Cymothoidae es la familia más común de isópodos parásitos encontrados en peces de Brasil. Entre los cimotoideos de agua dulce, el género Braga con siete especies ya registradas en el país. Braga nasuta Schioedte & Meinert (1881) fue originalmente registrada por la primera vez en la Costa de Brasil, pero ya se ha registrado en peces de agua dulce en los estados brasileños de Amazonas, Bahia, São Paulo y Pará. Un macho adulto de B. nasuta fue registrado por primera vez parasitando el pez ornamental, Hyphessobrycon eques (Steindachner, 1882) muestreado en la Reserva Particular de Patrimonio Natural Cisalpina, Mato Grosso do Sul, Brasil. Este estudio también representa el primer registro de ese isópodo parásito en la región Centro-Oeste del Brasil. El registro de isópodos parásitos en una especie de pez muy apreciada y exportada como H. eques aumenta la preocupación del poten...

A new species of Monogenea - Trinibaculum pinctiarum n. sp. is described from the gills of Astyanax fasciatus known as "lambari do rabo vermelho", sampled in the Paranapanema River, Jurumirim reservoir, São Paulo State, Brazil. The new species is allocated to the genus Trinibaculum because it has a double ventral bar and dextro-lateral vagina. It is the second species (first species is Trinibaculum altiparanae) belonging to this genus that parasitizes the gills of the fish genus Astyanax. This monogenean is similar to T. altiparanae regarding the haptor structures and the bulbous distal vagina. However, Trinibaculum pinctiarum n. sp. differs in having: (1) coiled male copulatory organ, (2) accessory structure shaped as tweezers, (3) absence of postmedian process in the ventral bar, and (4) hooks with depressed thumb. The phylogenetic hypothesis of the genus Trinibaculum (Consistency ind...

The aim of study is to report for the first time the occurrence of Rhinoxenus bulbovaginatus infesting the nasal cavity of Salminus hilarii from the Taquari River, São Paulo State, Brazil. Rhinoxenus bulbovaginatus was originally described parasitizing the nasal cavities of Salminus brasiliensis from the Paraná River. Rhinoxenus spp. are monogenean parasites from the nasal cavities of Characiformes fishes in the Neotropical region. To date, eight species of Rhinoxenus were described in seven different hosts. This study broadens the range of hosts parasitized with monogeneans of nasal cavities.