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Ichthyosaur (Ophthalmosauridae) from British Columbia



Ben Creisler
bcreisler@gmail.com

A new online paper:


Robin L. Sissons, Michael W. Caldwell, Carol A. Evenchick, Donald B.
Brinkman & Matthew J. Vavrek (2015)
An Upper Jurassic ichthyosaur (Ichthyosauria: Ophthalmosauridae) from
the Bowser Basin, British Columbia.
Canadian Journal of Earth Sciences, Published on the web 13 November 2015,
doi: 10.1139/cjes-2015-0103
http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0103?src=recsys#.VkgErHarTcs



Although the Jurassic was a period of high diversity in ichthyosaurs,
only a small number of specimens have been recorded from Canada to
date. We describe here a new occurrence of an ophthalmosaurid
ichthyosaur from a shallow marine depositional environment within the
Bowser Basin of northern British Columbia. Based on vertebral
diameters and the size of the humerus, the ichthyosaur was relatively
large compared to other contemporaneous forms, yet possessed teeth
that were small for its body size. As well, the height to length ratio
of the preserved vertebrae suggests it may have had a more elongate,
less regionalized body shape. Although indeterminate at a generic
level, the presence of Late Jurassic ichthyosaurs in nearshore waters
of northwestern North America further demonstrates their cosmopolitan
distribution.