The Brazilian Pareiasaur Revisited

Provelosaurus americanus is the only known representative of the Pareiasauria in the Americas. This mid-size pareiasaur from the Rio do Rasto Formation of southern Brazil has been traditionally considered to be related to smaller forms from the South African Karoo known as the “dwarf pareiasaurs” of Lopingian age. P. americanus , however, co-existed with dinocephalians, which indicates a Guadalupian age. New fossils provide a nearly complete...