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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: †Ornithischia
Cladus: †Genasauria
Cladus: †Neornithischia
Cladus: †Cerapoda
Cladus: †Marginocephalia
Subordo: †Ceratopsia

Familia: †Chaoyangsauridae
Genera: †Chaoyangsaurus – †Hualianceratops – †Xuanhuaceratops – †Yinlong

Chaoyangsauridae Zhao, 1983: 300 ["Chaoyoungosauroidea"]

Chaoyangsauridae Zhao, Cheng, Xu & Makovicky, 2006: 467
Chaoyoungosauroidea Zhao, 1983: 300

Primary references

Zhao, X. 1983. Phylogeny and evolutionary stages of Dinosauria. Acta Palaeontologica Polonica 28(1-2): 295–306. PDF Reference page.
Zhao, X., Cheng, Z., Xu, X. & Makovicky, P.J. 2006. A New Ceratopsian from the Upper Jurassic Houcheng Formation of Hebei, China. Acta Geologica Sinica (English Edition) 80(4): 467–73. DOI: 10.1111/j.1755-6724.2006.tb00265.x ResearchGate Reference page.


Chaoyangsauridae – Taxon details on Fossilworks.

Vernacular names
中文: 朝陽龍科

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] All four animals are more primitive (or basal) than both Psittacosaurus and neoceratopsians.
See also

Timeline of ceratopsian research

Dinosaurs portal


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.

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