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Chaoyangsauridae
Taxonomy
Chaoyoungosauroidea was named by Zhao (1983). Its type is Chaoyangsaurus.
It was reranked as the family Chaoyangsauridae by Zhao et al. (2006), Han et al. (2015), Zheng et al. (2015) and Morschhauser et al. (2019).
It was assigned to Pachycephalosauria by Zhao (1983); to Ceratopsia by Zhao et al. (2006), Han et al. (2015) and Zheng et al. (2015); and to Neoceratopsia by Morschhauser et al. (2019).
It was reranked as the family Chaoyangsauridae by Zhao et al. (2006), Han et al. (2015), Zheng et al. (2015) and Morschhauser et al. (2019).
It was assigned to Pachycephalosauria by Zhao (1983); to Ceratopsia by Zhao et al. (2006), Han et al. (2015) and Zheng et al. (2015); and to Neoceratopsia by Morschhauser et al. (2019).
Subtaxa
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1983 | Chaoyoungosauroidea Zhao p. 300 |
| 1985 | Xuanhuasaurus niei Zhao p. 289 |
| 2006 | Chaoyangsauridae Zhao et al. p. 467 |
| 2015 | Chaoyangsauridae Han et al. p. 3 |
| 2015 | Chaoyangsauridae Zheng et al. p. 6 fig. 3 |
| 2019 | Chaoyangsauridae Morschhauser et al. p. 129 fig. 10 |
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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.
Fm. †Chaoyangsauridae Zhao 1983
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G. †Chaoyangsaurus Zhao et al. 1999
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†Chaoyangsaurus youngi Zhao et al. 1999
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Invalid names: Chaoyangosaurus liaosiensis Zhao and Cheng 1983 [replaced]
Invalid names: Chaoyangosaurus Zhao and Cheng 1983 [replaced]
Invalid names: Xuanhuasaurus niei Zhao 1985 [nomen dubium]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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 [3], 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. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Norman and Weishampel 1991 | |||||
Age range: base of the Oxfordian to the top of the Late/Upper Berriasian or 163.50000 to 140.20000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian | China (Xinjiang) | Hualianceratops wucaiwanensis (175359) Yinlong downsi (72107) | |
| Late/Upper Kimmeridgian - Valanginian | China (Liaoning) | Chaoyangosaurus liaosiensis (10755) | |
| Late/Upper Kimmeridgian - Valanginian | China (Hebei) | Xuanhuaceratops niei (91320) | |
| Late/Upper Berriasian | Germany (Niedersachsen) | Stenopelix valdensis (69694) |