Pachystropheus (After Greek Pachys, "Thick" and Strophaios, Vertebrae) is a genus of prehistoric reptile, possibly a choristodere (champsosaur), from the Rhaetian (Late Triassic) of southwestern England. It was named by Erika von Huene in 1935; Huene described Pachystropheus as a champsosaur, but this was overlooked for decades until its redescription by Storrs and Gower in 1993. This reevalution would extend the fossil record of champsosaurs back 45 million years.
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