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Helminthol."],"published-print":{"date-parts":[[2026]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    This study provides the description of a new species of Anisakidae,\n                    <jats:italic>Contracaecum cocoi<\/jats:italic>\n                    sp. nov., as well as the record of\n                    <jats:italic>Contracaecum jorgei<\/jats:italic>\n                    , both species parasitizing the Cocoi heron\n                    <jats:italic>Ardea cocoi<\/jats:italic>\n                    (Ardeidae) in a locality from the Buenos Aires Province, Argentina. An integrative taxonomic approach was used, involving phylogenetic analyses and the examination of diagnostic morphological features in the studied specimens. Among other features, the new species can be morphologically distinguished by the papillae arrangement on the male tail: while\n                    <jats:italic>C. jorgei<\/jats:italic>\n                    exhibits a simple morphotype A,\n                    <jats:italic>C. cocoi<\/jats:italic>\n                    sp. nov. presents an intermediate morphotype B. Mainly, the possession of three adcloacal papillae pairs is a diagnostic feature separating this new species from the rest of the\n                    <jats:italic>Contracaecum<\/jats:italic>\n                    species. The\n                    <jats:italic>cox2<\/jats:italic>\n                    mtDNA isolates exhibited\n                    <jats:italic>C. cocoi<\/jats:italic>\n                    sp. nov. as a single node and grouped close to the clade formed by both species\n                    <jats:italic>Contracaecum micropapillatum<\/jats:italic>\n                    and\n                    <jats:italic>C. bancrofti.<\/jats:italic>\n                    The other\n                    <jats:italic>cox2<\/jats:italic>\n                    mtDNA sequences showed a great concordance with\n                    <jats:italic>C. jorgei.<\/jats:italic>\n                    The K2P distances calculated for the\n                    <jats:italic>cox2<\/jats:italic>\n                    mtDNA isolates of\n                    <jats:italic>C. cocoi<\/jats:italic>\n                    sp. nov. displayed a distance of 0.12 with\n                    <jats:italic>C. bancrofti<\/jats:italic>\n                    , 0.13 with\n                    <jats:italic>C. micropapillatum<\/jats:italic>\n                    , and 0.16 with\n                    <jats:italic>C. jorgei. Contracaecum cocoi<\/jats:italic>\n                    sp. nov. is proposed as a new taxon clearly supported by both phylogenetic analysis and distinctive morphological features that distinguish it from its congeners. The occurrence of\n                    <jats:italic>C. cocoi<\/jats:italic>\n                    sp. nov. together with\n                    <jats:italic>C. jorgei<\/jats:italic>\n                    in sympatric and syntopic conditions suggests that ecological or reproductive isolating mechanisms may be acting to maintain distinct lineages in shared environments. New records, particularly those involving intermediate and definitive hosts, will contribute to elucidating the distribution of these parasites in the Americas and potentially lead to the discovery of new species.\n                  <\/jats:p>","DOI":"10.1017\/s0022149x25101120","type":"journal-article","created":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T09:26:18Z","timestamp":1770283578000},"source":"Crossref","is-referenced-by-count":2,"title":["New\n                    <i>Contracaecum<\/i>\n                    species (Nematoda, Anisakidae) parasitizing\n                    <i>Ardea cocoi<\/i>\n                    Linnaeus (Aves, Ardeidae) in a mixed infection: morphological and molecular studies in Argentina"],"prefix":"10.1017","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9138-3577","authenticated-orcid":false,"given":"L.E.","family":"Garbin","sequence":"first","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"},{"name":"Universidad Nacional Arturo Jauretche (UNAJ)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7177-333X","authenticated-orcid":false,"given":"M.M.","family":"Montes","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8128-2075","authenticated-orcid":false,"given":"N.","family":"Arredondo","sequence":"additional","affiliation":[{"name":"Universidad de Buenos Aires"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Barneche","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8612-3057","authenticated-orcid":false,"given":"M.","family":"Ib\u00e1\u00f1ez Shimabukuro","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1728-9296","authenticated-orcid":false,"given":"M.","family":"Moncada","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.I.","family":"Diaz","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE), Universidad Nacional de La Plata (CONICET-UNLP)"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2026,2,5]]},"reference":[{"key":"S0022149X25101120_r52","first-page":"27","article-title":"R\u00e9sultats Scientiflques des Croisi\u00e8res du Navire-Ecole Beige \u201cMercator\u201d Vol. 1. 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