2 GEOLOGICAL Setting
None Parker et al. ( 2005 ) nor Look ainsi que al. ( 2005 ) tried good phylogenetic data from Roentgen. callenderi in accordance with the brand new skeletal issue. Yet not, one another teams listed multiple popular features of new hindlimb that have been unambiguous synapomorphies of Pseudosuchia. Parker ainsi que al. ( 2005 ) hypothesized a prospective sister-classification relationship with aetosaurs, listing the latest morphological similarities of your own squamosal and you can paramedian osteoderms. An equivalent position is actually advised by the Take a look et al. ( 2005 ) based on unspecified profile claims of one’s tarsus and the osteoderms. Brusatte ainsi que al. ( 2010 ) included R. callenderi in their study from early archosaur relationships, programming about had written data and you can meanings out of Parker et al. ( 2005 ) and you can Seem et al. ( 2005 ). One data recovered R. callenderi as the sis taxon toward very early-diverging suchian clade Ornithosuchidae. ( 2011 ) retrieved R. callenderi during the a proper-served status just like the aunt taxon so you’re able to aetosaurs, an outcome supported by new knowledge (e.g., Butler mais aussi al., 2014 ; ; Nesbitt & Butler, 2013 ; Nesbitt ainsi que al., 2014 ; Nesbitt ainsi que al., 2020 ; Nesbitt, Stocker, ainsi que al., 2018 ).
So it sum totally refers to the osteology away from Roentgen. callenderi centered on no less than 12 someone (based on femora amount) off PEFO plus three better-maintained related partial skeletons gathered between 2005 and you may 2015, will bring osteohistological framework, and you can covers the taxon’s strengths getting knowledge early suchian development.
2.step 1 Stratigraphic updates
It breakdown off Roentgen. callenderi try mainly centered on situation regarding several localities in the Chinle Formation regarding Petrified Tree National Park (PEFO), Arizona, United states (Profile step 1; find Systematic Paleontology). The top of Triassic Chinle Development in this field comprises predominantly fluvial and you can floodplain strata from changing claystones, siltstones, sandstones, and conglomerates (Billingsley, 1985 ; Heckert & Lucas, 2002a ; ). The newest Chinle Development on Petrified Forest Federal Daha fazla bilgi Burada Park area conserves well-understood traditional assemblages out of vegetation (palynomorphs, leaves, wood), invertebrates, and you can vertebrates (age.g., Ash, 2005 ; Baranyi et al., 2018 ; A great, 1998 ; Irmis, 2005 ; Litwin, Navigate, & Ash, 1991 ; Parker, 2005b , 2006 ; Reichgelt mais aussi al., 2013 ). Most non-dentigerous and you can low-osteoderm specimens off Roentgen. callenderi out-of PEFO, also people described right here, have been found instantly a lot more than Coated Wilderness Sandstone step 3 (sensu Billingsley, 1985 ; Lithodendron Wash Bed sensu Heckert & Lucas, 2002a ) in-between part of the Petrified Tree Representative (sensu Woody, 2006 ) of the upper the main Chinle Development (Heckert & Lucas, 2002a ; Irmis, 2005 ; Padian, 1990 ; Parker, 2005b , 2006 ; Parker mais aussi al., 2005 ; Parker & ). Remote white teeth out of Roentgen. callenderi have been retrieved regarding microvertebrate assemblages out of low in brand new Chinle Creation at PEFO, stretching this new stratigraphic listing of which taxon for the Sonsela Affiliate and you can best Blue Mesa User (select Clinical Paleontology).
The 3 head localities one to lead new specimens off Roentgen. callenderi described here (Investigation S1) will be the Revueltosaurus Quarry (PFV 297), Revueltosaurus Quarry SW (PFV 414), and also the Giving Website (PFV 231). The web sites exist given that paleosols when you look at the a piled fluvial succession into the the midst of the fresh new Petrified Tree Member (Atchley ainsi que al., 2013 ; Loughney et al., 2011 ; Parker et al., 2005 ; Parker & ). PFV 297 and you can PFV 414 was split spatially of the 20 yards and are generally in turn throughout the 200 meters on the the southern part of out of PFV 231 (Figure 1a). Decorated Desert Sandstone step three, and that immediately underlies all three localities, is stratigraphically
40–50 meters above the root of the Petrified Forest Member (Profile 1b; Parker & ), and means a sheet sandstone transferred from the perennial circulate into the a good higher sinuosity lake route (Johns, 1988 ). PFV 297 and you can PFV 414 are present somewhat large on the succession than just PFV 231 (Parker & ).