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Braincase of Mesozoic Birds: I. New Preparation of the "London" Archaeopteryx

K. N. Whetstone
Journal of Vertebrate Paleontology
Vol. 2, No. 4 (Feb., 1983), pp. 439-452
Stable URL: http://www.jstor.org/stable/4522915
Page Count: 14
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Braincase of Mesozoic Birds: I. New Preparation of the "London" Archaeopteryx
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Abstract

New preparation of the British Museum specimen of Archaeopteryx has exposed the left side of the braincase and the sagittal suture. The skull is much broader and more bird-like than earlier interpreted by deBeer (1954), supporting the estimates of brain size by Jerrison (1973). The braincase has an elongate laterosphenoid and parietal. There is no sagittal crest. The prootic is ventrolaterally depressed, with several pneumatic foramina. There is a single cotyle for the quadrate, formed by the otoccipital and prootic. The skull appears to have had a squamosal of unusual form. Arachaeopteryx differs from theropod dinosaurs in the morphology and position of the quadrate articulation, the structure of the prootic, and the morphology of the occiput.

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