Champsosaurs ("Choristodera") were a group of extinct reptiles.
They were semi-aquatic and the best known genus (Champsosaurus),
outwardly resembled today's gharials and false gharials (Crocodile-like
reptiles with long narrow jaws that lived in
It is not entirely clear how Champsosaurs are related to other reptiles.
One possibility is that they are descended from Archosauromorphs (the ancestors
of Archosaurs including dinosaurs
and crocodiles), but another is that they are descended from
Lepidosauromorphs (the ancestors of lizards, snakes and sphenodonts).
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