Here’s a pretty cool image: Plate 7 from Lull (1919), showing the partial skeleton of Barosaurus YPM 429 (above), compared to the much more complete skeleton of Diplodocus CM84/94 (below). I’ve been pretty familiar with that Barosaurus skeleton diagram since I was about 9 years old, because it’s in Donald Glut’s New Dinosaur Dictionary , which I’ve written about here before.

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Ray Wilhite posted this gorgeous image on a Facebook thread, and we’re re-posting it here with his permission.

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In a comment on the last post, Mike wrote, “perhaps the pneumaticity was intially a size-related feature that merely failed to get unevolved when rebbachisaurs became smaller”. {.wp-image-6447 .size-large aria-describedby=“caption-attachment-6447” loading=“lazy” attachment-id=“6447” permalink=“http://svpow.com/2012/06/28/hot-sauropod-news-part-1-rampant-pneumaticity-in-saltasaurines/caudal-pneumaticity-in-saltasaurines-cerda-et-al-2012-fig-1/”

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If you’ve been here for very long you know I have a bit of a neural canal fixation.

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