Coelurosauravus (name meaning "Hollow Lizard") is a genus of basal diapsid reptile that originated during the Late Permian Era in what is now Madagascar. A small lizard-like creature resembling a green iguana or other modern-day lizards, it had specialized wing-like structures allowing it to glide, similarly to the modern-day Flying Dragon from South-east Asia.
In the Series 1 episode "Desert Monsters" several Coelurosauravus were brought to the park from Late Permian Siberia, 250 million years ago. Due to their small size they are one of the few animals allowed to roam freely.