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Limb-Bone Scaling Indicates Diverse Stance and Gait in Quadrupedal Ornithischian Dinosaurs

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  • Susannah C R Maidment
  • Deborah H Linton
  • Paul Upchurch
  • Paul M Barrett

Abstract

Background: The most primitive ornithischian dinosaurs were small bipeds, but quadrupedality evolved three times independently in the clade. The transition to quadrupedality from bipedal ancestors is rare in the history of terrestrial vertebrate evolution, and extant analogues do not exist. Constraints imposed on quadrupedal ornithischians by their ancestral bipedal bauplan remain unexplored, and consequently, debate continues about their stance and gait. For example, it has been proposed that some ornithischians could run, while others consider that none were cursorial. Methodology/Principal Findings: Drawing on biomechanical concepts of limb bone scaling and locomotor theory developed for extant taxa, we use the largest dataset of ornithischian postcranial measurements so far compiled to examine stance and gait in quadrupedal ornithischians. Differences in femoral midshaft eccentricity in hadrosaurs and ceratopsids may indicate that hadrosaurs placed their feet on the midline during locomotion, while ceratopsids placed their feet more laterally, under the hips. More robust humeri in the largest ceratopsids relative to smaller taxa may be due to positive allometry in skull size with body mass in ceratopsids, while slender humeri in the largest stegosaurs may be the result of differences in dermal armor distribution within the clade. Hadrosaurs are found to display the most cursorial morphologies of the quadrupedal ornithischian cades, indicating higher locomotor performance than in ceratopsids and thyreophorans. Conclusions/Significance: Limb bone scaling indicates that a previously unrealised diversity of stances and gaits were employed by quadrupedal ornithischians despite apparent convergence in limb morphology. Grouping quadrupedal ornithischians together as a single functional group hides this disparity. Differences in limb proportions and scaling are likely due to the possession of display structures such as horns, frills and dermal armor that may have affected the center of mass of the animal, and differences in locomotor behaviour such as migration, predator escape or home range size.

Suggested Citation

  • Susannah C R Maidment & Deborah H Linton & Paul Upchurch & Paul M Barrett, 2012. "Limb-Bone Scaling Indicates Diverse Stance and Gait in Quadrupedal Ornithischian Dinosaurs," PLOS ONE, Public Library of Science, vol. 7(5), pages 1-23, May.
  • Handle: RePEc:plo:pone00:0036904
    DOI: 10.1371/journal.pone.0036904
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    References listed on IDEAS

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    1. Julia J. Day & David B. Norman & Paul Upchurch & H. Philip Powell, 2002. "Dinosaur locomotion from a new trackway," Nature, Nature, vol. 415(6871), pages 494-495, January.
    2. John R. Hutchinson & Mariano Garcia, 2002. "Tyrannosaurus was not a fast runner," Nature, Nature, vol. 416(6878), pages 349-349, March.
    3. John R. Hutchinson & Mariano Garcia, 2002. "Tyrannosaurus was not a fast runner," Nature, Nature, vol. 415(6875), pages 1018-1021, February.
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    Cited by:

    1. Evan Thomas Saitta, 2015. "Evidence for Sexual Dimorphism in the Plated Dinosaur Stegosaurus mjosi (Ornithischia, Stegosauria) from the Morrison Formation (Upper Jurassic) of Western USA," PLOS ONE, Public Library of Science, vol. 10(4), pages 1-20, April.
    2. Alice E. Maher & Gustavo Burin & Philip G. Cox & Thomas W. Maddox & Susannah C. R. Maidment & Natalie Cooper & Emma R. Schachner & Karl T. Bates, 2022. "Body size, shape and ecology in tetrapods," Nature Communications, Nature, vol. 13(1), pages 1-16, December.

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