Topology-Based Three-Dimensional Reconstruction of Delicate Skeletal Fossil Remains and the Quantification of Their Taphonomic Deformation

Oliver E. Demuth, Juan Benito, Emanuel Tschopp, Stephan Lautenschlager, Heinrich Mallison, Niklaus Heeb, Daniel J. Field

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
3 Downloads (Pure)

Abstract

Taphonomic and diagenetic processes inevitably distort the original skeletal morphology of fossil vertebrate remains. Key aspects of palaeobiological datasets may be directly impacted by such morphological deformation, such as taxonomic diagnoses and phylogenetic hypotheses, interpretations of the shape and orientation of anatomical structures, and assessments of interspecific and intraspecific variation. In order to overcome these ubiquitous challenges we present a novel reconstruction workflow combining retopology and retrodeformation, allowing the original morphology of both symmetrically and asymmetrically damaged areas of fossils to be reconstructed. As case studies, we present idealised three-dimensional reconstructions of the sternum of the crownward stem-bird Ichthyornis dispar, and cervical vertebrae of the diplodocid sauropod Galeamopus pabsti. Multiple Ichthyornis sterna were combined into a single, idealised composite representation through superimposition and alignment of retopologised models, and this composite was subsequently retrodeformed. The Galeamopus vertebrae were individually retrodeformed and symmetrised. Our workflow enabled us to quantify deformation of individual specimens with respect to our reconstructions, and to characterise global and local taphonomic deformation. Our workflow can be integrated with geometric morphometric approaches to enable quantitative morphological comparisons among multiple specimens, as well as quantitative interpolation of “mediotypes” of serially homologous elements such as missing vertebrae, haemal arches, or ribs.

Original languageEnglish
Article number828006
Pages (from-to)1-22
Number of pages22
JournalFrontiers in Ecology and Evolution
Volume10
DOIs
Publication statusPublished - 24 Mar 2022

Keywords

  • 3D modelling
  • dinosaurs
  • Galeamopus
  • Ichthyornis
  • reconstruction
  • retrodeformation
  • skeletal deformation
  • taphonomy

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