5.six.cuatro Sacral backbone

Several isolated sacral centra was indeed gathered (age.g., PEFO 33875 and you will 33819), nevertheless the sacral rib and you will neural arc was busted away from. The amount of sacral spinal vertebrae is determined are a few created on: (a) a few type of sacral rib marks for the ilia off Roentgen. callenderi; (b) several ankylosed centra (PEFO 36876) that have clear articulations having ribs and neural arches (Figures 8i–k); and you can (c) truth be told there seem to be merely several morphologies of sacral vertebrae certainly the new isolated specimens. The 2 ankylosed centra indicates that certain specimens out of Roentgen. callenderi get coossify their sacral vertebrae hence so it character is actually variable within the taxon. Given that all specimens out of PFV 297 is actually out of comparable proportions, so it coossification in some specimens does not appear to be dimensions related. Instead, since the inside ventral view the lateral expansions of one’s centra up to the newest ankylosed town aren’t well symmetrical, so it combination you are going to show a beneficial cystic and extra specimens are required to confirm so it.

The brand new sacral centra is actually elongate and you may mediolaterally large than dorsoventrally tall, and centrum confronts is amphicoelous (Data 8i–k). Diesen Beitrag weiterlesen »