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A late-surviving basal theropod dinosaur from the latest Triassic of North America.
Proc Biol Sci. 2011 Nov 22; 278(1723):3459-64.PB

Abstract

The oldest theropod dinosaurs are known from the Carnian of Argentina and Brazil. However, the evolutionary diversification of this group after its initial radiation but prior to the Triassic-Jurassic boundary is still poorly understood because of a sparse fossil record near that boundary. Here, we report on a new basal theropod, Daemonosaurus chauliodus gen. et sp. nov., from the latest Triassic 'siltstone member' of the Chinle Formation of the Coelophysis Quarry at Ghost Ranch, New Mexico. Based on a comprehensive phylogenetic analysis, Daemonosaurus is more closely related to coeval neotheropods (e.g. Coelophysis bauri) than to Herrerasauridae and Eoraptor. The skeletal structure of Daemonosaurus and the recently discovered Tawa bridge a morphological gap between Eoraptor and Herrerasauridae on one hand and neotheropods on the other, providing additional support for the theropod affinities of both Eoraptor and Herrerasauridae and demonstrating that lineages from the initial radiation of Dinosauria persisted until the end of the Triassic. Various features of the skull of Daemonosaurus, including the procumbent dentary and premaxillary teeth and greatly enlarged premaxillary and anterior maxillary teeth, clearly set this taxon apart from coeval neotheropods and demonstrate unexpected disparity in cranial shape among theropod dinosaurs just prior to the end of the Triassic.

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Authors+Show Affiliations

Sues HD
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013-7012, USA. suesh@si.edu
Nesbitt SJ
No affiliation info available
Berman DS
No affiliation info available
Henrici AC
No affiliation info available

MeSH

AnimalsDinosaursFossilsNew MexicoPaleontologyPhylogenySkullSpecies SpecificityTooth

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21490016

Citation

Sues, Hans-Dieter, et al. "A Late-surviving Basal Theropod Dinosaur From the Latest Triassic of North America." Proceedings. Biological Sciences, vol. 278, no. 1723, 2011, pp. 3459-64.
Sues HD, Nesbitt SJ, Berman DS, et al. A late-surviving basal theropod dinosaur from the latest Triassic of North America. Proc Biol Sci. 2011;278(1723):3459-64.
Sues, H. D., Nesbitt, S. J., Berman, D. S., & Henrici, A. C. (2011). A late-surviving basal theropod dinosaur from the latest Triassic of North America. Proceedings. Biological Sciences, 278(1723), 3459-64. https://doi.org/10.1098/rspb.2011.0410
Sues HD, et al. A Late-surviving Basal Theropod Dinosaur From the Latest Triassic of North America. Proc Biol Sci. 2011 Nov 22;278(1723):3459-64. PubMed PMID: 21490016.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A late-surviving basal theropod dinosaur from the latest Triassic of North America. AU - Sues,Hans-Dieter, AU - Nesbitt,Sterling J, AU - Berman,David S, AU - Henrici,Amy C, Y1 - 2011/04/13/ PY - 2011/4/15/entrez PY - 2011/4/15/pubmed PY - 2012/2/9/medline SP - 3459 EP - 64 JF - Proceedings. Biological sciences JO - Proc Biol Sci VL - 278 IS - 1723 N2 - The oldest theropod dinosaurs are known from the Carnian of Argentina and Brazil. However, the evolutionary diversification of this group after its initial radiation but prior to the Triassic-Jurassic boundary is still poorly understood because of a sparse fossil record near that boundary. Here, we report on a new basal theropod, Daemonosaurus chauliodus gen. et sp. nov., from the latest Triassic 'siltstone member' of the Chinle Formation of the Coelophysis Quarry at Ghost Ranch, New Mexico. Based on a comprehensive phylogenetic analysis, Daemonosaurus is more closely related to coeval neotheropods (e.g. Coelophysis bauri) than to Herrerasauridae and Eoraptor. The skeletal structure of Daemonosaurus and the recently discovered Tawa bridge a morphological gap between Eoraptor and Herrerasauridae on one hand and neotheropods on the other, providing additional support for the theropod affinities of both Eoraptor and Herrerasauridae and demonstrating that lineages from the initial radiation of Dinosauria persisted until the end of the Triassic. Various features of the skull of Daemonosaurus, including the procumbent dentary and premaxillary teeth and greatly enlarged premaxillary and anterior maxillary teeth, clearly set this taxon apart from coeval neotheropods and demonstrate unexpected disparity in cranial shape among theropod dinosaurs just prior to the end of the Triassic. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/21490016/A_late_surviving_basal_theropod_dinosaur_from_the_latest_Triassic_of_North_America_ L2 - https://royalsocietypublishing.org/doi/10.1098/rspb.2011.0410?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -