callenderi take to, whoever mid-diaphysis big axis diameter ranges regarding 14.4 (PEFO 34561) so you can 22.1 mm (PEFO 33991). step one, that is following next the mean (sixteen.cuatro mm) and you can just as the median size (fifteen.cuatro mm) of your decide to try. Even if size is maybe not the greatest proxy to own ontogeny (Griffin ainsi que al., 2020 ), the current presence of dramatically larger femora (PEFO 33991 and 35318) additionally the lack of a keen EFS in PEFO 33843 both mean that second private was not mature, although it got likely enacted the purpose of inflection within its increases bend. For this reason, we can hypothesize that of one’s specimens within studies is actually neither very early juveniles or people off a great skeletal maturity angle.
5.9.2 Paramedian osteoderms
From inside the researching new osteohistology of tested paramedian osteoderms regarding R. callenderi and you will Krzyzanowskisaurus hunti, it is essential to note that particular noticed variation tends to be on account of positional outcomes, in terms of this new osteoderm’s precise area throughout the carapace and in which along side osteoderm the newest histological part was pulled. Lower than, we explain the two osteoderms with her, clearly listing where they disagree.
Like the femur, the newest tested paramedian osteoderm out-of Roentgen. callenderi (PEFO 33940a) keeps a thinner covering from sparry calcite (Data 13f, i), while the newest osteoderm out-of K. hunti (UCMP 175058) have a covering out of amber-colored glue, maybe shellac (Rates 13h, j). Cracks and you will internal areas of both issue is actually permineralized of the calcite spar. Short areas away from UCMP 175058 was permineralized because of the a keen opaque yellow-brown mineral (Figures 13h, j), more than likely an iron mineral including siderite or hematite. Both specimens display a few higher cracks having displacement and you will deeper level of faster hairline cracks (Figures 13e–j) but they are or even well-kept.
The evidence off slowing progress, however, zero EFS, is broadly similar to the size listing of femora in the PEFO R
Each other osteoderms is mainly lightweight cortical limbs with a fairly quick number of meagerly size of vascular spaces (Data 13f–j); this type of rooms is actually smaller than those present in the fresh aetosauriform An effective. geoffreyi ( : fig. 8), but bigger than the heavily-packed short spaces that define inner cancellous structure into the aetosaurs (Cerda et al., 2018 ; Cerda & Desojo, 2011 ; Parker mais aussi al., 2008 ; Scheyer et al., 2014 ). Given that seen of the Scheyer ainsi que al. ( 2014 : pg. 255) getting a tiny paramedian osteoderm of Roentgen. callenderi, these endosteal room are rimmed because of the additional lamellar structure; the additional tissue answering this type of areas is much more detailed regarding the osteoderm out of K. hunti (Rates 13h, j). Regarding specimen away from K. hunti, the newest ventral edge of this refurbished zone forms a marked discontinuity amongst the secondary cells ekЕџi beautifulpeople and you will first cells of one’s basal cortex (grey arrow when you look at the Shape 13j) that’s just like the resorption range Cerda mais aussi al. ( 2018 ) discussed having aetosaurs, but it line was reduced line of when you look at the R. callenderi (Profile 13i). Conversely, the new basal cortex in both specimens is close to completely avascular, conserve for some widely separated easy canals and you may pri ) noticed to own Revueltosaurus as well as the condition in A great. geoffreyi ( ), while aetosaurs be seemingly slightly a lot more vascular in this region (Cerda et al., 2018 ; Scheyer ainsi que al., 2014 ). Which first bones of your basal cortex comprises parallel-fibered tissues, however, lacks the brand new laminar consistency described to have An excellent. geoffreyi (cf. , p. 16). Brand new basal cortex of Roentgen. callenderi osteoderm and has seemingly abundant Sharpey’s material on a premier perspective toward long axis of your get across-section (Contour 13i, just like the reputation seen in particular aetosaurs (cf. Cerda et al., 2018 : fig. 7g–h), while they look to-be absent during the K. hunti (Profile 13j).