:\/\/doi.org\/10.1017\/s0031182025101054","relation":{},"ISSN":["0031-1820","1469-8161"],"issn-type":[{"value":"0031-1820","type":"print"},{"value":"1469-8161","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,11,6]]},"assertion":[{"value":"\u00a9 The Author(s), 2025. Published by Cambridge University Press.","name":"copyright","label":"Copyright","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:\/\/creativecommons.org\/licenses\/by\/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.","name":"license","label":"License","group":{"name":"copyright_and_licensing","label":"Copyright and Licensing"}},{"value":"This content has been made available to all.","name":"free","label":"Free to read"}]}}