The first record of dinocephalians in South America: Late Permian (Rio do Rasto Formation) of the Parana Basin, Brazil

Dinocephalian therapsids are reported for the first time in South America. The remains, mostly isolated teeth, were collected in the Rio do Rasto Form ation (Late Permian of the Parana Basin), cropping out at the Posto Queimad o locality, South Brazil. Two dinocephalian groups were recognised, the sub family Brithopodinae and the family Titanosuchidae. The chronological distr ibution of Dinocephalia ranges from the Ufimian to the Early Tatarian, char acterising the Posto Queimado fauna as the oldest known for the Rio do Rast o Formation.