Riojasauridae

Extinct clade of dinosaurs

Riojasauridae is an extinct family of sauropodomorph dinosaurs from the Late Triassic Period. It contains the genera Riojasaurus and Eucnemesaurus. The Riojasauridae is considered a stem taxon, and is defined as "the most inclusive clade containing Riojasaurus incertus but not Plateosaurus engelhardti, Massospondylus carinatus, or Anchisaurus polyzelus". Geologic formations containing riojasaurid fossils include the Lower Elliot Formation of Orange Free State, South Africa, and the Los Colorados Formation, in La Rioja Province, Argentina.

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