Colbert considered small lightly built archosaurs, such as Ornithosuchus and Hesperosuchus —both of which were at the time reconstructed as theropod dinosaur-like bipeds — to be typical pseudosuchians.
Colbert considerou que os arcosauros pequenos de constitución lixeira, como Ornithosuchus e Hesperosuchus (ambos foron nese tempo reconstruídos como bípedes de tipo dinosauro terópodo) eran pseudosuquios típicos.