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Varanops brevirostris (Eupelycosauria: Varanopidae) from the Lower Permian of Texas, with discussion of varanopid morphology and interrelationships
University of Toronto at Mississauga, Mississauga, Ontario, Canada.
University of Toronto Mississauga.
2010 (English)In: Journal of Vertebrate Paleontology, ISSN 0272-4634, Vol. 30, no 3, 724-746 p.Article in journal (Refereed) Published
Abstract [en]

A comprehensive revision of Varanops brevirostris on the basis of a large, well-preserved specimen from a new Lower Permian locality in Texas provides valuable new anatomical information and additional autapomorphies for this varanopid synapsid taxon. These include the loss of the postorbital boss, the presence of a smooth transition between the dorsal and lateral surfaces of the postorbital, hypertrophied basipterygoid processes, the presence of deep, elongate lateral neural spine excavations, posterior dorsal vertebrae with dorsally tapered neural spines, and a deep groove proximal to the femoral fourth trochanter. Furthermore, this specimen is the first fully developed adult specimen of Varanops, and it preserves the most complete lower jaw of the taxon. A revised phylogenetic analysis places V. brevirostris as the sister taxon to the Varanodon-Watongia clade. A stratocladistic analysis assessing varanopid relationships by incorporating a stratigraphic character into the analysis recovers the same topology among varanodontines, but an alternate topology between mycterosaurines and Elliotsmithia longiceps.

Place, publisher, year, edition, pages
2010. Vol. 30, no 3, 724-746 p.
National Category
Evolutionary Biology Zoology
Research subject
Biology with specialization in Evolutionary Organismal Biology
URN: urn:nbn:se:uu:diva-217232DOI: 10.1080/02724631003762914ISI: 000278000900009OAI: oai:DiVA.org:uu-217232DiVA: diva2:692565
Available from: 2014-01-31 Created: 2014-01-31 Last updated: 2014-01-31Bibliographically approved

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Publisher's full texthttp://www.bioone.org/doi/abs/10.1080/02724631003762914

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Campione, Nicolas E.
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