2007 GSA Denver Annual Meeting (2831 October 2007)
Paper No. 26-31
Presentation Time: 8:00 AM-12:00 PM

ANATOMY AND FUNCTION OF DIGIT III OF THE TYRANNOSAURUS REX MANUS

QUINLAN, Elizibeth D., DERSTLER, Kraig, and MILLER, Mercedes M., Paleontology, Fort Peck Paleontology Inc, P.O. Box 123, Fort Peck, MT 59223, fppi@nemontel.net

In northeastern Montana's Hell Creek formation, a Tyrannosaurus rex has been unearthed with three fingers on each hand. The existence of digit III had previously surmised because of a joint surface on the ulnar aspect of the base of metacarpal II. The phalanges of digit III and its metacarpal are fused into one slightly flexed unit, with proximal and radial joint surfaces. Sturdy dorsoulnar and volar muscle attachments are present on the base of the metacarpal. The anatomical findings suggest that the wrist of Tyrannosaurus rex had considerable power and that its hands could have been quite useful in stabilizing its prey or carrion.

2007 GSA Denver Annual Meeting (2831 October 2007)
General Information for this Meeting
Session No. 26--Booth# 105
Paleontology (Posters) I: Faunas, Forms, and Phylogenies
Colorado Convention Center: Exhibit Hall E/F
8:00 AM-12:00 PM, Sunday, 28 October 2007

Geological Society of America Abstracts with Programs, Vol. 39, No. 6, p. 77

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