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Chasmosaurus russelli

Reptilia - Ceratopsidae

Taxonomy
Chasmosaurus russelli was named by Sternberg (1940). Its type specimen is NMC 8800, a skull, and it is not a trace fossil. Its type locality is Southeast of Manyberries (NMC), which is in a Campanian terrestrial horizon in the Dinosaur Park Formation of Canada.

It was synonymized subjectively with Chasmosaurus belli by Lehman (1998).

Synonyms
Synonymy list
YearName and author
1940Chasmosaurus russelli Sternberg p. 478 figs. 6-7
1964Chasmosaurus russelli Kuhn p. 56
1964Chasmosaurus russelli Russell p. 13
1966Chasmosaurus russelli Russell p. 24
1989Chasmosaurus russelli Lehman p. 139
1990Chasmosaurus russelli Dodson and Currie p. 612
1990Chasmosaurus russelli Lehman p. 225
1993Chasmosaurus russelli Forster and Sereno p. 14
1995Chasmosaurus russelli Godfrey and Holmes p. 728
2001Chasmosaurus russelli Eberth et al. p. 59
2004Chasmosaurus russelli Dodson et al. p. 496
2005Chasmosaurus russelli Currie p. 4
2005Chasmosaurus russelli Diem and Archibald p. 251
2005Chasmosaurus russelli Ryan and Evans p. 325
2006Chasmosaurus russelli Campione and Holmes p. 1014
2006Chasmosaurus russelli Lucas et al. p. 368
2007Chasmosaurus russelli Farke p. 249
2007Chasmosaurus russelli Ryan p. 390
2008Chasmosaurus russelli Hunt and Lehman p. 1132
2008Chasmosaurus russelli Longrich p. 994
2010Chasmosaurus russelli Longrich p. 683
2010Mojoceratops perifania Longrich pp. 683-684 figs. 3-8
2010Chasmosaurus russelli Ryan et al. p. 185
2011Chasmosaurus russelli Eberth and Evans p. 20
2011Mojoceratops perifania Farke p. 7
2011Mojoceratops perifania Farke et al. p. 692
2011Chasmosaurus russelli Farke et al. p. 693
2011Chasmosaurus russelli Maidment and Barrett p. 5
2013Mojoceratops perifania Loewen et al. p. 501
2013Mojoceratops perifania Longrich p. 53
2013Chasmosaurus russelli Longrich p. 60
2014Chasmosaurus russelli Currie and Koppelhus p. 1036
2014Mojoceratops perifania Currie and Koppelhus p. 1036
2014Mojoceratops perifania Longrich p. 292
2015Chasmosaurus russelli Konishi p. 609
2016Chasmosaurus russelli Campbell et al. p. 34–35
2016Mojoceratops perifania Mallon et al. p. 5
2016Chasmosaurus russelli Mallon et al. p. 17

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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()
familyCeratopsidae
subfamilyChasmosaurinae
genusChasmosaurus
speciesrusselli

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.

†Chasmosaurus russelli Sternberg 1940
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Invalid names: Mojoceratops perifania Longrich 2010 [synonym]
Diagnosis
ReferenceDiagnosis
N. R. Longrich 2010Chasmosaurus exhibiting the following combination of characters: (1) lateral rami of parietal posterior bar weakly arched in dorsal view, (2) well-developed caudal emargination of the frill, with an angle between the lateral rami of 120°, (3) three broad, moderately elongate parietal epoccipitals.
N. R. Longrich 2010 (Mojoceratops perifania)Chasmosaurine ceratopsid characterized by the following characters: (1) lateral rami of the parietal posterior bar bearing a prominent sulcus on their anterior surface, (2) lateral rami of the parietal posterior bar with a thickened anterodorsal edge, bearing node-like swellings, (3) parietal epoccipital 1 bearing a medial accessory process, (4) lateral rami of the parietal posterior bar anteroposteriorly narrow and dorsoventrally thickened, giving them a rod-like shape, (5) a strongly notched caudal margin of the parietals, with the lateral rami diverging at an angle of no more than 105°, (6) strongly arched lateral rami of the parietal posterior bar, giving the posterior bar a distinctive ‘m’ shape, and extending the parietals well beyond the squamosals, (7) parietal epoccipitals project caudally from the parietal (8) parietosquamosal frill erect, long axis of the parietal forming an angle of about 45° with horizontal, (9) parietal fenestrae anteriorly extended towards the supratemporal fossae to a degree not seen in Chasmosaurus, (10) triangular postfrontal fontantelle with strong transverse expansion, (11) prominent supraorbital horns, length exceeding 200% of basal diameter, (12) supraorbital horns oriented dorsolaterally, being inclined away from the vertical plane by 45° in anterior view, (13) epijugal ossification prominent and subconical. Characters 1–3 are autapomorphies Mojoceratops, characters 4 and perhaps 9 are derived characters unique to Mojoceratops and Agujaceratops. Characters 1–13 distinguish Mojoceratops from the co-occurring Chasmosaurus. Agujaceratops can be differentiated from Mojoceratops by the absence of characters 1–3, by the erect supraorbital horncores, by the fan-shaped squamosal, by the high number of squamosal epoccipitals (up to 10) (Forster, et al., 1993) and by the elongate squamosal epoccipitals (Lehman, 1989).
S. C. R. Maidment and P. M. Barrett 2011Taxon displaying the combination of characters unique to the genus Chasmosaurus along with the following features: (1) parietal posterior bar bearing a median emargination and is broadly arched either side so that it forms an ‘M’ shape with the parietal median bar; (2) each side of the posterior parietal bar bears three roughly equally sized epiparietals (after Godfrey & Holmes, 1995). Both characters are autapomorphic for C. russelli within Chasmosaurus.
J. A. Campbell et al. 2016Medial margin of posterior parietal bar moderately to deeply embayed, with the two halves of the bar forming an angle of between 89° and 128° at the midline.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Entire body: yesg
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialsubo
Locomotion: actively mobileo
Life habit: ground dwellingsubo
Diet: herbivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-08-25 05:45:37
Modified: 2005-08-25 07:45:37
Source: g = genus, subo = suborder, o = order
References: Norman and Weishampel 1991, Peczkis 1995, Marsh 1875

Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Campanian83.5 - 70.6Canada (Alberta) Chasmosaurus belli (45731) Chasmosaurus russelli (type locality: 64400) Chasmosaurus sp. (191255)
Middle Campanian - Late/Upper Campanian83.5 - 70.6Canada (Alberta) Chasmosaurus russelli (64402)