Chaoyangsauridae

Chaoyangsauridae is a family of ceratopsian dinosaurs. They are among the earliest known marginocephalian dinosaurs, with remains dating to about 160 million years ago, during the Late Jurassic period. Members of this group had sharp beaks for snipping off leaves to eat, and a very small frill.

Chaoyangsauridae
Temporal range: Late Jurassic, 160–148 Ma
Compared close-up of the four so far known chaoyangsaurid genera, with pink representing known parts of skulls
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: †Ornithischia
Suborder: †Ceratopsia
Family: †Chaoyangsauridae
Zhao, Cheng, & Xu, 1999
Type species
†Chaoyangsaurus youngi
Zhao, Cheng, & Xu, 1999
Genera

Four dinosaur genera, Chaoyangsaurus, Xuanhuaceratops, Yinlong and Hualianceratops, are usually considered to belong to the Chaoyangsauridae.[1][2][3] All four animals are more primitive (or basal) than both Psittacosaurus and neoceratopsians.

References
  1. Zhao, X.; Cheng, Z.; Xu; Makovicky, P. J. (2006). "A new ceratopsian from the Upper Jurassic Houcheng Formation of Hebei, China". Acta Geologica Sinica. 80 (4): 467–473.
  2. Han, Fenglu; Forster, Catherine A.; Clark, James M.; Xu, Xing (2015). "A New Taxon of Basal Ceratopsian from China and the Early Evolution of Ceratopsia". PLOS ONE. 10 (12): e0143369. doi:10.1371/journal.pone.0143369. PMC 4674058. PMID 26649770.
  3. Han, Feng-Lu; Forster, Catherine A.; Clark, James M.; Xu, Xing (2016). "Cranial anatomy of Yinlong downsi(Ornithischia: Ceratopsia) from the Upper Jurassic Shishugou Formation of Xinjiang, China". Journal of Vertebrate Paleontology. 36: e1029579. doi:10.1080/02724634.2015.1029579.

See also


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