English: A color-coded cranial diagram of Rugarhynchos sixmilensis. Dotted lines indicate missing bone, which was reconstructed based on Doswellia kaltenbachi. Some aspects of the morphology remain uncertain, such as the scaling and/or orientation of the premaxilla, quadrate, and quadratojugal. Note that bones of the mandible (dentary, angular, surangular, and articular) are featured in the legend but not illustrated as part of the diagram. Many thanks go to Brenen M. Wynd and Dr. Sterling J. Nesbitt, who provided helpful feedback in the creation of this diagram.