from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Anatomy The superior or articular surface of the transverse process of a vertebra.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The dorsal transverse process of a vertebra
from the GNU version of the Collaborative International Dictionary of English
- n. The dorsal transverse, or tubercular, process of a vertebra. See vertebra.
from The Century Dictionary and Cyclopedia
- n. The transverse process proper of a vertebra; the lateral process from each side of the neural arch, paired with its fellow of the opposite side of the same vertebra.
* In tetrapods with two-headed ribs, the more ventral rib head contacts a facet on the vertebra known as the parapophysis (plural parapophyses), while the more dorsal rib head contacts a facet known as the diapophysis (plural diapophyses).
If this identification is right, then the diapophysis of MIWG. 7306 is uniquely odd, as it possesses a small rhomboidal opening near its (presumed) posterior border.
I thought later on that it might be a partial diapophysis*, as those of brachiosaurids can descend ventrally from the side of the centrum as plate-like processes with smoothly convex lateral surfaces.
I now have serious doubts about my identification of this object as a diapophysis, and I think that David was right with the neural spine identification.
: D, dorsal vertebra; di, diapophysis; pa, parapophysis; pcdl, posterior centrodiapophyseal lamina; poz, postzygapophysis; ppdl, paradiapophyseal lamina; prz, prezygapophysis. [planned for page width] doi: 10.1371/journal. pone.0009789.g004