Duas novas espécies de Urocleidoides (Dactylogyridae: Ancyrocephalinae) e novos registros de monogenéticos (Dactylogyridae, Diplectanidae) parasitos de peixes dos rios Xingu e Paraíba do Sul, Brasil

Abstract

Considering the size of South America and the potential host fauna, recent studies affirm that monogeneans described so far represent only a small portion of the real richness of species. To increase the knowledge of biodiversity of monogeneans, as well as its distribution and associated hosts, a parasitological survey of freshwater fishes was carried out at the Rivers Xingu (3º12’ S, 52º12’ W), State of Pará and Paraíba do Sul (21°38’46’’S, 41°44’49’’W), State of Rio de Janeiro, Brazil. Two new species of Urocleidoides are studied, representing the first data on the parasitological fauna of Hoplias aimara. From the samples collected from different hosts, 19 new records of monogeneans were found parasitizing 10 species of fish of these two River basins, including 18 locality records, 9 host records and 1 geographical record, which are listed and commented in the present study. In addition, this is the first report of parasitism in Anostomoides passionis (Characiformes: Anostomidae) and Argonectes robertsi (Characiformes: Hemiodontidae).