Chaoyangsauridae

Chaoyangsauridae; Temporal range: Late Jurassic, 160–148 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Compared close-up of the four so far known chaoyangsaurid genera, with pink representing known parts of skulls
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Neornithischia
Clade:	†Ceratopsia
Family:	†Chaoyangsauridae; Zhao, Cheng, & Xu, 1999
Type species
	†Chaoyangsaurus youngi; Zhao, Cheng, & Xu, 1999
Genera
	†Chaoyangsaurus; †Hualianceratops; †Stenopelix; †Xuanhuaceratops; †Yinlong;

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.

Four dinosaur genera, Chaoyangsaurus, Xuanhuaceratops, Yinlong and Hualianceratops, are usually considered to belong to the Chaoyangsauridae.^[1]^[2]^[3] In 2020, Yu et al. classified Stenopelix as a chaoyangsaurid.^[4] All five animals are more primitive (or basal) than both Psittacosaurus and neoceratopsians.

References

^ 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.
^ 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.
^ 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. S2CID 130791053.
^ Yu, Congyu; Prieto-Marquez, Albert; Chinzorig, Tsogtbaatar; Badamkhatan, Zorigt; Norell, Mark (2020-09-10). "A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia" (PDF). Communications Biology. 3 (1). doi:10.1038/s42003-020-01222-7. ISSN 2399-3642.

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[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. S2CID 130791053.

[4] Yu, Congyu; Prieto-Marquez, Albert; Chinzorig, Tsogtbaatar; Badamkhatan, Zorigt; Norell, Mark (2020-09-10). "A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia" (PDF). Communications Biology. 3 (1). doi:10.1038/s42003-020-01222-7. ISSN 2399-3642.

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See also

References