uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
A new species of mosasaur (Squamata: Mosasauridae) from the Pierre Shale (lower Campanian) of Manitoba
University of Calgary.
Canadian Museum of Nature.
Carleton Univ, Dept Earth Sci, Ottawa, Canada.
University of Alberta.
2007 (English)In: Canadian journal of earth sciences (Print), ISSN 0008-4077, Vol. 44, no 5, 593-606 p.Article in journal (Refereed) Published
Abstract [en]

Plioplatecarpus nichollsae, sp. nov., from the lower Campanian (Pembina Member, Pierre Shale Formation) is diagnosed by the following: a thickened ventral rim of the external naris, a short supratemporal fenestra, a frontal shield with well-developed posterolateral lappets that overlap the parietal dorsally, proximal rib shafts with an approximately circular (but not inflated) cross section, a scapula shaped as in other Plioplatecarpus species but approximately the same size (not larger) than the coracoid, and a moderately large parietal foramen that reaches the frontoparietal suture but does not invade the frontal. The last two characters require that the diagnosis of the genus Plioplatecarpus be emended. With other Plioplatecarpus species, P. nichollsae shares a robust humerus with a distal expansion at least as great as the total length of the bone, a rectangular preorbital frontal shield, a "peg and socket" postorbitofrontal-jugal articulation, a transversely directed ectopterygoid process of the pterygoid, a large, robust quadrate with a distinct eminence on the posterior surface of its shaft, an unossified gap in the ventral wall of the basioccipital, and at least 11 pygal vertebrae. P. nichollsae also shares primitive features with Platecarpus, as well as features apparently intermediate betweenPlatecarpus and Plioplatecarpus. Revision of the genus Platecarpus, currently hypothesized to be both paraphyletic and polyphyletic, as well as a better understanding of the early Campanian mosasaur fauna from the Morden area, are necessary before the phylogenetic significance of some of these characters, and therefore the relationships of Plioplatecarpus nichollsae, can be fully resolved.

Place, publisher, year, edition, pages
NRC Research Press, 2007. Vol. 44, no 5, 593-606 p.
National Category
Evolutionary Biology Zoology
Research subject
Biology with specialization in Evolutionary Organismal Biology
URN: urn:nbn:se:uu:diva-217235DOI: 10.1139/e07-006ISI: 000248272100002OAI: oai:DiVA.org:uu-217235DiVA: diva2:692573
Available from: 2014-01-31 Created: 2014-01-31 Last updated: 2014-01-31Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Campione, Nicolas E.
In the same journal
Canadian journal of earth sciences (Print)
Evolutionary BiologyZoology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 182 hits
ReferencesLink to record
Permanent link

Direct link