 "Proterosuchus" is an early member of Archosauriformes, which also contains crocodilians, pterosaurs, and dinosaurs, including birds.It is the type genus of Proterosuchidae, which also contains the genus "Archosaurus".Proterosuchidae is, by definition, the most basal clade of archosauriforms, as Archosauriformes is defined based on their phylogenetic position.