I was in Philadelphia and New York last week, visiting colleagues on the East Coast and getting in some collaborative research. Much more to say about that in the future – even just the touristy stuff will fill several posts.

One highlight of the trip was visiting the Academy of Natural Sciences in Philadelphia last Friday. Ted Daeschler (of Tiktaalik fame) and Jason Poole (who illustrated this sweet book) were my generous hosts and I got to see a ton of cool stuff both out on exhibit and behind the scenes. Seriously, I could post for a month just on the Academy visit.

A personal highlight for me was seeing the cervical vertebrae of the sauropod dinosaur Suuwassea on exhibit. They are in a glass case and you can get around them pretty well to see a lot of anatomy. At first I was pumped to get nice color photos of all the vertebrae from up close and from multiple angles. Then I thought, “Huh, maybe I should just shoot a video.” So I did. Here you go, four minutes of hot sauropod vertebra action:

Plateosaurus engelhardti (originally P. trossingensis) SMNS 13200 cervical vertebrae 3-8 in left lateral view. C8 is roughly 15 cm long.

In the recent post on serial variation in sauropod cervicals, I wrote:

Even in ‘adult’ sauropods like the big mounted Apatosaurus and Diplodocus skeletons, the anterior cervicals are less complex than the posterior ones. Compared to posterior cervicals, anterior cervicals tend to have simpler pneumatic fossae and foramina, fewer laminae, and unsplit rather than bifid spines. In all of these things the anterior cervicals are similar to those of juveniles of the same taxa, and to those of adults of more basal taxa. This is also true in prosauropods–in Plateosaurus, the full complement of vertebral laminae is not present until about halfway down the neck.

I was working from memory there and actually understated things a bit. Plateosaurus presacral vertebrae don’t have well-developed spinal laminae, but they do eventually get the four major diapophyseal laminae–the anterior centrodiapophyseal lamina (ACDL), posterior centrodiapophyseal lamina (PCDL), prezygodiapophyseal lamina (PRDL), and postzygodiapophyseal lamina (PODL–please see the lamina tutorial if you need a refresher on these and the other 15 commonly identified laminae). But they aren’t all present halfway down the neck–the ACDL doesn’t really show up until the cervicodorsal transition. The other three kick in sequentially down the neck, as shown in the above image. I think that’s pretty cool, that you get different character states expressed at different points along the neck, in one individual organism, at one time. And possibly also at different times–in sauropods, the anterior cervicals tend to look more ‘juvenile’ or ‘primitive’, even in adult animals, so all of the cervicals go through a juvenile stage, but not all of them grow out of it. I don’t know if there’s a word for that–some kind of serial heterochronotopomorphy or the like–but hopefully someone will enlighten me.

I took the original photo in the collections at the Staatliches Museum für Naturkunde Stuttgart in the spring of 2004. Markus Moser and Rainer Schoch were wonderful hosts during my visit. Mike did all the work of turning the raw photo into a figure, so thanks to him for getting this off my hard drive and out into the world.