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Helminthol."],"published-print":{"date-parts":[[2026]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Echinostomes are a globally distributed group of digeneans with complex life cycles. In South America, many species are known only from definitive hosts, and in Argentina, most larval stages and adult records remain unlinked. Formal morphological descriptions and molecular data are essential for identifying larval stages; however, molecular reference sequences of larval digeneans remain scarce. We present an integrated morphological and molecular characterisation of echinostome cercariae from\n                    <jats:italic>Biomphalaria aff. straminea<\/jats:italic>\n                    collected between January 2017 and February 2018 in a rice field from Corrientes Province, Argentina, based on partial DNA sequences of the nuclear\n                    <jats:italic>28S rRNA<\/jats:italic>\n                    (\n                    <jats:italic>28S<\/jats:italic>\n                    ) gene and the mitochondrial marker\n                    <jats:italic>nad1<\/jats:italic>\n                    gene. Eighty-three snails (2.12%) of the 3,913 sampled were infected with three echinostomatid morphotypes: Cercaria\n                    <jats:italic>Echinostoma<\/jats:italic>\n                    sp. 20 (1.63%); Cercaria Echinostomatidae gen. sp. 21 (0.25%); and Cercaria\n                    <jats:italic>Drepanocephalus<\/jats:italic>\n                    sp. (0.23%). Available Echinostomatidae sequences in GenBank were aligned with newly generated sequences from echinostomatid cercariae. Phylogenetic analyses showed that\n                    <jats:italic>Echinostoma<\/jats:italic>\n                    sp. 20 represents a distinct lineage that does not group with other\n                    <jats:italic>Echinostoma<\/jats:italic>\n                    sequences in GenBank; Echinostomatidae gen. sp. 21 does not cluster with\n                    <jats:italic>Echinostoma<\/jats:italic>\n                    and likely belongs to a genus related to\n                    <jats:italic>Patagifer<\/jats:italic>\n                    , although its position differs between the\n                    <jats:italic>28S<\/jats:italic>\n                    and\n                    <jats:italic>nad1<\/jats:italic>\n                    trees and it shows morphological differences; and\n                    <jats:italic>Drepanocephalus<\/jats:italic>\n                    sp. clusters with\n                    <jats:italic>D. spathans<\/jats:italic>\n                    from Mexico with low genetic divergence (&lt;4.6%), although additional sequence data are needed to clarify species boundaries. This study provides the first molecular identification of\n                    <jats:italic>Drepanocephalus<\/jats:italic>\n                    and\n                    <jats:italic>Echinostoma<\/jats:italic>\n                    species in freshwater snails from Argentina, expanding the molecular dataset for\n                    <jats:italic>Drepanocephalus<\/jats:italic>\n                    in South America.\n                  <\/jats:p>","DOI":"10.1017\/s0022149x26101680","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T07:21:19Z","timestamp":1789975279000},"source":"Crossref","is-referenced-by-count":0,"title":["Morphological and molecular characterisation of echinostomatid larvae (Digenea: Echinostomatidae) infecting\n                    <i>Biomphalaria aff. straminea<\/i>\n                    from Argentina"],"prefix":"10.1017","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8657-6323","authenticated-orcid":false,"given":"M.V.","family":"Fern\u00e1ndez","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03cqe8w59","id-type":"ROR","asserted-by":"publisher"}],"name":"Consejo Nacional de Investigaciones Cient\u00edficas y T\u00e9cnicas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6250-5555","authenticated-orcid":false,"given":"M.","family":"Laidemitt","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05fs6jp91","id-type":"ROR","asserted-by":"publisher"}],"name":"University of New Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"S0022149X26101680_r25","doi-asserted-by":"publisher","DOI":"10.1093\/molbev\/msae263"},{"key":"S0022149X26101680_r29","doi-asserted-by":"publisher","DOI":"10.11646\/zootaxa.1403.1.1"},{"key":"S0022149X26101680_r40","first-page":"159","article-title":"Population dynamics of planorbid snail from a lenitic biotope in northeastern Argentina. Larval trematodes of Biomphalaria occidentalis and analysis of their prevalence and seasonality","volume":"36","author":"Ostrowski de N\u00fa\u00f1ez","year":"1991","journal-title":"Acta Parasitologica Polonica"},{"key":"S0022149X26101680_r46","doi-asserted-by":"publisher","DOI":"10.11646\/zootaxa.3666.4.3"},{"key":"S0022149X26101680_r44","doi-asserted-by":"publisher","DOI":"10.1645\/GE-836R1.1"},{"key":"S0022149X26101680_r6","first-page":"128","article-title":"Biolog\u00eda de digeneos larvales asociados a plan\u00f3rbidos dulceacu\u00edcolas de Salta, Argentina","volume":"2","author":"Davies","year":"2024","journal-title":"Revista Ciencias Naturales"},{"key":"S0022149X26101680_r48","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijpara.2016.12.008"},{"key":"S0022149X26101680_r3","doi-asserted-by":"publisher","DOI":"10.1016\/j.parint.2015.09.008"},{"key":"S0022149X26101680_r42","first-page":"31","article-title":"Estudios sobre la fauna parasitaria del bigu\u00e1, Phalacrocorax o. olivaceus. 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