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In the present study, we describe four new species of <jats:italic>Urocleidoides<\/jats:italic> parasitizing the gills of Characiformes and Gymnotiformes hosts from the coastal drainages of the eastern Brazilian Amazon. We also used a cophylogenetic approach to investigate the coevolutionary relationships between <jats:italic>Urocleidoides<\/jats:italic> species and their characiform hosts to determine which coevolutionary events are acting to diversify the parasites. To achieve our goal, we used Jane to estimate coevolutionary scenarios and PACo to assess the cophylogenetic signal and phylogenetic congruence between parasite and host phylogenies. The comparison between the parasite phylogeny, based on partial sequences of the 28S rDNA gene, and the host phylogeny, inferred from concatenated partial sequences of the RAG1, RAG2, Cytb, and COI genes, revealed a high degree of topological congruence between them. Our results indicate a mixed evolutionary scenario, where cospeciation played an important role but was accompanied by significant loss events, failure to diverge and host-switch, suggesting that the diversification of <jats:italic>Urocleidoides<\/jats:italic> in Characiformes did not occur in a restricted way but with episodes of adaptation and possible colonization of new hosts over time.<\/jats:p>","DOI":"10.1017\/s0022149x25100643","type":"journal-article","created":{"date-parts":[[2025,8,29]],"date-time":"2025-08-29T11:10:36Z","timestamp":1756465836000},"source":"Crossref","is-referenced-by-count":4,"title":["Taxonomy and molecular phylogeny of <i>Urocleidoides<\/i> spp. (Monopisthocotyla: Dactylogyridae): Four new species and cophylogenetic patterns in a clade of species parasitizing Characiformes hosts"],"prefix":"10.1017","volume":"99","author":[{"given":"J.F.","family":"Santos Neto","sequence":"first","affiliation":[{"name":"Universidade Federal do Par\u00e1"},{"name":"Universidade Federal do Par\u00e1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1962-5663","authenticated-orcid":false,"given":"G.B.","family":"Soares","sequence":"additional","affiliation":[{"name":"Universidade de S\u00e3o Paulo"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1230-5464","authenticated-orcid":false,"given":"M.V.","family":"Domingues","sequence":"additional","affiliation":[{"name":"Universidade Federal do Par\u00e1"},{"name":"Universidade Federal do Par\u00e1"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2025,8,29]]},"reference":[{"key":"S0022149X25100643_r62","doi-asserted-by":"publisher","DOI":"10.1093\/molbev\/msn083"},{"key":"S0022149X25100643_r34","doi-asserted-by":"publisher","DOI":"10.1017\/S0022149X23000925"},{"key":"S0022149X25100643_r59","doi-asserted-by":"publisher","DOI":"10.11646\/zootaxa.5081.4.5"},{"key":"S0022149X25100643_r93","doi-asserted-by":"publisher","DOI":"10.1017\/S0022149X16000717"},{"key":"S0022149X25100643_r94","doi-asserted-by":"publisher","DOI":"10.1093\/bioinformatics\/btg180"},{"key":"S0022149X25100643_r71","first-page":"1","article-title":"Integrative taxonomy of Urocleidoides spp. (Monogenoidea: Dactylogyridae) parasites of characiform and gymnotiform fishes from the coastal drainages of the Eastern Amazon","volume":"97","author":"Santos Neto","year":"2023","journal-title":"Brazil. 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