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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Chaoyangsauridae
It was reranked as the family Chaoyangsauridae by Zhao et al. (2006), Han et al. (2015) and Zheng et al. (2015).
It was assigned to Pachycephalosauria by Zhao (1983); and to Ceratopsia by Zhao et al. (2006), Han et al. (2015) and Zheng et al. (2015).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|F. Han et al. 2015||Chaoyangsaurids may be distinguished from other ceratopsians by the following synapomorphies: semicircular ventral process near the medial face of the mandibular
glenoid , expanded, flat dorsal surface of the squamosal with a stalked quadrate process, deep sulcus dividing the quadrate condyles, ventral margin of the angular extending laterally to form a ridge with a distinct concavity formed above the ridge, predentary reduced and much shorter than premaxillary oral margin, dorsal and ventral margin of the dentary converged rostrally more than 20% of the depth.