In 1997, Kevin Padian classified Pterosauromorpha as a clade of archosaurs and proposed phylogenetic definition for this group: "Pterosauria and all ornithodiran archosaurs closer to them than to dinosaurs".
In 1997, Kevin Padian categorized Pterosauromorpha as a clade of archosaurs and proposed a phylogenetic definition for this group: "Pterosauria and all ornithodiran archosaurs closer to them than to dinosaurs".