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Yamaceratops dorngobiensis

Osteichthyes

Taxonomy
Yamaceratops dorngobiensis was named by Makovicky and Norell (2006). Its type specimen is IGM 100/1315, a skull, and it is not a trace fossil. Its type locality is Khugenetjavkhlant, which is in a Santonian/Campanian alluvial fan sandstone in the Javkhlant Formation of Mongolia. It is the type species of Yamaceratops.

Synonymy list
YearName and author
2006Yamaceratops dorngobiensis Makovicky and Norell p. 2 figs. 1-19
2008Yamaceratops dorngobiensis Alifanov p. 622
2009Yamaceratops dorngobiensis Eberth et al. p. 295
2009Yamaceratops dorngobiensis Jin et al. p. 204
2010Yamaceratops dorngobiensis Amiot et al. p. 355
2014Yamaceratops dorngobiensis Tanoue and Okazaki p. 80
2015Yamaceratops dorngobiensis Han et al. p. 1
2015Yamaceratops dorngobiensis Varricchio et al. p. 1
2022Yamaceratops dorngobiensis Son et al. p. 6–7

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Marginocephalia
—Ceratopsia()
infraorderNeoceratopsia
genusYamaceratops
speciesdorngobiensis

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.

†Yamaceratops dorngobiensis Makovicky and Norell 2006
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Diagnosis
ReferenceDiagnosis
M. Son et al. 2022A neoceratopsian possessing the following autapomorphies: unkeeled rostral bone ventrally hooked and posteriorly expanded; the anteroventral margin of the fungiform anterior process of the lacrimal excluded from the antorbital fossa; jugal with its subtemporal ramus deeper than the suborbital ramus with an obtuse angle in between at the ventral edge. In addition, Yamaceratops dorngobiensis shares the following characters that are otherwise unique among basal neoceratopsians: a ventrally hooked rostral bone as in Aquilops americanus; a fungiform anterior process on the lacrimal as in Auroraceratops rugosus; a jugal with a deeper subtemporal ramus than the suborbital ramus as in Aquilops americanus, Liaoceratops yanzigouensis, and juvenile Protoceratops andrewsi; middle caudal neural spines about or more than four times as high as the centrum as in Koreaceratops hwaseongensis, Montanoceratops cerorhynchus, and Protoceratops andrewsi.