A nice pneumatic Allosaurus cervical dorsal

October 12, 2019

Spotted this beauty in the collections at Dinosaur Journey this past summer. With the front end of the centrum blown off, taphonomy once again proves to be the poor man’s CT machine, giving us a great look at the pneumatic spaces inside the vertebra.

EDIT, Oct. 13, 2019 — WHOOPS! That ain’t a cervical. Based on the plates in Madsen (1976), it’s a dead ringer for the second dorsal vertebra.

Allosaurus fragilis cervicodorsal transition - Madsen 1976 plates 14-16

Vertebrae C7 through D3 of Allosaurus fragilis in anterior view, from plates 14-16 in Madsen (1976). Abbreviations: dp, diapophysis; li, interspinous ligament scar; nc, neural canal; ns, neural spine; pp, parapophysis; pr, prezygapophysis.

Reference

Madsen, Jr., J.H. 1976. Allosaurus fragilis: a revised osteology. Utah Geological and Mining Survey Bulletin 109: 1-163.

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