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Acristavus gagslarsoni

Description

Acristavus is a genus of saurolophine dinosaur. Fossils have been found from the Campanian Two Medicine Formation in Montana and Wahweap Formation in Utah, United States. The type species A. gagslarsoni was named in 2011. Unlike nearly all hadrosaurids except Edmontosaurus, Acristavus lacked ornamentation on its skull. The discovery of Acristavus is paleontologically significant because it supports the position that the ancestor of all hadrosaurids did not possess cranial ornamentation, and that ornamentation was an adaptation that later arose interdependently in the subfamilies Saurolophinae and Lambeosaurinae. It is closely related to Brachylophosaurus and Maiasaura, and was assigned to a new clade called Brachylophosaurini.


Source Data
SourceIDLink
Global Biodiversity Information Facility ID (GBIF)8658689https://www.gbif.org/species/8658689
PaleoBioDB ID (PBDB)205435https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=205435
Rankspecies
Taxonomy (GBIF)Life : Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae : Acristavus : Acristavus gagslarsoni
Taxonomy (PBDB)Life : Animalia : Chordata : Ornithischia : Hadrosauridae : Acristavus : Acristavus gagslarsoni
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
informalAvemetatarsaliaBenton 1999
-OrnithodiraGauthier 1986
-DinosauromorphaBenton 1985
-DinosauriformesNovas 1992
-Dinosauria
-Ornithischia
-Neornithischia
-Ornithopoda
-Iguanodontia
-DryomorphaSereno 1986
-AnkylopollexiaSereno 1986
-StyracosternaSereno 1986
-HadrosauriformesSereno 1997
-Hadrosauroidea
familyHadrosauridaeCope 1869
subfamilyHadrosaurinaeLambe 1918
-BrachylophosauriniGates et al. 2011
genusAcristavusGates et al. 2011
speciesAcristavus gagslarsoniGates et al. 2011
Generic NameAcristavus
Scientific NameAcristavus gagslarsoni Gates et al., 2011
Opinions (PBDB)
NameRankOpinionEvidenceAuthor
Acristavus gagslarsonispeciesbelongs to Acristavusstated with evidenceGates et al., 2011
Acristavus gagslarsonispeciesbelongs to Acristavusstated without evidenceGates et al., 2014
Acristavus gagslarsonispeciesnomen dubium Acristavusstated without evidenceDalla Vecchia, 2014
Acristavus gagslarsonispeciesbelongs to Acristavusstated without evidenceLehman et al., 2016
Status (PBDB)extinct
Taxon Size (PBDB)1
First Recorded Appearance83.5 - 70.6 Ma
Late/Upper Cretaceous
Last Recorded Appearance83.5 - 70.6 Ma
Late/Upper Cretaceous
Environmentterrestrial (based on Ornithischia)
Motilityactively mobile (based on Ornithischia)
Dietherbivore (based on Ornithopoda)
Reproductionoviparous, dispersal=direct/internal,mobile (based on Ornithischia)
Ontogenyaccretion,modification of parts (based on Ornithischia)
Taphonomyhydroxylapatite,compact or dense (based on Ornithischia)
Primary Reference (PBDB)T. A. Gates, J. R. Horner, and R. R. Hanna, C. R. Nelson. 2011. New unadorned hadrosaurine hadrosaurid (Dinosauria, Ornithopoda) from the Campanian of North America. Journal of Vertebrate Paleontology 31(4):798-811
Wikipediahttps://en.wikipedia.org/wiki/Acristavus_gagslarsoni

Fossil Distribution

Synonymy List

YearName and Author
2011Acristavus gagslarsoni Gates et al. p. 799 figs. 2A, 3A-D, G, 4, 7-8, 10-11
2013Acristavus gagslarsoni Prieto-Marquez
2014Acristavus gagslarsoni Gates et al. p. 156
2016Acristavus gagslarsoni Lehman et al. p. 346
2016Acristavus gagslarsoni Prieto-Márquez et al. p. 6
2017Acristavus gagslarsoni Cruzado-Caballero and Powell p. 11
2019Acristavus gagslarsoni Takasaki et al. p. 5

References

Gates T. A., Horner J. R., et al (2011) New unadorned hadrosaurine hadrosaurid (Dinosauria, Ornithopoda) from the Campanian of North America, Journal of Vertebrate Paleontology 31 4, 798-811 doi:10.1080/02724634.2011.577854
Prieto-Marquez A. (2013) Skeletal morphology of Kritosaurus navajovius(Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini, Journal of Systematic Palaeontology doi:http://dx.doi.org/10.1080/14772019.2013.770417
Gates T. A., Jinnah Z., et al (2014) New hadrosaurid (Dinosauria, Ornithopoda) specimens from the lower-middle Campanian Wahweap Formation of southern Utah, Hadrosaurs, 156-173
Lehman T. M., Wick S. L., et al (2016) Hadrosaurian dinosaurs from the Maastrichtian Javelina Formation, Big Bend National Park, Texas, Journal of Paleontology 90 2, 333-356 doi:10.1017/jpa.2016.48
Prieto-Márquez A., Erickson G. M., et al (2016) A primitive hadrosaurid from southeastern North America and the origin and early evolution of ‘duck-billed’ dinosaurs, Journal of Vertebrate Paleontology 36 2, e1054495:1-10 doi:10.1080/02724634.2015.1054495
Cruzado-Caballero P., Powell J. E. (2017) Bonapartesaurus rionegrensis, a new hadrosaurine dinosaur from South America: implications for phylogenetic and biogeographic relations with North America, Journal of Vertebrate Paleontology 37 2, e1289381:1-16 doi:10.1080/02724634.2017.1289381
A. Prieto-Marquez (2013) Skeletal morphology of Kritosaurus navajovius(Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini: Journal of Systematic Palaeontology (http://dx.doi.org/10.1080/14772019.2013.770417) - via Catalogue of Life
T. A. Gates, J. R. Horner, R. R. Hanna, C. R. Nelson (2011) New unadorned hadrosaurine hadrosaurid (Dinosauria, Ornithopoda) from the Campanian of North America: Journal of Vertebrate Paleontology 4: 798--811 (10.1080/02724634.2011.577854) - via Catalogue of Life
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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