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Monoclonius

Reptilia - Ceratopsidae

Synonyms
Synonymy list
YearName and author
1876Monoclonius Cope
1877Monoclonius Cope p. 573
1883Monoclonius Cope p. 99
1889Monoclonius Cope
1889Monoclonius fissus Cope
1889Monoclonius recurvicornis Cope
1889Monoclonius sphenocerus Cope
1889Monoclonius recurvicornis Cope p. 716
1889Monoclonius sphenocerus Cope p. 716
1889Monoclonius fissus Cope p. 717
1889Monoclonius Cope p. 906
1892Monoclonius sphenocerus Cope p. 757
1892Monoclonius Seeley
1895Monoclonius Marsh
1896Monoclonius recurvicornis Hatcher p. 113
1896Monoclonius Marsh p. 243
1902Monoclonius Hay p. 499
1902Monoclonius fissus Hay p. 500
1902Monoclonius recurvicornis Hay p. 500
1902Monoclonius sphenocerus Hay p. 500
1902Monoclonius Lambe p. 57
1902Monoclonius recurvicornis Lambe p. 68
1902Monoclonius sphenoceras Lambe p. 68
1905Ceratops recurvicornis Hatcher
1905Monoclonius Lambe p. 3
1905Monoclonius fissus Lambe p. 24
1905Monoclonius recurvicornis Lambe p. 24
1905Monoclonius sphenocerus Lambe p. 24
1905Monoclonius Lambe p. 49
1906Monoclonius Lull p. 144
1907Monoclonius Hatcher et al. p. 12
1907Monoclonius sphenocerus Hatcher et al. pp. 87-88
1909Monoclonius Huene p. 17
1910Ceratops recurvicornis Lull p. 772
1911Monoclonius Lambe p. 9
1911Monoclonius von Zittel p. 296
1913Monoclonius sphenocerus Lambe p. 115
1913Agathaumas sphenoceros Tornier p. 375 fig. 53
1914Ceratops recurvicornis Brown p. 549
1915Styracosaurus sphenocerus Lambe p. 18
1915Monoclonius Matthew p. 30
1917Monoclonius Brown p. 285
1922Monoclonius Joleaud p. 64
1924Monoclonius Abel p. 712
1924Monoclonius Lull p. 245
1925Monoclonius Gregory and Mook p. 6
1927Monoclonius Huene p. 259
1927Ceratops recurvicornis Huene p. 261
1927Monoclonius sphenocerus Huene p. 261
1928Monoclonius Nopcsa p. 185
1929Monoclonius Nopcsa p. 69ff
1930Ceratops recurvicornis Arldt p. 702
1930Ceratops recurvicornis Russell p. 142
1930Monoclonius Russell p. 142
1930Monoclonius sphenocerus Russell p. 142
1933Monoclonius Lull p. 81
1933Monoclonius recurvicornis Lull p. 83
1933Monoclonius sphenocerus Lull p. 83
1934Monoclonius Chakravarti p. 78
1938Centrosaurus recurvicornis Sternberg p. 286
1938Monoclonius sphenocerus Sternberg p. 286
1940Centrosaurus recurvicornis Sternberg p. 468
1940Monoclonius Sternberg p. 468
1940Monoclonius sphenocerus Sternberg p. 468
1949Monoclonius Sternberg p. 41 fig. 1
1950Monoclonius Huene p. 351
1956Monoclonius Romer p. 639
1963Monoclonius Parsch p. 8
1964Monoclonius Kuhn p. 57
1964Monoclonius fissus Kuhn p. 57
1964Monoclonius recurvicornis Kuhn p. 57
1964Monoclonius sphenocerus Kuhn p. 57
1964Ceratops recurvicornis Russell p. 10
1964Monoclonius sphenocerus Russell p. 10
1964Monoclonius Tatarinov p. 583
1966Monoclonius Romer p. 371
1970Monoclonius Swinton p. 259
1973Monoclonius Powell p. 118
1980Monoclonius Molnar p. 138
1980Monoclonius Wolberg p. 42
1983Monoclonius Dodson p. 94
1984Monoclonius Russell p. 25
1986Monoclonius Clemens p. 80
1986Monoclonius Ostrom and Wellnhofer p. 116
1988Monoclonius Carroll
1990Monoclonius Dodson p. 241
1990Monoclonius Dodson and Currie p. 611
1990Monoclonius Lehman p. 212
1997Monoclonius Dodson p. 12
1997Monoclonius Eberth p. 202
2004Monoclonius Dodson et al. p. 495

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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()
RankNameAuthor
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
Clypeodonta
Cerapoda
Marginocephalia
Ceratopsia()
infraorderNeoceratopsia
Coronosauria
familyCeratopsidae
subfamilyCentrosaurinae
genusMonoclonius

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
B. Brown 1917Skull small to medium sized with three horns; nasal horn large, curved or straight, rising from middle of nasals immediately above the posterior border of the nares; supraorbital horns small or incipient. Nasals large; nares nearly separated by osseous septum formed by premaxillaries and nasals. Premaxilaries deep with vertical plate forming septum non-fenestrated. Crest composed of short, broad squamosals and extension of elongate coossified postfrontals or derm-supraoccipitals (parietals) perforated by large fenestrae; each fenestra wholly within the boundary of the derm-supraoccipitals. Margin of crest crenulated, each prominence bearing a separate ossification. A pair of long curved hook-like processes on posterior border of derm-supraoccipitals, orbit round, eye with sclerotic bony plates.