Champsosaurs appear to have evolved during either the late Triassic period, or perhaps during the Jurassic (the earliest fossils found to date come from Jurassic). Unlike dinosaurs and most other large reptiles, Champsosaurs survived the Cretaceous-Tertiary mass extinction. They did however become extinct during the Miocene epoch of the Neogene period, perhaps around 20 million years ago.
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).
Champsosaurs were semi-aquatic reptiles that lived between 170 and 20 million years ago
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