English: Illustration of the skull of Machaeroprosopus validus from "New or little known reptiles from the Trias of Arizona and New Mexico with notes from the fossil bearing horizons near Wingate, New Mexico" by Maurice Mehl, W.C. Toepelmann, and G.M. Schwartz (University of Oklahoma Bulletin103 :1-44).
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{{Information |Description ={{en|1=Illustration of the skull of ''Machaeroprosopus validus'' from "New or little known reptiles from the Trias of Arizona and New Mexico with notes from the fossil bearing horizons near Wingate, New Mexico" by Maurice...