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Three new species of  Urocleidoides  Mizelle &amp;amp; Price, 1964 are described from the gills of characiform fishes in the Tocantins River and its tributaries.  Urocleidoides boulengerellae  sp. nov. is described from  Boulengerella cuvieri  (Spix &amp;amp; Agassiz, 1829) and differs from all its congeners by the dorsal bar with a long posteromedial projection; male copulatory organ with 2–3 counterclockwise rings and a base with a flange; an accessory piece comprising a robust Y-shaped unit and a sheath-like unit; and a highly sclerotized vaginal canal.  Urocleidoides paratriangulus  sp. nov., described from  Psectrogaster amazonica  Eigenmann &amp;amp; Eigenmann, 1889,  Cyphocharax gouldingi  Vari, 1992,  Caenotropus labyrinthicus  (Kner, 1858) and  Mylesinus paucisquamatus  Jégu &amp;amp; Santos, 1988, is most similar to  Urocleidoides triangulus  (Suriano, 1981) Rossin &amp;amp; Timi, 2016 based on the shape of the anchors and bars but differs from  U. triangulus  in the morphology of the projection of the dorsal bar, the number of rings of male copulatory organ, and by the smaller size of members of hook pairs 1 and 5 compared with those of the remaining pairs.  Urocleidoides tocantinensis  sp. nov. is easily distinguished from all other species of the genus by the morphology of the vagina, which present a vaginal vestibule with a membranous cap.  Urocleidoides triangulus  is reported from its type host in the Guandu River, state of Rio de Janeiro. The present study increases the number of  Urocleidoides  species to 37 recognized species that fit all the generic characters.

zoologia

Three new species of Urocleidoides (Monogenoidea: Dactylogyridae) parasitizing characiforms (Actinopterygii: Characiformes) in Tocantins River, states of Tocantins and Maranhão, and new record for U. triangulus in Guandu River, state of Rio de Janeiro, Brazil