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Montanoceratops cerorhynchus

Reptilia - Leptoceratopsidae

Taxonomy
Leptoceratops cerorhynchus was named by Brown and Schlaikjer (1942). Its type specimen is AMNH 5464, a skeleton, and it is a 3D body fossil. Its type locality is 3 miles west of Buffalo Lake, which is in a Maastrichtian terrestrial horizon in the St. Mary River Formation of Montana.

It was recombined as Montanoceratops cerorhynchus by Sternberg (1951), Kuhn (1964), Russell (1964), Maryanska and Osmólska (1975), Dodson and Currie (1990), Chinnery and Weishampel (1996), Vickaryous and Ryan (1997), Chinnery and Weishampel (1998), Makovicky (2001), Chinnery (2004), You and Dodson (2004), Makovicky (2010), Ryan et al. (2012) and Son et al. (2022).

Synonymy list
YearName and author
1942Leptoceratops cerorhynchus Brown and Schlaikjer p. 2
1946Leptoceratops cerorhynchus Gray p. 800
1949Leptoceratops cerorhynchus Lull and Gray pp. 494-495
1951Montanoceratops cerorhynchus Sternberg p. 227
1964Montanoceratops cerorhynchus Kuhn p. 54
1964Montanoceratops cerorhynchus Russell p. 16
1975Montanoceratops cerorhynchus Maryanska and Osmólska p. 170
1990Montanoceratops cerorhynchus Dodson and Currie p. 611
1996Montanoceratops cerorhynchus Chinnery and Weishampel p. 27A
1997Montanoceratops cerorhynchus Vickaryous and Ryan p. 491
1998Montanoceratops cerorhynchus Chinnery and Weishampel p. 569
2001Montanoceratops cerorhynchus Makovicky p. 254
2004Montanoceratops cerorhynchus Chinnery p. 572
2004Montanoceratops cerorhynchus You and Dodson p. 480
2010Montanoceratops cerorhynchus Makovicky pp. 69-70
2012Montanoceratops cerorhynchus Ryan et al. p. 69
2022Montanoceratops cerorhynchus Son et al. p. 7

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
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()
infraorderNeoceratopsia
—Coronosauria
familyLeptoceratopsidae()
genusMontanoceratops
speciescerorhynchus()

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.

†Montanoceratops cerorhynchus Brown and Schlaikjer 1942
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Diagnosis
ReferenceDiagnosis
B. Brown and E. M. Schlaikjer 1942Nasal proportionately large, deep, heavy and with a very well-developed horn-core. Dentary long and with a straight ventral margin.