Sunday, November 13, 2005

Greater Ebay Sadness

After re-examining the picture of the Juvenile "T. rex" skull for sale on ebay, I have serious doubts that it is T. rex at all and not some other species; perhaps one new to science. My reasons are many. First of all, the area of the maxilla below the antorbital fenestra is much thicker in its inferior-superior aspect than well known adult specimens. Also, since the nasals and premaxilla is present, you can see that the nares are placed much to far superiorly with its posterior margin almost directly superior to the anterior margin of the maxilary finestra. In adults, the nares and the maxilary fenestra form an almost horizontal line. Because of the superior placement of the nares, the anterior portion of the premaxilla is not a thin splint as in adults and other tyrannosaurids (including juveniles) but rather a thick crest. The number of maxilary alveolae seems to be right, as are the shapes of both the antorbital and maxillary fenestrae. It seems to be lacking a distinctive pit in the corner of the lacrymal, but this could be age related. The inferior margin of the orbit is more constricted than in T. rex (though this could be due to the angle of the photo) but the postorbital seems to be equally robust. In all, the skull of this animal is boxier than adult T. rex which is contrary to current ideas about how tyrannosaurs aged in general. Typically they start out with very lean faces, which get boxier as they age. I propose that this is a new species of Tyrannosaurus which will never make it into the scientific literature. If T. rex was the wolf of the late cretaceous, then this was the bull dog.

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