The aim of the present study was to record the occurrence of parasites in Cambeva davisi (= Trichomycterus davisi) (Siluriformes: Trichomycteridae) from the Cascavel Stream, in the Iguaçu River basin, municipality of Cascavel, state of Paraná, Brazil, and present a review of the parasites reported infecting trichomycterids belonging to Cambeva and Trichomycterus species from the Neotropical region. Eighty-one fish specimens were collected using the electrofishing technique, with three standardized passes with a duration of 40 min, with extensions of 50 m for each site. In the laboratory, the fish were necropsied, and parasitological and histological analyses were conducted. Two parasite species were found and identified as nymphs of Sebekia oxycephala (Pentastomida) (Prevalence [P] = 8.54%) and Minilernaea floricapitella (Crustacea: Lernaeidae) (P = 1.23%), both representing new records of distribution and host-parasite relationships for genus Cambeva. The presence of the nymphs of S. oxycephala did not result in harmful histological changes or a significant inflammatory process in infected organs. Twenty-one taxa of parasites have been described parasitizing trichomycterids belonging to Trichomycterus (sensu stricto) and Cambeva from the Neotropical region. Nymphs of S. oxycephala have already been reported in freshwater fish belonging to 10 different orders, and M. floricapitella has been found parasitizing Brazilian fishes belonging to two orders. The nymphs of S. oxycephala did not cause histopathological changes and the new records of distribution and host-parasite relationships reported here enrich knowledge of the parasitic fauna of freshwater fish from the Neotropical region.

本研究的目的是记录在巴西巴拉那州卡斯卡韦尔市伊瓜苏河流域的卡斯卡韦尔溪流中的Cambeva davisi（= Trichomycterus davisi）（Siluriformes：Trichomycteridae）寄生虫的发生情况。对寄生虫的综述报告说，它们感染了来自新热带地区的Cambeva和Trichomycterus物种的毛癣菌。使用电钓技术收集了八十一条鱼标本，进行了三次标准化通行，持续时间为40分钟，每个站点延伸50 m。在实验室中，对鱼进行了尸检，并进行了寄生虫学和组织学分析。发现了两个寄生虫物种，并将其鉴定为若虫氧化头孢（Sentakia oxycephala）（患病率[P] = 8.54％）和小花菌（Minilernaea floricapitella）（甲壳纲：Lernaeidae）（P  = 1.23％），均代表了Cambeva属的分布和寄主－寄生虫关系的新记录。若虫的存在S. oxycephala没有造成有害的组织学改变或感染器官显著炎症过程。已经描述了二十一种寄生虫类群，它们寄生了来自新热带地区的毛线虫（sensu stricto）和Cambeva的毛癣菌。若虫S. oxycephala据报道，属于10个不同等级的淡水鱼类中已经发现了floricapitella寄生于两个等级的巴西鱼类。oxycephala的若虫没有引起组织病理学变化，这里报道的新的分布和寄主－寄生虫关系新记录丰富了新热带地区淡水鱼寄生动物的知识。