Dystylosaurus edwini (“Edwini” is Ed Colbert, a wonderful mentor who helped age and mature dad as he flailed about on his way to wherever it was he was going.)
Saurischia Sauropodomorpha Sauropoda Brachiosauridae
Morrison Formation, Colorado, US
Dystylosaurus > D.edwini
D.edwini is based on a very large cranio-middle dorsal from the same site as the above. It is also clearly brachiosaurid. Compared to the seventh dorsal forward from the sacrum of Brachiosaurus, the Distylosaurus centrum is shorter and has a smaller pleurocoel. (The image is a dorsal vertebra not unlike the one just described.)
The transverse process is similarly directed straight outward but appears more massive, in part perhaps because most of the laminae in the former have been severely damaged and are largely restored in plaster.
The three major differences pertain to the spine, which in Dystylosaurus is broader transversely, much shorter axially, and noticeably lower than would be expected