six.2.3 Other Revueltosaurus-such as for example taxa
To start with regarded an enthusiastic ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, mais aussi al. ( 2007 ) argued you to NSM 004 Girlfriend , a beneficial rear part of a left maxilla that have a lot of good tooth during the a keen alveolus, shares numerous character claims which have Roentgen. callenderi both in dental and you can maxillary morphology also an effective ridge along the ventral margin of your antorbital fossa, new www.datingranking.net/tr/elite-singles-inceleme better-set up buccal emargination of enamel row into the ventral glance at, and you may a good denticled tooth crown not having a beneficial basal asymmetrical swelling (Irmis, Parker, et al., 2007 ). An enthusiastic ilium about Wolfville Formation (NSM 012 Sweetheart ) is extremely like R. callenderi when you look at the having an enthusiastic anterior procedure of the brand new iliac blade you to will not increase anteriorly beyond the prior the total amount of one’s pubic peduncle and contains a broad, round dorsal margin toward iliac blade. So it element along with helps the existence of good Revueltosaurus-such as taxon about creation (Sues & Olsen, 2015 ).
6.step three Biostratigraphic occurrences and you may implications
R. callenderi only has been submitted out-of several elements, the type area on Bull Canyon Development (Dockum Category) out of eastern The new Mexico (Look, 1989 ; Search ainsi que al., 2005 ) and the Chinle Creation in the Petrified Tree National Park (Padian, 1990 ; Beuhler et al., 2001 ; Parker mais aussi al., 2005 ; Atchley ainsi que al., 2013 ; Shape 1b). During the latter location, just before searching for discount specimens of one’s taxon in the best Blue Mesa Associate and center Sonsela Member, Roentgen. callenderi are said to occur in a restricted stratigraphic diversity when you look at the the reduced-center Petrified Forest Associate (Beuhler ainsi que al., 2001 ; Have a look, 2001 ; Parker & ) argued you to definitely Roentgen. callenderi is actually away from biochronological utility. Both in brand new North american country types of locality and Decorated Wasteland localities from inside the north PEFO, R. callenderi cooccurs into aetosaur T. coccinarum and you can mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa that have been used as index taxa towards the Revueltian holochronozone (Lucas & Look, 1993 ; ) debated one to since the within PEFO R. callenderi try found merely from inside the a certain facies (bluish paleosols) at just one stratigraphic level (just over the Coated Desert 3 Sandstone), these particular incidents didn’t portray the actual stratigraphic list of the brand new taxon and as an alternative reflected an upkeep bias. Then discoveries out-of R. callenderi question regarding the Owl Stone Member (Gordon ainsi que al., 2020 ; Whatley et al., 2013 ) and you can Sonsela Representative (Atchley mais aussi al., 2013 ) supporting that it theory, and these this new specimens show that no less than on PEFO, new stratigraphic list of Roentgen. callenderi offers into hidden Adamanian holochronozone. Its lack of Roentgen. callenderi from the other penecontemporaneous internet sites on the Western Southwest are puzzling, such as for instance offered just how plentiful it is at the websites in which it happen. Instance, the newest vertebrate assemblage of Petrified Tree Affiliate in the Ghost Ranch from inside the north New Mexico is geographically intermediate between your variety of area out of R. callenderi and you will PEFO, offers the fresh presence various Revueltian directory taxa (Irmis, Nesbitt, mais aussi al., 2007 ; Whiteside et al., 2015 ), possesses direct ages limits that demonstrate they overlaps in the long run with the lower Petrified Tree Affiliate from the PEFO (Irmis mais aussi al., 2011 ; Rasmussen ainsi que al., 2020 ). There’s no noticeable taphonomic reason that it really-sampled and you may diverse assemblage cannot manage Revueltosaurus, because consists of anything from brief-bodied drepanosaurs so you’re able to high-bodied phytosaurs and you can aetosaurs. Similarly, it is curious you to Roentgen. callenderi was not discovered at most other Bull Canyon Formation internet or perhaps in equivalent strata into the western Colorado (age.grams., Lehman & Chatterjee, 2005 ; ).