Hey, look, a new sauropod vertebra to kick off the new year!

I’ve blogged a lot about the giant – and tiny – apatosaurines from the Morrison Formation of Oklahoma, and just once on Saurophaganax. But otherwise I don’t think I’ve covered any of the other Oklahoma Morrison dinos. So here’s a start: a pretty decent Camarasaurus dorsal. Broken transverse processes traced from Osborn and Mook (1921). Like all of the Oklahoma Morrison dinos, it’s from the quarries on or near Black Mesa, at the far northwestern corner of the Oklahoma panhandle.

Based on the narrowness of the neural arch and spine, I don’t think this vert can be any farther forward than D6 – anterior Cam dorsals are w-i-d-e. It would be odd for a camarasaur to have a spine split that deeply as far back as D10 or D11 (see Wedel and Taylor 2013). The centrum is very anteriorposteriorly short, which is a posterior dorsal character, but based on Osborn and Mook (1921) the centra can be this short as far forward as D6. So on the balance of the evidence, I think it’s probably a D6 or D7. But that is just an estimate, which might be off by a couple of positions either way.

Tons more that could be said about this specimen, but I’m going to play against type and not write a dissertation for a change. So, here’s OMNH 1811. We’ll probably come back to it at some point.