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Temporal range: Upper Cretaceous
Opisthocoelicaudia is a genus of titanosaur sauropod dinosaur. It is from Late Cretaceous rocks from Mongolia's Nemegt Basin. In 1965 a well preserved skeleton was found, missing only a neck and head.
Possible synonymy with Nemegtosaurus[change | change source]
Scientists are arguing whether Nemegtosaurus is a synonym of Opisthocoelicaudia or its own genus, or vice versa.