References
Reference
Storrs, Glenn W. (1999) An examination of Plesiosauria (Diapsida: Sauropterygia) from the Niabora Chalk (Upper Cretaceous) of central North America; The University of Kansas Paleontological Contributions, (11), pp.
An examination of Plesiosauria (Diapsida: Sauropterygia) from the Niabora Chalk (Upper Cretaceous) of central North America
Principal Author
Glenn W. Storrs
Header
Academic paper
Journal
The University of Kansas Paleontological Contributions
Issue
11
Abstract
�Detailed examination of the holotypes of all described plesiosaurs from the Niobrara Chalk reveals that only three of the nine named species can be retained as valid. Polycotylus latipinnis Cope, 1869 and Dolichothynchops osborni Williston, 1902 are based on adequate material and can be recognized as distinct species of polycotylid plesiosaur. Of the several elasmosaurian taxa from the Niobrara all save Styxosaurus snowii (Williston, 1890) are specifically nolidiagnostic; however, more than one genus may be represented by the existing material. Several holotypes once considered to be of Niobrara origin were actually collected from other units.
Language
English