Chasmosaurus belli Lambe, 1902

Maidment, Susannah C. R. & Barrett, Paul M., 2011, A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs, Zootaxa 2963, pp. 1-47 : 4-5

publication ID

https://doi.org/ 10.5281/zenodo.278172

DOI

https://doi.org/10.5281/zenodo.3513884

persistent identifier

https://treatment.plazi.org/id/03E33412-F777-7335-FF66-FA8DED5150B1

treatment provided by

Plazi

scientific name

Chasmosaurus belli Lambe, 1902
status

 

Chasmosaurus belli Lambe, 1902

Monoclonius belli Lambe 1902: 59 View Cited Treatment

Monoclonius canadensis Lambe 1902: 63 View Cited Treatment Ceratops belli Hatcher et al. 1907: 97

Ceratops canadensis Hatcher et al. 1907: 97 Protorosaurus belli Lambe 1914: 131

Chasmosaurus belli Lambe 1914: 149

Eoceratops canadensis Lambe 1915: 2

Chasmosaurus kaiseni Brown 1933: 2

Chasmosaurus brevirostris Lull 1933: 94 Chasmosaurus canadensis Lehman 1989: 139

Amended diagnosis. Taxon displaying the combination of characters unique to the genus Chasmosaurus along with the following features: (1) parietal posterior bar bearing no median emargination and is nearly straight so that it forms a ‘T’ shape with the parietal median bar; (2) lateral pair of epiparietals large and triangular; others, when preserved, are smaller (after Godfrey & Holmes 1995). Both characters are autapomorphic for C. belli within Chasmosaurus .

Holotype. CMN 491, a partial parietal. Although fragmentary, the holotype is diagnostic based on the combination of generic character 4, and specific character 1, a combination not observed in any other chasmosaurine. Distribution. Middle and upper beds of the Dinosaur Park Formation, Alberta, Canada ( Ryan & Evans 2005).

Referred specimens. CMN 2245; AMNH 5402; ROM 843; YPM 2016; NHMUK R4948 (after Ryan & Evans 2005). The NHMUK specimen is referred to Chasmosaurus because it possesses characters 1, 3, 4 and 5 from the diagnosis of Chasmosaurus (above); it is referred to C. belli because it possesses character 1 from the diagnosis of C. belli (above).

Specimens removed from C. belli . ROM 839 was referred to C. belli by Ryan and Evans (2005) and Longrich (2010), but is not diagnosable to species level based on the amended diagnosis presented here and represents Chasmosaurus sp.

CMN

Canadian Museum of Nature

AMNH

American Museum of Natural History

ROM

Royal Ontario Museum

YPM

Peabody Museum of Natural History

NHMUK

Natural History Museum, London

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Ornithischia

Family

Ceratopsidae

Genus

Chasmosaurus

Loc

Chasmosaurus belli Lambe, 1902

Maidment, Susannah C. R. & Barrett, Paul M. 2011
2011
Loc

Chasmosaurus kaiseni

Brown 1933: 2
1933
Loc

Chasmosaurus brevirostris

Lehman 1989: 139
Lull 1933: 94
1933
Loc

Eoceratops canadensis

Lambe 1915: 2
1915
Loc

Ceratops canadensis

Hatcher 1907: 97
1907
Loc

Monoclonius belli

Lambe 1902: 59
1902
Loc

Monoclonius canadensis

Hatcher 1907: 97
Lambe 1902: 63
1902
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