Why are pterosaurs considered to be reptiles?
http://www.bindonart.com/p%20Pterosaurs.jpg Pterosaurs were flying reptiles that lived during the Mesozoic Era in the time of the dinosaurs. Appeared during the Triassic, and disappeared during the Jurassic period. Their wingspan was from a few inches to over 40 feet; they had hollow bones, were very light, and had small bodies. They also got large brains and good eyesight. They were reptiles, but not dinosaurs. All dinosaurs were diapsid reptiles with an upright stance. Pterosaurs probably had a semi-upright stance. Some paleontologists think that the pterosaurs’ stance could have been upright and that pterosaurs should therefore be included in the branch group of dinosaurs, the theropods. Both groups, dinosaurs and pterosaurs are closely related. Pterosaurs belong to the Diapsids Class; these include all the reptiles (except the turtles) and birds. They have two holes in the rear upper part of their skulls and two holes behind the eyes. They were lightly built with hollow bones, long
