Carole Naglik
Supervisors: Christian Klug
Address: Paläontologisches Institut und Museum
Universität Zürich
Karl Schmid-Strasse 4
8006 Zürich
Switzerland
Address: Paläontologisches Institut und Museum
Universität Zürich
Karl Schmid-Strasse 4
8006 Zürich
Switzerland
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This is achieved by 3D-reconstructions (see figure 1) based on actual specimens, which were subjected to grinding tomography. For those specimens, CT-scans cannot be used because of the insufficient contrast between the calcitic replacement shell and the carbonatic sediment matrix. Therefore, three specimens of three major clades have been investigated using grinding tomography: the Middle Devonian agoniatitid Agoniatites clariondi, the Middle Devonian anarcestid Diallagites lenticulifer, and the Early Carboniferous goniatitid Goniatites multiliratus. The sections were then traced manually for each fourth slice, and lastly processed for the 3D-reconstruction using VGstudiomax® 2.1, which allows direct volume calculations. The chamber volumes are plotted versus shell diameter, which is used as a proxy for growth while the septum volumes are plotted versus aperture height through the ontogeny of the respective specimen.
The obtained volume data allow both intra-specimen comparisons through ontogeny and inter-clade comparisons, i.e. through phylogeny. Further specimens from both older and younger ammonoid clades are planned to be investigated to provide more information on volumetric changes through ontogeny and phylogeny. Additionally, these first volumetric data provide the possibility to empirically test the existing mathematical models for neutral buoyancy of ammonoids.
This is achieved by 3D-reconstructions (see figure 1) based on actual specimens, which were subjected to grinding tomography. For those specimens, CT-scans cannot be used because of the insufficient contrast between the calcitic replacement shell and the carbonatic sediment matrix. Therefore, three specimens of three major clades have been investigated using grinding tomography: the Middle Devonian agoniatitid Agoniatites clariondi, the Middle Devonian anarcestid Diallagites lenticulifer, and the Early Carboniferous goniatitid Goniatites multiliratus. The sections were then traced manually for each fourth slice, and lastly processed for the 3D-reconstruction using VGstudiomax® 2.1, which allows direct volume calculations. The chamber volumes are plotted versus shell diameter, which is used as a proxy for growth while the septum volumes are plotted versus aperture height through the ontogeny of the respective specimen.
The obtained volume data allow both intra-specimen comparisons through ontogeny and inter-clade comparisons, i.e. through phylogeny. Further specimens from both older and younger ammonoid clades are planned to be investigated to provide more information on volumetric changes through ontogeny and phylogeny. Additionally, these first volumetric data provide the possibility to empirically test the existing mathematical models for neutral buoyancy of ammonoids.