Pterodactyloidea Pterodactyloidea Pterodactyloidea (derived from the Greek words "πτερόν" ("pterón", for usual "ptéryx") "wing", and "δάκτυλος" ("dáctylos") "finger" meaning "winged finger", "wing-finger" or "finger-wing") is one of the two traditional suborders of pterosaurs ("wing lizards"), and contains the most derived members of this group of flying reptiles. They appeared during the middle Jurassic Period, and differ from the basal (though paraphyletic) rhamphorhynchoids by their short tails and long wing metacarpals (hand bones). The most advanced forms also lack teeth, and by the late Cretaceous, all known pterodactyloids were toothless. Many species had well developed crests on the skull, a form of
Agrosaurus from Australia, which seems most probable, "Rhoetosaurus" and "Ozraptor", both from the Bajocian (Middle Jurassic) would be the oldest known Australian dinosaurs. They are well documented. Agrosaurus Agrosaurus (; Greek "agros" meaning 'field' and "sauros" meaning 'lizard', "field lizard") is the name given to the remains of what was originally believed to be a Triassic prosauropod from Australia. "Agrosaurus" would thus be the oldest dinosaur from that country. However, this appears to have been an error, and the material actually appears to come from "Thecodontosaurus" or a "Thecodontosaurus"-like animal from Bristol, England. The type species is "Agrosaurus macgillivrayi". Members of