HOW BIG WAS 'BIG AL'? QUANTIFYING THE EFFECT OF SOFT TISSUE AND OSTEOLOGICAL UNKNOWNS ON MASS PREDICTIONS FOR ALLOSAURUS (DINOSAURIA:THEROPODA)

摘要: MOR693, nicknamed ‘Big Al,’ is the most complete skeleton of non-avian theropod Allosaurus and therefore provides best opportunity to investigate mass properties this important Jurassic through accurate physical or digital volumetric models. In study, laser scanning computer modelling software have been used construct models MOR693. A long-range scanner has digitize mounted cast allowing reconstruction body volumes respiratory structures around within three-dimensional (3D) skeletal model. The medium offered facility modify model nondestructively in a detailed sensitivity analysis quantify effects many unknown parameters involved such reconstructions. addition varying segments structures, we also extend include uncertainties regarding osteological articulations dinosaurs, including inter-vertebral spacing orientation ‘flare’ rib cage Results suggest inertial values are extremely uncertain show wide range plausible values, whilst CM (centre mass) position well constrained immediately front below hip joint consistent with similar reconstructions theropods.