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Hologenophores were used to sequence the small (SSU) and large (LSU) subunits of ribosomal DNA and cytochrome c oxidase subunit 1 (<jats:italic>cox 1<\/jats:italic>) from mitochondrial DNA.\u00a0Phylogenetic analysis of the new SSU and LSU sequences of <jats:italic>M. ingens<\/jats:italic> placed them in a clade with other sequences available in GenBank identified as <jats:italic>M. ingens<\/jats:italic>. The <jats:italic>cox 1<\/jats:italic> tree showed that the nine new sequences and six previously published sequences of <jats:italic>M. ingens<\/jats:italic> from the USA form a clade with other sequences previously identified as <jats:italic>M. ingens<\/jats:italic> from GenBank<jats:italic>.<\/jats:italic> The intraspecific genetic divergence among isolates from the Americas ranged from 0 to 2%, and in combination with the phylogenetic trees confirmed that the isolates belonged to the same species. The <jats:italic>cox 1<\/jats:italic> haplotype network inferred with 15 sequences revealed 10 haplotypes separated from each other by a few substitutions. Rio Grande Leopard Frogs and Vaillant\u00b4s Frogs harbored cystacanths with low prevalence, 28% and 37% respectively, in Mexico. Brown Basilisks, an invasive lizard in Florida, USA, had high values of prevalence, 92% and 93% in males and females, respectively. Females harbored more cystacanths than males (0\u201339 <jats:italic>vs<\/jats:italic> 0\u201321) for unknown reasons that may, however, be related to ecological differences.<\/jats:p>","DOI":"10.1007\/s11230-023-10104-5","type":"journal-article","created":{"date-parts":[[2023,6,20]],"date-time":"2023-06-20T05:01:42Z","timestamp":1687237302000},"page":"543-556","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A molecular and ecological study of Macracanthorhynchus ingens (von Linstow, 1879) (Acanthocephala: Archiacanthocephala), in its paratenic and definitive hosts in southeastern Mexico and the Eastern USA"],"prefix":"10.1007","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0499-6768","authenticated-orcid":false,"given":"Mirza Patricia","family":"Ortega-Olivares","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5520-6573","authenticated-orcid":false,"given":"Yanet","family":"Vel\u00e1zquez-Urrieta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1054-1930","authenticated-orcid":false,"given":"Ana Lucia","family":"Sereno-Uribe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-2319-3656","authenticated-orcid":false,"given":"Michael B.","family":"Harvey","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":[[2023,6,20]]},"reference":[{"key":"10104_CR1","doi-asserted-by":"publisher","unstructured":"Amin, O. 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