Barosaurus lentus AMNH 6341 dorsal sequence
April 18, 2012
I’ve been thinking about Barosaurus lately.
<homer>Mmmm … Barosaurus …</homer>
The best (and only, really) good recent treatment of Barosaurus is in John McIntosh’s chapter of the 2005 IUP Thunder Lizards volume. The main weakness of that chapter is that, while a lot of material is illustrated, the figures are rather small and not particularly well reproduced — and, in the case of the two-page spread of dorsal vertebrae, monumentally confusing:
Quick! find the fourth dorsal in posterior view! [˙ʇɟǝן ɯoʇʇoq ʇɐ s,ʇı :ɹǝʍsuɐ]
To get a better sense of the variation along the column, I scanned the two pages, loaded them into GIMP, joined them together, cleaned up the “white” of the background while retaining all the contrast I could, then moved each of the 27 illustrations to its own layer. Then I was able to rearrange them to my liking, align them, and produce this modified version:
So here it is for anyone else who finds it useful.
(One character that varies sequentially is of course the degree of neural spine bifurcation. But we won’t be flogging that dead horse any more — we’re done blogging, and the paper is in prep.)
- McIntosh, J.S. 2005. The genus Barosaurus Marsh (Sauropoda, Diplodocidae); pp. 38-77 in Virginia Tidwell and Ken Carpenter (eds.), Thunder Lizards: the Sauropodomorph Dinosaurs. Indiana University Press, Bloomington, Indiana, 495 pp.