A redescription of Riggia paranensis Szidat, 1948 (Isopoda, Cymothoidae) based on thirty-two specimens from curimatid fish of Rio de Janeiro, Brazil, with an emendation of the genus

Riggia paranensis Szidat, 1948 is redescribed on the basis of 30 female and 2 male specimens collected from the pericardial cavities of the curimatid fish Cyphocarax (=Curimata) gilberti (Quoy & Gaimard). The fishes were caught in the Itabapoana River, State of Rio de Janeiro, southeastern Brazil. The presence of "dwarf" males, as reported by Szidat, was verified. The fusion of the pleonites and pleotelson in adult females was also confirmed. The generic diagnosis was emended to include details of mouthparts and pleopods.