Eighteen months ago, I noted that the Carnegie Museum’s Diplodocus mount has no atlantal ribs (i.e. ribs of the first cervical vertebra, the atlas). But that the Paris cast has long atlantal ribs — so long the extend past the posterior end of the axis. There were two especially provocative comments to that post. First, Konstantin linked to a photo of the Russian cast (first mounted in St. Petersburg but currently residing in Moscow).

My talk (Taylor et al. 2023) from this year’s SVPCA is up! The talks were not recorded live. But while it was fresh in my mind, I did a screencast of my own, and posted it on YouTube (CC By). For the conference, I spoke very quickly and omitted some details to squeeze it into a 15-minute slot. In this version, I go a bit slower and make some effort to ensure it’s intelligible to an intelligent layman. That’s why it runs 21 minutes.

Back into 2019, when Matt and I visited the Carnegie Museum, we were struck by how different the necks of juvenile and adult Tyrannosaurus rex individuals are. In particular, the juvenile individual known as Jane has a slender and amost fragile-looking neck compared with the monstrously robust neck of its adult counterpart.

Some quick backstory: lots of sauropods have long, overlapping cervical ribs, like the ones shown here in Sauroposeidon (diagram from this old post): {.size-large .wp-image-10817 .aligncenter loading=“lazy” attachment-id=“10817” permalink=“http://svpow.com/2014/09/22/wheelbarrow-handles-for-vertebrae-the-cervical-rib-bundles-of-sauroposeidon-and-other-sauropods/sauroposeidon-cervical-rib-cross-sections-v3/”

In a paper that I’m just finishing up now, we want to include this 1903 photo of Carnegie Museum personnel: {.alignnone .size-full .wp-image-20437 loading=“lazy” attachment-id=“20437” permalink=“http://svpow.com/2022/11/08/who-is-who-in-this-1903-carnegie-museum-photo/hatcher-et-al-in-lab-1903/” orig-file=“https://svpow.files.wordpress.com/2022/11/hatcher-et-al-in-lab-1903.jpg” orig-size=“2817,2285” comments-opened=“1”

This is a lovely cosmic alignment: right after the 15th anniversary of this blog, Mike and I have our 11th coauthored publication (not counting abstracts and preprints) out today. Taylor, Michael P., and Wedel, Mathew J. 2022. What do we mean by the directions “cranial” and “caudal” on a vertebra?

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I am co-authoring a manuscript that, among other things, tries to trace the history of the molds made by the Carnegie Museum in the early 1900s, from which they cast numerous replica skeletons of the Diplodocus carnegii mount (CM 84, CM 94, CM 307 and other contributing specimens). This turns out to be quite a mystery, and I have become fascinated by it. Below is the relevant section of the manuscript as it now stands.

I’ve been in contact recently with Matt Lamanna, Associate Curator in the Section of Vertebrate Paleontology at the Carnegie Museum of Natural History — which is obviously the best job in the world.

We’ve shown you the Apatosaurus louisae holotype mounted skeleton CM 3018 several times: shot from the hip, posing with another massive vertebrate, photographed from above, and more. Today we bring you a world first: Apatosaurus from below. Scroll and enjoy!