A new species of Meticonaxius from Brazil (Crustacea, Decapoda, Callianideidae). Meticonaxius capricorni, sp. n., is described from material collected off Rio de Janeiro and São Paulo States, in depths of 139-214 metres. The genus Meticonaxius up to now has 3 species in Brazil: M. lemoscastroi Rodrigues & Carvalho, M. minutus Coelho and this new species