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Non-dinosaurian Dinosauromorpha

Max C. Langer, Sterling J. Nesbitt, Jonathas S. Bittencourt and Randall B. Irmis
Geological Society, London, Special Publications, 379, 157-186, 13 February 2013, https://doi.org/10.1144/SP379.9
Max C. Langer
1Departamento de Biologia-FFCLRP, Universidade de São Paulo, 14040-901 Ribeirão Preto, Brazil
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  • For correspondence: mclanger@ffclrp.usp.br
Sterling J. Nesbitt
2Department of Biology, University of Washington, Seattle, WA 98195-1800, USA
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Jonathas S. Bittencourt
1Departamento de Biologia-FFCLRP, Universidade de São Paulo, 14040-901 Ribeirão Preto, Brazil
3Instituto de Geociências, Universidade Federal de Minas Gerais,31270-901 Belo Horizonte, Brazil
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Randall B. Irmis
4Natural History Museum of Utah and Department of Geology & Geophysics, University of Utah, 301 Wakara Way, Salt Lake City, UT 84108-1214, USA
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Abstract

Ichnological evidence suggests that dinosauromorphs originated by the Early Triassic, and skeletal remains of non-dinosaur representatives of the clade occur from the Anisian to the end of the Triassic. These taxa are small- to medium-sized, vary in feeding and locomotor features, and occurred over most of western Pangaea. They include the small lagerpetids from the Mid–Late Triassic of Argentina and the United States, and the larger, quadrupedal Silesauridae, with records in the Middle Triassic of Africa and Argentina, and in the Late Triassic of Europe, the Americas and northern Africa. The former group represents the earliest diverging dinosauromorphs, whereas silesaurids are more closely related to Dinosauria. Other dinosauromorphs include the archetypal early dinosauriform Marasuchus lilloensis (Middle Triassic of Argentina) and poorly known/controversial taxa such as Lewisuchus admixtus and Saltopus elginensis. The earliest diverging dinosauromorphs may have preyed on small animals (including insects), but cranio-dental remains are rare; by contrast, most silesaurids probably included plant material in their diet, as indicated by their modified jaw apparatus and teeth. Our knowledge of the anatomy and thus relationships of non-dinosaurian Dinosauromorpha is still deficient, and we suspect that future discoveries will continue to reveal novel patterns and hypotheses of palaeobiology and biogeography.

  • © The Geological Society of London 2013
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Geological Society, London, Special Publications: 379 (1)
Geological Society, London, Special Publications
Volume 379
2013
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Non-dinosaurian Dinosauromorpha

Max C. Langer, Sterling J. Nesbitt, Jonathas S. Bittencourt and Randall B. Irmis
Geological Society, London, Special Publications, 379, 157-186, 13 February 2013, https://doi.org/10.1144/SP379.9
Max C. Langer
1Departamento de Biologia-FFCLRP, Universidade de São Paulo, 14040-901 Ribeirão Preto, Brazil
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: mclanger@ffclrp.usp.br
Sterling J. Nesbitt
2Department of Biology, University of Washington, Seattle, WA 98195-1800, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jonathas S. Bittencourt
1Departamento de Biologia-FFCLRP, Universidade de São Paulo, 14040-901 Ribeirão Preto, Brazil
3Instituto de Geociências, Universidade Federal de Minas Gerais,31270-901 Belo Horizonte, Brazil
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Randall B. Irmis
4Natural History Museum of Utah and Department of Geology & Geophysics, University of Utah, 301 Wakara Way, Salt Lake City, UT 84108-1214, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Non-dinosaurian Dinosauromorpha

Max C. Langer, Sterling J. Nesbitt, Jonathas S. Bittencourt and Randall B. Irmis
Geological Society, London, Special Publications, 379, 157-186, 13 February 2013, https://doi.org/10.1144/SP379.9
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