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Amazing Appalachiosaurus Arms
I recently came across the webpage for the McWane Science Center's exhibit on
Alabama dinosaurs (http://www.mcwane.org/exhibits/alabama_dinosaurs).
Unsurprisingly, Appalachiosaurus is the most prominently featured animal. At
the bottom of the page, there is a very intriguing video on the taxon,
prominently featuring its forearms.
The cast skeleton on display has incredibly elongate, robust, three-fingered
forearms. The arms are almost absurd; they seem proportionally longer than
those of any tyrannosauroid or carnosaur. This cast seems to be one from
Triebold Paleontology (featured at:
http://trieboldpaleontology.com/specimens/appalachiosaurus.html), so the arms
may well be standard issue for Appalachiosaurus casts.
The initial description certainly doesn't attribute forearm material to this
animal, and the paper's reconstruction looks like a relatively average
tyrannosaurid. Could this be a new speculation based on the purported basal
position of Appalachiosaurus in the Tyrannosauroidea, thus giving it more basal