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The intestine of one alligator from Alabama was infected by <jats:italic>Dracovermis occidentalis<\/jats:italic> Brooks and Overstreet, 1978 (Platyhelminthes: Digenea: Liolopidae Odhner, 1912), a seldom collected and incompletely described trematode that lacks a representative nucleotide sequence. Liolopidae comprises 5 genera and 15 species: <jats:italic>Liolope<\/jats:italic> spp. infect giant salamanders; <jats:italic>Helicotrema<\/jats:italic> spp. infect turtles and lizards; <jats:italic>Harmotrema<\/jats:italic> spp. infect snakes; <jats:italic>Paraharmotrema<\/jats:italic> spp. infect turtles; and <jats:italic>Dracovermis<\/jats:italic> spp. infect crocodilians. Based on our study of the newly collected specimens and the holotype of <jats:italic>D. occidentalis<\/jats:italic>, we redescribe <jats:italic>D. occidentalis<\/jats:italic>, correct errors in its original description, and provide an updated phylogeny for Liolopidae that, for the first time, includes <jats:italic>Dracovermis<\/jats:italic> Brooks and Overstreet, 1978. Our specimens were identified as <jats:italic>D. occidentalis<\/jats:italic> by having testes in the posterior 1\/3 of the body, a pretesticular cirrus sac, a spined and eversible cirrus, a bipartite seminal vesicle, and a post-acetabular vitellarium. A phylogenetic analysis of the D1\u2013D3 domains of the nuclear large subunit ribosomal DNA (<jats:italic>28S<\/jats:italic>) recovered Liolopidae as monophyletic; however, low taxon sampling in the group precludes hypothesis-testing about liolopid-vertebrate cophyly. This is the first collection for morphological study of the type species for <jats:italic>Dracovermis<\/jats:italic> since the genus was proposed 46\u00a0years ago, the first record of a liolopid from Alabama, and the first phylogenetic analysis that includes <jats:italic>Dracovermis<\/jats:italic>.<\/jats:p>","DOI":"10.1007\/s00436-024-08339-2","type":"journal-article","created":{"date-parts":[[2024,9,19]],"date-time":"2024-09-19T05:01:58Z","timestamp":1726722118000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Redescription of Dracovermis occidentalis (Digenea: Liolopidae) infecting American alligator, Alligator mississippiensis from the Bon-Secour River (Mobile\u2013Tensaw River Delta, Alabama, USA) and a revised phylogeny for Liolopidae"],"prefix":"10.1007","volume":"123","author":[{"given":"Haley R.","family":"Dutton","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen A.","family":"Bullard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John H.","family":"Brule","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anita M.","family":"Kelly","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,19]]},"reference":[{"key":"8339_CR1","doi-asserted-by":"publisher","first-page":"87","DOI":"10.1023\/A:1006024128098","volume":"41","author":"GR Anderson","year":"1998","unstructured":"Anderson GR, Barker SC (1998) Inference of phylogeny and taxonomy within the Didymozoidae (Digenea) from the second internal transcribed spacer (ITS2) of ribosomal DNA. 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