One another PEFO 34561 and you will PEFO 34269 preserve limited next sacral vertebrae
5.six.cuatro Sacral backbone
Multiple separated sacral centra were amassed (age.g., PEFO 33875 and you may 33819), however the sacral rib and sensory arch is damaged away from. What number of sacral spinal vertebrae is decided to get several based on: (a) a couple of distinctive line of sacral rib scars with the ilia off R. callenderi; (b) a couple ankylosed centra (PEFO 36876) which have clear articulations to own ribs and you will sensory arches (Data 8i–k); and you may (c) around seem to be only several morphologies away from sacral spinal vertebrae certainly new remote specimens. The 2 ankylosed centra suggests that some specimens of R. callenderi will get coossify the sacral vertebrae which that it character is changeable in the taxon. Due to the fact all of the specimens regarding PFV 297 is actually out of equivalent size, which coossification in a few specimens doesn’t appear to be dimensions related. Rather, due to the fact during the ventral look at the lateral expansions of centra doing this new ankylosed area commonly well symmetrical, that it blend you may show a beneficial cystic and additional specimens are required to confirm it.
The sacral centra are elongate and you can mediolaterally large than dorsoventrally significant, and also the centrum confronts try amphicoelous (Numbers 8i–k). Next sacral rib articulates with most of one’s horizontal facial skin of the centrum and you can part of the ventrolateral surface of the sensory arch (PEFO 36876). In the dorsal view, brand new sacral rib of one’s second sacral vertebra increases significantly on the an anteroposteriorly elongate articulation toward ilium (Shape 8l). Inside the horizontal check, so it articulation surface is cigar-shaped; which articulates with many of one’s period of this new postacetabular procedure of your ilium. The new prior part of the articulation is actually quite convex which have a great limited dorsomedial extension. Continue Reading
