“Apatosaurus” minimus sacrum/ilia: illustration from forthcoming description
July 1, 2012
I mentioned a few posts ago that Matt and I are working on a redescription of AMNH 675, a sauropod specimen referred by Mook (1917) to “Apatosaurus” minimus, but which everyone knows is not Apatosaurus. We plan to share the illustrations from this in-progress paper as we prepare them, so here is perhaps the key one:
The other material comprising this specimen consists of a partial pubis and two ischia, one of which is complete. We’ll show you these once we’ve prepared the illustrations.
What actually is it? Well, we don’t know yet. it has a strange mix of advanced diplodocoid and advanced macronarian features. A preliminary phylogenetic analysis is inconclusive. We have some more approaches to follow up before we’re ready to nail a conclusion to the door.
Mook, Charles C. 1917. Criteria for the determination of species in the Sauropoda, with description of a new species of Apatosaurus. Bulletin of the American Museum of Natural History 38:355-360.