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Richard M. (2001). Coelophysis. ABDO Publishing Company. p. 16. ISBN 978-1-57765-488-9. Sulej T (2007). "Osteology, variability, and evolution of Metoposaurus...

Richard M. (2001). Coelophysis. ABDO Publishing Company. p. 4. ISBN 978-1-57765-488-9. Gay, R.J. (2001). "An unusual adaptation in the caudal vertebrae...