Abstract
INTRODUCTION CT scanning was conducted in three different-sized snake vertebrae of Palaeopython helveticus sp. nov., including its holotype PIMUZ A/III 634, from Eocene fissure fills at Dielsdorf, near Zurich, Switzerland (e.g., Rosselet, 1991) in order to detect and evaluate ontogenetic variability in these fossils. In addition, a dentary of Palaeovaranus sp. was scanned to elucidate its internal histology and tooth implementation (Fig. 1 and Table METHODS The bones (snake vertebrae; dentary) from Dielsdorf were scanned with a Nikon XTH 225 ST CT Scanner housed at the Anthropological Department of the University of Zurich. The microcomputed tomography scan of the vertebrae was taken with a voltage of 91 kV and a current of 345 μA, yielding a voxel size of 0.03758 mm, with no filter used. The dentary was scanned with a voltage of 162 kV, a current of 102 μA, yielding a voxel size of 0.01654 mm, again with no filter used. Reconstruction of the digital stack for virtual 3D reconstruction was achieved using VG Studio Max 2.2. The 3D surface models are provided in .ply format and the datasets in DICOM format, and can therefore be opened with a wide range of freeware.
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