SCELIDOSAURUS HARRISONII OWEN, 1861 (DINOSAURIA: ORNITHISCHIA) FROM THE EARLY JURASSIC OF DORSET, ENGLAND: BIOLOGY AND PHYLOGENETIC RELATIONSHIPS
Zoological Journal of the Linnean Society
Oxford University Press
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Norman, D. SCELIDOSAURUS HARRISONII OWEN, 1861 (DINOSAURIA: ORNITHISCHIA) FROM THE EARLY JURASSIC OF DORSET, ENGLAND: BIOLOGY AND PHYLOGENETIC RELATIONSHIPS. Zoological Journal of the Linnean Society https://doi.org/10.1093/zoolinnean/zlaa061
A layer of keratinous scutes encased the skull of Scelidosaurus. The neurocranium as well as the associated principal sensory systems of this dinosaur are described. The cranial musculature is reconstructed and a subsequent functional analysis suggests that jaw motion was orthal, allowing pulping of vegetation and some high-angle shearing between opposing teeth. Wishboning of the lower jaw was enabled by transverse displacement of the quadrates; and the long-axis mandibular torsion that occurred during the chewing cycle was permitted by flexibility at the dentary symphysis. Limb proportions and pectoral and pelvic musculature reconstructions suggest that Scelidosaurus was a facultative quadruped of ‘average’ locomotor ability; it retains some anatomical features indicative of a bipedal-cursorial ancestry. Hindlimb motion was oblique-to-parasagittal to accommodate the girth of the abdomen. Scelidosaurus used a combination of costal and abdominally driven aspiration. The hypothesis that respiration was an ‘evolutionary driver’ of opisthopuby in all dinosaurs is overly simplistic. A critical assessment of datasets used to analyse the systematics of ornithischians (and thyreophoran subclades) has led to a revised dataset that positions Scelidosaurus as a stem ankylosaur, rather than a stem thyreophoran. The value of phylogenetic definitions is reconsidered in the light of the new thyreophoran cladogram.
PRISM FUND, TRINITY COLLEGE CAMBRIDGE, SMITHSONIAN INSTITUTION WASHINGTON DC, ST JOHN'S COLLEGE OXFORD.
Isaac Newton Trust (MINUTE 1106(M))
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External DOI: https://doi.org/10.1093/zoolinnean/zlaa061
This record's URL: https://www.repository.cam.ac.uk/handle/1810/305365
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