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Unencysted metacercariae of <jats:italic>Microphallus<\/jats:italic> sp., were collected from the mesoglea of ctenophores of the genus <jats:italic>Pleurobrachia<\/jats:italic> Fleming; adult digeneans were recovered from the intestines of <jats:italic>Eudocimus albus<\/jats:italic> Linnaeus (Threskiornithidae) and <jats:italic>Buteogallus urubitinga<\/jats:italic> Gmelin (Accipitridae), in four locations from southeastern Mexico. Adult specimens were identified as <jats:italic>M. basodactylophallus<\/jats:italic> (Bridgman, 1969) based on the following features: body pyriform entirely covered by minute spines, prepharynx short, oesophagus very long, caeca short and widely divergent, testes slightly symmetrical and excretory vesicle short and V-shaped. Sequences from D1\u2013D3 domain of the large subunit of ribosomal DNA (LSU) were generated, aligned, and compared with those of congeneric species available in GenBank. Phylogenetic analyses indicated that the metacercariae and adults formed a clade together with an isolate identified as <jats:italic>M. basodactylophallus<\/jats:italic> from Florida, USA (GenBank: AY220628). The intraspecific genetic divergence among isolates was low ranged from 0.0% to 0.6%, allowing the link between the two stages of the life cycle. We observed phenotypic plasticity in the morphological traits of <jats:italic>M. basodactylophallus<\/jats:italic> adults in definitive hosts (mammals and birds) throughout the distribution, which ranged from the USA to southeastern Mexico. Finally, the unencysted metacercariae identified as <jats:italic>M. basodactylophallus<\/jats:italic> represent the first report of a microphallid in ctenophores.<\/jats:p>","DOI":"10.1007\/s11230-023-10131-2","type":"journal-article","created":{"date-parts":[[2023,12,21]],"date-time":"2023-12-21T09:02:16Z","timestamp":1703149336000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Linking metacercariae and adults of Microphallus basodactylophallus (Digenea: Microphallidae), based on larval stages from ctenophores and adult parasites from aquatic birds found in Mexico"],"prefix":"10.1007","volume":"101","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6213-1933","authenticated-orcid":false,"given":"Yeraldin","family":"Aldama-Prieto","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-3379-7628","authenticated-orcid":false,"given":"Jorge L.","family":"Navarro-Serralde","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8738-8199","authenticated-orcid":false,"given":"Enrico Alejandro","family":"Ru\u00edz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1054-1930","authenticated-orcid":false,"given":"Ana L.","family":"Sereno-Uribe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7050-8825","authenticated-orcid":false,"given":"Mart\u00edn","family":"Garc\u00eda-Varela","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,12,21]]},"reference":[{"key":"10131_CR1","unstructured":"American Ornithologists' Union (AOU). 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