6.dos R. callenderi, Revueltosaurus-particularly taxa, while the isolated enamel situation
According to all of our research, Roentgen
The original around three character claims reinforce brand new articulations between your facial issues regarding the mouth musculature (Schumacher, 1973 ). The spot of your abducens courage foramen is to start with hypothesized due to the fact a prospective synapomorphy supporting an excellent crocodylomorph + aetosaur clade personal away from almost every other pseudosuchians (Gower, 2002 ), but newer phylogenetic analyses, plus ours, highly recommend so it apomorphy evolved at least twice-just after inside the aetosauriforms and once in crocodylomorphs. But not quantified within data, good dorsoventrally thickened skull roof (i.age., nasals, frontals, and you may parietals) is also shared by the Roentgen. callenderi, erpetosuchids, and you will aetosaurs.
callenderi and you can aetosaurs share similarities regarding the size of new hindlimb so you can forelimb and form of the new humerus and you may proximal foot issue, though those people parallels weren’t unambiguous synapomorphies. Specifically, Roentgen. callenderi and you will aetosaurs express a reduced distance in line with new humerus, and an excellent concave rear epidermis of the calcaneal tuber, even in the event such apomorphies has a extensive delivery certainly Archosauria. Roentgen. callenderi and aetosaurs share center trunk vertebrae having diapophyses and you can parapophyses one to expand sideways in which each other articulations originate for the good transverse process. High aetosaurs (elizabeth.grams., D. spurensis, MNA V9300; T. coccinarum, NMMNH P-12964; Parker, 2008 ; Heckert et al., 2010 ) grow these processes laterally and you will partly or entirely coossify them to this new respective rib to form an over-all dorsal facial skin. (more…)