A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America
Identifieur interne : 000302 ( Istex/Checkpoint ); précédent : 000301; suivant : 000303A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America
Auteurs : Caleb Marshall Brown [Canada] ; Clint A. Boyd [États-Unis] ; Anthony P. Russell [Canada]Source :
- Zoological Journal of the Linnean Society [ 0024-4082 ] ; 2011-12.
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Abstract
A small, articulated basal ornithopod skeleton from the Frenchman Formation (late Maastrichtian) of Saskatchewan (RSM P 1225.1), previously referred to the taxon Thescelosaurus, differs from both recognized species of this taxon (Thescelosaurus neglectus and Thescelosaurus garbanii). The differences are taxonomically informative and we recognize this specimen as the holotype of a new species, Thescelosaurus assiniboiensis sp. nov., diagnosed by the presence of two autapomorphies, and displaying plesiomorphic traits more similar to those of Parksosaurus, than to those of the other Thescelosaurus species. The Frenchman Formation also harbours an intriguing faunal assemblage in which Thescelosaurus represents one of the most abundant dinosaur taxa, and preserves a relatively high proportion of small (putatively juvenile and subadult) specimens of many dinosaur taxa. Further work that increases the faunal sample from this formation, and that permits quantitative comparisons with contemporary formations, will determine whether or not these differences are well supported, and will determine their ultimate palaeobiological significance. Identification of a third species of Thescelosaurus from the late Maastrichtian of North America suggests that this taxon was more diverse than previously recognized, and shows an increase in diversity from the Campanian through the late Maastrichtian, contrasting the trends seen in most other ornithischian clades.
Url:
DOI: 10.1111/j.1096-3642.2011.00735.x
Affiliations:
- Canada, États-Unis
- Alberta, Texas
- Austin (Texas), Calgary
- Université de Calgary, Université du Texas à Austin
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The differences are taxonomically informative and we recognize this specimen as the holotype of a new species, Thescelosaurus assiniboiensis sp. nov., diagnosed by the presence of two autapomorphies, and displaying plesiomorphic traits more similar to those of Parksosaurus, than to those of the other Thescelosaurus species. The Frenchman Formation also harbours an intriguing faunal assemblage in which Thescelosaurus represents one of the most abundant dinosaur taxa, and preserves a relatively high proportion of small (putatively juvenile and subadult) specimens of many dinosaur taxa. Further work that increases the faunal sample from this formation, and that permits quantitative comparisons with contemporary formations, will determine whether or not these differences are well supported, and will determine their ultimate palaeobiological significance. Identification of a third species of Thescelosaurus from the late Maastrichtian of North America suggests that this taxon was more diverse than previously recognized, and shows an increase in diversity from the Campanian through the late Maastrichtian, contrasting the trends seen in most other ornithischian clades.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Alberta</li><li>Texas</li></region><settlement><li>Austin (Texas)</li><li>Calgary</li></settlement><orgName><li>Université de Calgary</li><li>Université du Texas à Austin</li></orgName></list><tree><country name="Canada"><region name="Alberta"><name sortKey="Brown, Caleb Marshall" sort="Brown, Caleb Marshall" uniqKey="Brown C" first="Caleb Marshall" last="Brown">Caleb Marshall Brown</name></region><name sortKey="Brown, Caleb Marshall" sort="Brown, Caleb Marshall" uniqKey="Brown C" first="Caleb Marshall" last="Brown">Caleb Marshall Brown</name><name sortKey="Russell, Anthony P" sort="Russell, Anthony P" uniqKey="Russell A" first="Anthony P." last="Russell">Anthony P. Russell</name></country><country name="États-Unis"><region name="Texas"><name sortKey="Boyd, Clint A" sort="Boyd, Clint A" uniqKey="Boyd C" first="Clint A." last="Boyd">Clint A. Boyd</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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