The newest tested femur (PEFO 33843) has a great diameter out-of fifteen

The newest tested femur (PEFO 33843) has a great diameter out-of fifteen

callenderi test, whoever mid-diaphysis biggest axis diameter selections from fourteen.4 (PEFO 34561) so you’re able to twenty two.step 1 mm (PEFO 33991). 1, which is following next brand new indicate (sixteen.cuatro mm) and you will just as the median size (15.4 mm) of your take to. Whether or not dimensions are perhaps not the ultimate proxy getting ontogeny (Griffin ainsi que al., 2020 ), the current presence of considerably large femora (PEFO 33991 and you will 35318) as well as the not enough a keen EFS inside PEFO 33843 both suggest the second individual wasn’t adult, although it got probably introduced the purpose of inflection with its development contour. Hence, we are able to hypothesize that of specimens inside data is neither very early juveniles or adults out of a beneficial skeletal maturity perspective.

5.nine.2 Paramedian osteoderms

Within the comparing new osteohistology of your own tested paramedian osteoderms of Roentgen. callenderi and Krzyzanowskisaurus hunti, it is essential to remember that certain noticed adaptation can be on account of positional effects, in both terms of the osteoderm’s right area from the carapace and you will in which along side osteoderm the fresh new histological area is actually pulled. Less than, i define the 2 osteoderms with her, clearly noting in which it disagree.

For instance the femur, brand new sampled paramedian osteoderm from R. callenderi (PEFO 33940a) has a thinner level from sparry calcite (Figures 13f, i), whereas brand new osteoderm away from K. hunti (UCMP 175058) keeps a coating out of emerald-colored adhesive, perhaps shellac (Rates 13h, j). Cracks and you can inner rooms off each other aspects is actually permineralized because of the calcite spar. Brief areas out-of UCMP 175058 was permineralized of the an opaque red-colored-brownish mineral (Data 13h, j), almost certainly a metal mineral including siderite otherwise hematite. One another specimens monitor a few high cracks having displacement and you can better level of faster hairline fractures (Data 13e–j) but they are if not better-maintained.

The data from reducing progress, but zero EFS, is actually generally similar to the dimensions range of femora from the PEFO R

Both osteoderms try predominantly lightweight cortical limbs with a fairly small amount of sparingly sized vascular rooms (Rates 13f–j); these types of room is smaller than those people seen in this new aetosauriform Good. geoffreyi ( : fig. 8), but much bigger than the heavily-packaged quick room that define inner cancellous muscle inside the aetosaurs (Cerda ainsi que al., 2018 ; Cerda & Desojo, 2011 ; Parker et al., 2008 ; Scheyer mais aussi al., 2014 ). Because the observed by Scheyer mais aussi al. ( 2014 : pg. 255) to possess a small paramedian osteoderm away from Roentgen. callenderi, such endosteal areas try rimmed because of the supplementary lamellar tissue; the supplementary cells completing these types of spaces is far more thorough about osteoderm out of K. hunti (Figures 13h, j). On the specimen of K. hunti, new ventral boundary for the renovated zone versions a marked discontinuity between your second tissues and you may no. 1 cells of one’s basal cortex (gray arrow in Profile 13j) which is similar to the resorption line Cerda mais aussi al. ( 2018 ) explained to have aetosaurs, but that it boundary try reduced collection of in Roentgen. callenderi (Profile 13i). However, the basal cortex in specimens is nearly totally avascular, save for many widely spaced simple canals and you may pri ) observed having Revueltosaurus plus the symptom in A beneficial. geoffreyi ( ), whereas aetosaurs be seemingly quite alot more vascular in this region (Cerda ainsi que al., 2018 ; Scheyer ainsi que al., 2014 ). So it primary bones of the basal cortex comprises synchronous-fibered muscle, but lacks the fresh laminar structure discussed to possess An excellent. geoffreyi (cf. , p. 16). The newest basal cortex of your Roentgen. callenderi osteoderm and it has seemingly abundant Sharpey’s fibers during the a premier position on the long axis of the get across-point (Figure 13i, just as the status found in certain aetosaurs (cf. Cerda ainsi que al., 2018 : fig. 7g–h), while they appear to get absent inside K. hunti (Contour 13j).

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