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    Foth, Christian Hedrick, Brandon P. and Ezcurra, Martin D. 2016. Cranial ontogenetic variation in early saurischians and the role of heterochrony in the diversification of predatory dinosaurs. PeerJ, Vol. 4, p. e1589.

    2012. Dinosaur Paleobiology.

    Cabreira, Sergio F. Schultz, Cesar L. Bittencourt, Jonathas S. Soares, Marina B. Fortier, Daniel C. Silva, Lúcio R. and Langer, Max C. 2011. New stem-sauropodomorph (Dinosauria, Saurischia) from the Triassic of Brazil. Naturwissenschaften, Vol. 98, Issue. 12, p. 1035.

    Mancuso, Adriana C. Gaetano, Leandro C. Leardi, Juan M. Abdala, Fernando and Arcucci, Andrea B. 2014. The Chañares Formation: a window to a Middle Triassic tetrapod community. Lethaia, Vol. 47, Issue. 2, p. 244.

    Pott, Christian and McLoughlin, Stephen 2014. Divaricate growth habit in Williamsoniaceae (Bennettitales): unravelling the ecology of a key Mesozoic plant group. Palaeobiodiversity and Palaeoenvironments, Vol. 94, Issue. 2, p. 307.

    Sereno, Paul C. Martínez, Ricardo N. and Alcober, Oscar A. 2012. Osteology ofEoraptor lunensis(Dinosauria, Sauropodomorpha). Journal of Vertebrate Paleontology, Vol. 32, Issue. sup1, p. 83.


The roles of herbivory and omnivory in early dinosaur evolution

  • Paul M. Barrett (a1), Richard J. Butler (a2) and Sterling J. Nesbitt (a3) (a4)
  • DOI:
  • Published online: 17 May 2011

Herbivorous and omnivorous dinosaurs were rare during the Carnian stage of the Late Triassic. By contrast, the succeeding Norian stage witnessed the rapid diversification of sauropodomorphs and the rise of the clade to ecological dominance. Ornithischians, by contrast, remained relatively rare components of dinosaur assemblages until much later in the Mesozoic. The causes underlying the differential success of ornithischians and sauropodomorphs remain unclear, but might be related to trophic specialisation. Sauropodomorphs replaced an established herbivore guild consisting of rhynchosaurs, aetosaurs and basal synapsids, but this faunal turnover appears to have been opportunistic and cannot be easily attributed to either competitive interactions or responses to floral change. Consideration of diversity patterns and relative abundance suggests that the ability to eat plants might have been a major factor promoting sauropodomorph success, but that it was less important in the early evolution of Ornithischia. On the basis of current evidence it is difficult to determine the diet of the ancestral dinosaur and scenarios in which omnivory or carnivory represent the basal condition appear equally likely.

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Earth and Environmental Science Transactions of The Royal Society of Edinburgh
  • ISSN: 1755-6910
  • EISSN: 1755-6929
  • URL: /core/journals/earth-and-environmental-science-transactions-of-royal-society-of-edinburgh
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