6.2.step three Other Revueltosaurus-for example taxa
To start with known a keen ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, mais aussi al. ( 2007 ) argued one to NSM 004 Girl , good rear portion of a remaining maxilla with most https://www.datingranking.net/tr/bdsm-inceleme/ of a beneficial enamel for the a keen alveolus, shares enough profile claims which have R. callenderi in both dental care and you may maxillary morphology plus a strong ridge along the ventral margin of your antorbital fossa, the brand new really-set-up buccal emargination of your enamel line within the ventral view, and you may a great denticled enamel crown devoid of a basal asymmetrical swelling (Irmis, Parker, mais aussi al., 2007 ). A keen ilium about Wolfville Creation (NSM 012 Girlfriend ) is very like Roentgen. callenderi for the which have an enthusiastic anterior procedure for the new iliac knife that cannot stretch anteriorly outside the prior extent of one’s pubic peduncle and has now a general, round dorsal margin into the iliac knife. So it function and helps the existence of a beneficial Revueltosaurus-including taxon on the development (Sues & Olsen, 2015 ).
six.step three Biostratigraphic incidents and you can ramifications
R. callenderi has only started filed regarding several parts, the kind locality on Bull Canyon Creation (Dockum Classification) of eastern The newest Mexico (Seem, 1989 ; Take a look ainsi que al., 2005 ) therefore the Chinle Formation at the Petrified Tree Federal Playground (Padian, 1990 ; Beuhler mais aussi al., 2001 ; Parker et al., 2005 ; Atchley ainsi que al., 2013 ; Shape 1b). In the latter place, before trying to find voucher specimens of your own taxon from the uppermost Bluish Mesa Associate and you may center Sonsela Representative, R. callenderi try considered take place in a small stratigraphic range into the the reduced-center Petrified Forest Representative (Beuhler ainsi que al., 2001 ; Seem, 2001 ; Parker & ) debated one Roentgen. callenderi was off biochronological electric. In both new Mexican type area and you will Painted Desert localities in the north PEFO, R. callenderi cooccurs toward aetosaur T. coccinarum and you can mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa which were made use of while the directory taxa towards the Revueltian holochronozone (Lucas & Check, 1993 ; ) debated you to definitely since the from the PEFO R. callenderi was discovered merely from inside the a specific facies (bluish paleosols) on just one stratigraphic top (right above the Decorated Wilderness 3 Sandstone), that these occurrences did not portray the real stratigraphic range of the newest taxon and as an alternative shown an upkeep bias. Then findings out-of R. callenderi point on Owl Material Representative (Gordon et al., 2020 ; Whatley mais aussi al., 2013 ) and Sonsela Affiliate (Atchley mais aussi al., 2013 ) supports it theory, and these the brand new specimens reveal that at least on PEFO, the fresh new stratigraphic variety of Roentgen. callenderi extends toward hidden Adamanian holochronozone. The absence of R. callenderi from the most other penecontemporaneous sites from the American Southwestern was puzzling, eg offered exactly how numerous it is in the internet sites in which it starts. Such as for instance, the newest vertebrate assemblage of one’s Petrified Forest Representative at Ghost Ranch inside the northern The brand new Mexico is geographically intermediate between the kind of area from R. callenderi and you may PEFO, shares new presence many Revueltian directory taxa (Irmis, Nesbitt, mais aussi al., 2007 ; Whiteside ainsi que al., 2015 ), and also precise ages restrictions that demonstrate they overlaps in time on the lower Petrified Forest Representative in the PEFO (Irmis mais aussi al., 2011 ; Rasmussen ainsi que al., 2020 ). There’s no visible taphonomic reason why this well-tested and you may diverse assemblage cannot maintain Revueltosaurus, since it include everything from brief-bodied drepanosaurs in order to high-bodied phytosaurs and you will aetosaurs. Similarly, it is curious that R. callenderi was not discovered at other Bull Canyon Development websites or in equivalent strata within the west Texas (age.grams., Lehman & Chatterjee, 2005 ; ).