Two applications of 3D semi-landmark morphometrics implying different template designs: the theropod pelvis and the shrew skull |
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| Authors: | Thibaud Souter Raphael Cornette Julio Pedraza John Hutchinson Michel Baylac |
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| Institution: | 1. UMR 7207–CR2P, laboratoire de paléontologie, département histoire de la Terre, centre de recherche sur la paléobiodiversité et les paléoenvironnements, CNRS, Muséum national d’histoire naturelle, 8, rue Buffon, 75005 Paris, France;2. UMR 7205, département systématique et évolution, origine, structure et évolution de la biodiversité (OSEB), CNRS, Muséum national d’histoire naturelle, plateforme morphométrie, bâtiment d’entomologie, 45, rue Buffon, 75005 Paris, France;3. UMR 7179–mécanismes adaptatifs : des organismes aux communautés, département écologie et gestion de la biodiversité, CNRS, Muséum national d’histoire naturelle, pavillon d’anatomie comparée, 55, rue Buffon, 75005 Paris, France;4. UMS 2700–outils et méthodes de la systématique intégrative, plateforme morphométrie, département systématique et évolution, CNRS, Muséum national d’histoire naturelle, bâtiment d’entomologie, 45, rue Buffon, 75005 Paris, France;5. Structure & Motion Laboratory, Department of Veterinary Basic Sciences, The Royal Veterinary College, University of London, Hawkshead Lane, London, Herts AL9 7TA, United Kingdom |
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| Abstract: | Geometric morphometrics involves defining landmark points to generate a discrete representation of an object. This crucial step is strongly influenced by the biological question guiding the analysis, and even more when using curve and surface semi-landmarks methods, because these require to generate a template of reference. We exemplify these constraints using two datasets from projects with very different backgrounds. The Theropod Dataset is a functional morphometric analysis of different extinct and extant theropod pelves. The Shrew Dataset is a populational morphometric analysis of the white-toothed shrew with very small variations in skull shape. We propose a novel procedure to generate a regular template configuration, using polygonal modelling tools. This method allows us to control the template geometry and adapt its complexity to the morphological variation in the sample. More studies are necessary to assess the morphometric and statistical importance of template design in curve and surface analyses. |
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