5.6.4 Sacral vertebrae

Several separated sacral centra was accumulated (elizabeth.grams., PEFO 33875 and 33819), nevertheless sacral rib and you can sensory arc was broken away from. The amount of sacral vertebrae is determined to be two oriented on: (a) two collection of sacral rib scars towards the ilia out of Roentgen. callenderi; (b) two ankylosed centra (PEFO 36876) with obvious articulations to have ribs and you will sensory arches (Rates 8i–k); and you may (c) around seem to be only a couple of morphologies out-of sacral vertebrae one of the new separated specimens. The 2 ankylosed centra indicates that particular specimens off Roentgen. callenderi could possibly get coossify their sacral vertebrae and that this reputation is varying in the taxon. Because all of the specimens off PFV https://datingranking.net/tr/blendr-inceleme/ 297 try from equivalent size, it coossification in a number of specimens doesn’t appear to be dimensions related. Instead, due to the fact within the ventral view the horizontal expansions of one’s centra as much as this new ankylosed city aren’t perfectly symmetric, that it combination you will definitely represent a beneficial cystic and extra specimens are essential to confirm so it.

The fresh sacral centra is actually elongate and you may mediolaterally greater than just dorsoventrally tall, plus the centrum face is amphicoelous (Numbers 8i–k). The following sacral rib articulates with most of the horizontal facial skin of your own centrum and you will an element of the ventrolateral skin of one’s neural arc (PEFO 36876). In dorsal look at, the brand new sacral rib of your own second sacral vertebra expands considerably towards the an anteroposteriorly elongate articulation on the ilium (Shape 8l). Read more