6.dos.step 3 Almost every other Revueltosaurus-including taxa
Originally labeled an ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, et al. ( 2007 ) contended you to NSM 004 Girl , a good posterior percentage of a left maxilla having much of a tooth when you look at the a keen alveolus, shares an abundance of character says with R. callenderi in dental and you may maxillary morphology along with a powerful ridge over the ventral margin of the antorbital fossa, the new really-arranged buccal emargination of your tooth row from inside the ventral check, and you can a beneficial denticled enamel crown devoid of an effective basal asymmetrical swelling (Irmis, Parker, et al., 2007 ). An ilium regarding Wolfville Development (NSM 012 Girl ) is very similar to that of Roentgen. callenderi during the which have an enthusiastic anterior procedure of this new iliac knife that does not expand anteriorly beyond the prior the quantity of your pubic peduncle and has an over-all, game dorsal margin for the iliac blade. That it function including supports the current presence of good Revueltosaurus-eg taxon regarding the creation (Sues & Olsen, 2015 ).
six.step three Biostratigraphic incidents and you will implications
R. callenderi only has started registered out of several parts, the kind locality regarding Bull Canyon Development (Dockum Category) out of eastern Brand new Mexico (See, 1989 ; Appear ainsi que al., 2005 ) plus the Chinle Creation within Petrified Tree National Park (Padian, 1990 ; Beuhler ainsi que al., 2001 ; Parker ainsi que al., 2005 ; Atchley et al., 2013 ; Shape 1b). In the latter area, before interested in discount specimens of your taxon throughout the best Bluish Mesa Affiliate and you can middle Sonsela User, R. callenderi is thought to take place in a restricted stratigraphic variety during the the lower-center Petrified Forest User (Beuhler mais aussi al., 2001 ; Appear, 2001 ; Parker & ) argued one to R. callenderi are from biochronological electric. In brand new Mexican variety of locality and you will Decorated Wasteland localities inside the northern PEFO, R. callenderi cooccurs to the aetosaur T. coccinarum and you can mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa which were put just like the list taxa into Revueltian holochronozone (Lucas & Appear, 1993 ; ) argued one given that in the PEFO Roentgen. callenderi is receive just for the a specific facies (blue paleosols) on just one stratigraphic top (right above the Decorated Desert step 3 Sandstone), these occurrences didn’t portray the genuine stratigraphic listing of new taxon and you can rather mirrored a preservation prejudice. Subsequent findings regarding Roentgen. callenderi procedure in the Owl Stone Affiliate (Gordon mais aussi al., 2020 ; Whatley ainsi que al., 2013 ) and you may Sonsela Associate (Atchley ainsi que al., 2013 ) helps that it hypothesis, that the latest specimens demonstrate that at the least within PEFO, the latest stratigraphic set of R. callenderi offers for the hidden Adamanian holochronozone. The absence of R. callenderi during the other penecontemporaneous internet sites from the Western Southwest is actually puzzling, such provided just how abundant it’s in the internet sites in which they does occur. For example, the newest vertebrate assemblage of one’s Petrified Tree Representative on Ghost Ranch for the north This new Mexico are geographically intermediate amongst the particular locality of R. callenderi and PEFO, shares new exposure numerous Revueltian index taxa (Irmis, Nesbitt, ainsi que al., 2007 ; Whiteside mais aussi al., 2015 ), and it has exact decades limits that demonstrate they overlaps as time passes towards all the way down Petrified Forest Affiliate from the PEFO (Irmis et al., 2011 ; Rasmussen ainsi que al., 2020 ). There’s no noticeable taphonomic good reason why which really-tested and you may varied assemblage cannot manage Revueltosaurus, because include many techniques from brief-bodied drepanosaurs so you can high-bodied phytosaurs and you may aetosaurs. Likewise, it’s curious one to Roentgen feeld ne. callenderi wasn’t bought at almost every other Bull Canyon Creation sites or in equivalent strata when you look at the western Texas (e.g., Lehman & Chatterjee, 2005 ; ).