That’s FMNH PR 25107, better known as a the holotype of Brachiosaurus altithorax — the biggest known dinosaur at the time of its description (Riggs 1903) and still for my money one of the most elegant, along with its buddy and one-time genus-mate Giraffatitan brancai.
I had a spare morning in Chicago two Tuesday ago, and Bill Simpson (collection manager of fossil vertebrates at the Field Museum) managed to fit it a collections visit for me at very short notice. I harvested some good science that morning — there’s a short Taylor and Wedel manuscript in review from that visit — but it would gave been churlish not to also take the opportunity to bathe in the sheer brachiosaurosity of it all.
Brachiosaurus altithorax holotype FMNH PR 25107 in collections at the Field Museum of Natural HIstory, Chicago. ” data-medium-file=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=300″ data-large-file=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=480″ class=”size-full wp-image-21173″ src=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=480&h=360″ alt=”" width=”480″ height=”360″ srcset=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=480&h=360 480w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=960&h=720 960w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=150&h=113 150w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=300&h=225 300w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161451772.jpg?w=768&h=576 768w” sizes=”(max-width: 480px) 100vw, 480px” />
Brachiosaurus altithorax holotype FMNH PR 25107 in collections at the Field Museum of Natural HIstory, Chicago. In the foreground, the femur. Behind it, at ground level, five of the seven presacral vertebrae and the sacrum; and on the shelf to the left, “Rib B”. On the top shelf, “Rib A”, the first two caudals and fragments of several more dorsal ribs. The remainder of the holotype (two more presacral vertebrae and the humerus) is on display in the public gallery.
I’m not too vain to take a selfie or two:
Me, with the 4th presacral vertebra of the Brachiosaurus altithorax holotype FMNH PR 25107 (i.e., the last-but-three dorsal vertebra), here seen in left posterolateral view. ” data-medium-file=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=225″ data-large-file=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=480″ class=”size-full wp-image-21175″ src=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=480&h=640″ alt=”" width=”480″ height=”640″ srcset=”https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=480&h=640 480w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=960&h=1280 960w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=113&h=150 113w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=225&h=300 225w, https://svpow.files.wordpress.com/2023/09/pxl_20230822_161550972.jpg?w=768&h=1024 768w” sizes=”(max-width: 480px) 100vw, 480px” />
Me, with the 4th presacral vertebra of the Brachiosaurus altithorax holotype FMNH PR 25107 (i.e., the last-but-three dorsal vertebra), here seen in left posterolateral view.
Oh look, there I am again!
“But tell me, Mike”, you ask: “Do they have a model skull based on that of Giraffatitan hidden away in collections?”
Why, yes! Yes, they do!
Yes, I have to admit it. Brachiosaurus taken as a whole may be as elegant as they come, but its skull taken alone is a minger. Forgive me. But it’s true.
Source:
https://svpow.com/2023/09/05/just-chillin-with-my-homie-fmnh-pr-25107/
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