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Pentaceratops sternbergii

Reptilia - Ceratopsidae

Taxonomy
Pentaceratops sternbergii was named by Osborn (1923). Its type specimen is AMNH 6325, a skull, and it is a 3D body fossil. Its type locality is Pentaceratops type, AMNH loc. 12863, which is in a Campanian terrestrial horizon in the Fruitland Formation of New Mexico.

It was corrected as Pentaceratops sternbergi by Longrich (2010).

Synonyms
Synonymy list
YearName and author
1923Pentaceratops sternbergii Osborn p. 3
1924Pentaceratops sternbergii Reeside, Jr. p. 21
1930Pentaceratops sternbergii Russell p. 156
1930Pentaceratops fenestratus Wiman p. 4
1930Pentaceratops sternbergii Wiman pp. 4-5
1933Pentaceratops sternbergii Lull p. 108
1933Pentaceratops fenestratus Lull p. 111
1935Pentaceratops fenestratus Gilmore p. 163
1935Pentaceratops sternbergii Gilmore p. 163
1942Pentaceratops fenestratus Wiman p. 237–238 fig. 1
1946Pentaceratops fenestratus Gray p. 797
1946Pentaceratops sternbergii Gray p. 797
1949Pentaceratops sternbergii Lull and Gray p. 496
1949Pentaceratops sternbergii Sternberg p. 42 fig. 1
1964Pentaceratops fenestratus Kuhn p. 58
1964Pentaceratops sternbergii Kuhn p. 58
1964Pentaceratops sternbergi Tatarinov p. 585
1964Pentaceratops fenestratus Tatarinov p. 587
1973Pentaceratops fenestratus Powell p. 118
1973Pentaceratops sternbergii Powell p. 118
1976Pentaceratops sternbergi Sloan p. 137
1980Pentaceratops sternbergii Wolberg p. 33
1981Pentaceratops sternbergii Mateer pp. 50-51
1981Pentaceratops sternbergii Rowe et al.
1984Pentaceratops sternbergii Hunt p. 83
1986Pentaceratops fenestratus Tokaryk p. 195
1989Pentaceratops sternbergii Lehman p. 157
1990Pentaceratops sternbergii Dodson and Currie p. 612
1990Pentaceratops sternbergii Lehman p. 225
1992Pentaceratops sternbergii Hunt and Lucas p. 231
1993Pentaceratops sternbergii Forster and Sereno p. 14
1993Pentaceratops sternbergii Hunt and Lucas p. 80
1997Pentaceratops sternbergii Ryan p. 257
1998Pentaceratops sternbergii Lehman p. 895
2003Pentaceratops sternbergii Sullivan and Lucas p. 102A
2004Pentaceratops sternbergii Dodson et al. p. 496
2004Pentaceratops sternbergi Farke p. 4
2004Pentaceratops sternbergii Sullivan and Lucas p. 120A
2005Pentaceratops sternbergi Diem and Archibald p. 254
2006Pentaceratops sternbergii Fowler and Sullivan p. 127
2006Pentaceratops sternbergii Lucas et al. p. 367
2007Pentaceratops sternbergi Ryan p. 392
2007Pentaceratops sternbergii Wu et al. p. 1260
2008Pentaceratops sternbergi Hunt and Lehman p. 1129
2010Pentaceratops sternbergi Longrich p. 681
2011Pentaceratops sternbergi Farke p. 4
2011Pentaceratops sternbergii Farke et al. p. 699
2011Pentaceratops sternbergii Sullivan and Lucas p. 431
2014Pentaceratops sternbergii Longrich p. 294–295
2016Pentaceratops sternbergii Lund et al. p. 6

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
RankNameAuthor
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
Clypeodonta
Cerapoda
Marginocephalia
Ceratopsia()
infraorderNeoceratopsia
Coronosauria
familyCeratopsidae
subfamilyChasmosaurinae
genusPentaceratops
speciessternbergii

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.

Diagnosis
ReferenceDiagnosis
T. M. Lehman 1998Large chasmosaurine with long, straight, and narrow squamosals possessing eight to 10 pronounced marginal undulations with or without attached epoccipitals, a slender strap-like parietal with indented medial posterior margin and large elongate fenestrae, two very large triangular posterior parietal epoccipitals and a pair of upturned epoccipitals on the midline dorsal surface of the posterior part of the parietal, large curved epijugal horncores with posteriorly directed jugals, large anteriorly curved supraorbital horncores arising directly over the orbits, and a deep face with fingerlike posterior process of the premaxillary on the nasal.
N. R. Longrich 2014Pentaceratops characterized by the following derived features: strong medial emargination of parietal, lateral rami of posterior bar meeting at an angle of 60, and with the
middle of the posterior bar lying ahead of the ends of the parietals. P1 curved anterodorsally to lie over frill; lateral episquamosals enlarged, >100 mm in length. Note that all of these features occur in Utahceratops gettyi.