Coelurosauravus

Coelurosauravus is a genus of basal diapsid reptile, with specialized wing-like structures allowing it to glide. These were rod like structures with skin stretched over them; this features is unique to this genus. The average length of the specimens was 40 centimetres (16 in) and the body was long and flat, suitable for gliding. The skull was lizard-like with a pointed snout and contained a broad back with a serrated crest, superficially resembling the crests of ceratopsian dinosaurs. It lived during the Permian period in what is now Germany and Madagascar.

In Primeval
A male Coelurosauravus, later named "Rex", entered the present through a Time anomaly and, despite attempts to send it back to the Permian, quickly became a mascot for the team featured in the series. Coelurosauravus is incorrectly shown to be capable of powered flight rather than simple gliding, and shown to be far larger than its real size of 40 cm. In addition it is shown with a vertical head crest, which is entirely speculative.