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Tatankaceratops sacrisonorum

Osteichthyes - Ceratopsidae

Taxonomy
Tatankaceratops sacrisonorum was named by Ott and Larson (2010). Its type specimen is BHI-6226, a partial skeleton, and it is a 3D body fossil. Its type locality is Niemi Ranch, which is in a Maastrichtian crevasse splay mudstone in the Hell Creek Formation of South Dakota. It is the type species of Tatankaceratops.

Synonymy list
YearName and author
2010Tatankaceratops sacrisonorum Ott and Larson pp. 205-206 figs. 14.1-14.17
2011Tatankaceratops sacrisonorum Maidment and Barrett p. 3
2012Tatankaceratops sacrisonorum Longrich and Field p. 4
2014Tatankaceratops sacrisonorum Longrich p. 302

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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()
—Romeriida
RankNameAuthor
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Marginocephalia
—Ceratopsia()
familyCeratopsidae
subfamilyChasmosaurinae
—Triceratopsini
genusTatankaceratops
speciessacrisonorum

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.

†Tatankaceratops sacrisonorum Ott and Larson 2010
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Diagnosis
ReferenceDiagnosis
C. J. Ott and P. L. Larson 2010The new species is distinguishable from other late Maastrichtian ceratopsids based on its small adult size, lack of development of cornual sinuses, proportionally massive horncore, nasal horn the same length as post-orbital horns, nasal horncore recurved, proportionally large orbit compared to skull size, origination of postorbital horncores caudal to the orbit, no overlap of orbit by postorbital horncore, and no evidence of epijugal ossifications.