 Because of similarities in skull and neck anatomy and the presence of hollow bones "Hesperosuchus" was formerly thought to be an ancestor of later carnosaurian dinosaurs, but based on more recent findings and research it is now known to be more closely related to crocodilians rather than dinosaurs.At only about 4 to 5 feet in length, "Hesperosuchus" is a relatively small and lightly built pseudosuchian.It is very closely comparable to the different genera, "Ornithosuchus woodwardi" and "Saltoposuchus longipes", which are both pseudosuchians as well.