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Arizonasaurus

Description

Arizonasaurus was a ctenosauriscid archosaur from the Middle Triassic (243 million years ago). Arizonasaurus is found in the Middle Triassic Moenkopi Formation of northern Arizona. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. The taxon has a large sailback formed by elongated neural spines of the vertebrae. The type species, Arizonasaurus babbitti, was named by Samuel Paul Welles in 1947.


Source Data
SourceIDLink
Global Biodiversity Information Facility ID (GBIF)4967783https://www.gbif.org/species/4967783
PaleoBioDB ID (PBDB)38226https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=38226
Rankgenus
Taxonomy (GBIF)Life : Animalia : Chordata : Reptilia : Thecodontia : Ctenosauriscidae : Arizonasaurus
Taxonomy (PBDB)Life : Animalia : Chordata : Reptilia : Eosuchia : Ctenosauriscidae : Arizonasaurus
Taxonomic Status (GBIF)accepted
Classification
(PBDB,GBIF)
RankNameAuthor
-Eukaryota
-OpisthokontaCavalier-Smith 1987
kingdomAnimalia
-TriploblasticaLankester 1877
-NephrozoaJondelius et al. 2002
-DeuterostomiaGrobben 1908
phylumChordataHaeckel 1847
subphylumVertebrataLamarck 1801
superclassGnathostomataGegenbauer 1874
-Osteichthyes
-SarcopterygiiRomer 1955
subclassDipnotetrapodomorpha
subclassTetrapodomorpha
-Tetrapoda
-ReptiliomorphaSäve-Söderbergh 1934
-AnthracosauriaSäve-Söderbergh 1934
-Batrachosauria
-Cotylosauria
-AmniotaHaeckel 1866
-SauropsidaHuxley 1864
classReptiliaLaurenti 1768
subclassEureptilia
-RomeriidaGauthier et al. 1988
-Diapsida
-Eosuchia
-NeodiapsidaBenton 1985
-SauriaGauthier 1984
-Archosauromorpha
-CrocopodaEzcurra 2016
-ArchosauriformesGauthier 1986
-EucrocopodaEzcurra 2016
-Archosauria
-Pseudosuchia
-SuchiaKrebs 1974
-ParacrocodylomorphaParrish 1993
-Poposauroidea
-Ctenosauriscidae
genusArizonasaurusWelles 1947
Scientific NameArizonasaurus Welles, 1947
Opinions (PBDB)
NameRankOpinionEvidenceAuthor
Arizonasaurusgenusbelongs to Pseudosuchiastated without evidenceWelles, 1947
Arizonasaurusgenusbelongs to Erythrosuchidaestated without evidenceCharig and Sues, 1976
Arizonasaurusgenusbelongs to ErythrosuchidaeimpliedCarroll, 1988
Arizonasaurusgenusbelongs to Erythrosuchidaestated with evidenceHunt, 1993
Arizonasaurusgenusbelongs to Poposauriastated with evidenceNesbitt, 2003
Arizonasaurusgenusbelongs to Suchiastated with evidenceNesbitt, 2005
Arizonasaurusgenusbelongs to Poposauroideastated with evidenceWeinbaum and Hungerbühler, 2007
Arizonasaurusgenusbelongs to Ctenosauriscidaestated with evidenceButler et al., 2011
Arizonasaurusgenusbelongs to Poposauroideastated with evidenceNesbitt, 2011
Status (PBDB)extinct
Taxon Size (PBDB)2
First Recorded Appearance247 - 242 Ma
Triassic
Last Recorded Appearance247 - 242 Ma
Triassic
Environmentterrestrial (based on Diapsida)
Motilityactively mobile (based on Osteichthyes)
Dietcarnivore (based on Pseudosuchia)
Taphonomyphosphatic (based on Vertebrata)
Primary Reference (PBDB)S. P. Welles. 1947. Vertebrates from the Upper Moenkopi Formation of northern Arizona. University of California Publications in Geological Sciences 27(7):241-294
Wikipediahttps://en.wikipedia.org/wiki/Arizonasaurus

Fossil Distribution

Subtaxa

NameStatusCommon Name(s)Fossil OccurrencesOldestYoungest
Arizonasaurus babbitti
species
accepted (GBIF)
listed (PBDB)
6247 Ma
Early/Lower Triassic
247 Ma
Early/Lower Triassic

Synonymy List

YearName and Author
1947Arizonasaurus Welles
1976Arizonasaurus Charig and Sues p. 37
1988Arizonasaurus Carroll
1993Arizonasaurus Hunt
2003Arizonasaurus Nesbitt p. S234
2005Arizonasaurus Nesbitt
2007Arizonasaurus Weinbaum and Hungerbühler p. 142
2011Arizonasaurus Butler et al.
2011Arizonasaurus Nesbitt fig. 51
2011Arizonasaurus Nesbitt et al. p. 272

References

Welles S. P. (1947) Vertebrates from the Upper Moenkopi Formation of northern Arizona, University of California Publications in Geological Sciences 27 7, 241-294
Charig A. J., Sues H.-D. (1976) Suborder Proterosuchia Broom 1906b, Handbuch der Paläoherpetologie 13, 11-39
Carroll R. L. (1988) , Vertebrate Paleontology and Evolution, 1-698
Nesbitt S. J. (2003) Arizonasaurus and its implications for archosaur divergence, Proceedings of the Royal Society of London B (supplement, Biology Letters) 270, S234-S237
Nesbitt S. J. (2005) Osteology of the Middle Triassic pseudosuchian archosaur Arizonasaurus babbitti, Historical Biology 17, 19-47
Weinbaum J. C., Hungerbühler A. (2007) A revision of Poposaurus gracilis (Archosauria: Suchia) based on two new specimens from the Late Triassic of the southwestern U.S.A., Palaeontologische Zeitschrift 81 2, 131-145
Butler R. J., Brusatte S. L., et al (2011) The sail-backed reptile Ctenosauriscus from the latest Early Triassic of Germany and the timing and biogeography of the early archosaur radiation, Plos One 6 10, e25693 doi:10.1371/journal.pone.0025693
Nesbitt S. J. (2011) The early evolution of archosaurs: relationships and the origin of major clades, Bulletin of the American Museum of Natural History 353, 1-292
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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