First caudal vertebrae of the various Haplocanthosaurus specimens

August 3, 2018

CM 879 caudal 1 in anterior view

Here’s caudal 1 in Haplocanthosaurus priscus, CM 879. Hatcher (1903) only illustrated this vert in right lateral view, in a drawing by Sydney Prentice (see this post). I showed the vert in left lateral, right lateral, and dorsal views in my 2009 air sac paper (figs. 7 and 9, here). As far as I know, no-one has ever illustrated this vert in anterior or posterior view before.

CM 879 caudal 1 in posterior view

That’s a shame, because it’s the only first caudal of Haplocanthosaurus with a combination of good preservation and accessibility. The first caudal of the holotype, CM 572, was pretty wrecked and the drawings of it in Hatcher (1903) are largely reconstructions (this is discussed in McIntosh and Williams 1988). H. delfsi, CMNH 10380, has a nice caudal 1 but it’s stuck way up in the air in the mounted skeleton in Cleveland. The Snowmass Haplo, MWC 8028, includes a probable first caudal but it’s not going to win any beauty contests:

MWC 8028 probable caudal 1 in anterior (left), posterior (middle), and right lateral (right) views. From Foster and Wedel (2014: fig. 5).

Oh, and there’s the Bilbey haplocanthosaur on display at the Utah Field House of Natural History State Park Museum in Vernal. It has a very nice caudal sequence, probably the best for any haplocanthosaur, but (1) the specimen is under study by others so I don’t want to say too much about it, and (2) I couldn’t if I wanted to because the caudals are displayed in such a way that only the centra are easily visible.

I intended to talk a bit about the morphology of the first caudal in CM 879 and the other Haplo specimens, but now I’m out of time, so I’ll have to circle back to that in the future.



One Response to “First caudal vertebrae of the various Haplocanthosaurus specimens”

  1. […] blooded fish? (Time Scavengers) First caudal vertebrae of the various Haplocanthosaurus specimens (SVPOW) The Haplo project enjoys a brief interlude in realspace (SVPOW) Ingentia: Prehistoric Beast of the […]

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