DOI: 10.5061/dryad.t1g1jwt2d
title: Original CT image stacks of five fossil petrosal bones from Siberia, 3D PDF files of reconstructed endocasts, blood vessels and innervation patterns, 3D PDF instruction file, STL files of the petrosals

description: Five partially preserved mammaliaform petrosals recovered from Middle
 Jurassic sediments of the Berezovsk coal mine (Krasnoyarsk Krai, Russia)
 show similarities to other early mammaliaforms like the morganucodontan
 Morganucodon and the docodontan Haldanodon in having an inflated
 promontorium, and a curved and apically inflated cochlear canal. But they
 are distinct from dryolestoid and derived mammalian petrosals by the weak
 coiling of the cochlear duct and the presence of a perilymphatic foramen
 with an open perilymphatic sulcus. The two larger and robust specimens
 exhibit striking similarities to docodontan petrosals. Inside the bone an
 intricate circumpromontorial venous plexus was discovered as recently
 described for the docodontan Borealestes, confirming this structure is
 consistently present in basal mammaliaforms. The three smaller and slender
 petrosals likely belong to haramiyidans and are unique in showing a
 septum-like structure medially along the cochlear nerve entrance. The
 protruding perforated bony bar that is preserved in two of the three is
 interpreted here to be a remnant of a bony septum with multiple foramina
 for cochlear nerve fibers, representing an autapomorphic feature of
 Haramiyida. This newly described passageway for nerve fibers shows that
 the formation of the osteological structure surrounding the nervous
 pathways of the cochlea is more plastic among the most basal mammaliaforms
 than previously thought.
description: Petrosals were picked from the &gt;2.0 mm fraction of the
 screen washed clay and scanned with the 180 kV X-ray tube of the v|tome|x
 s µCT device (GE Sensing & Inspection Technologies GmbH
 phoenix|x-ray) of the Institute of Geosciences, Section Paleontology,
 Rheinische Friedrich-Wilhelms-Universität Bonn, Germany. Image size was
 1024 × 1024 pixels. Reconstruction software datos|x rec (GE Sensing
 & Inspection Technologies GmbH phoenix|x-ray) and VG Studio Max
 2.0 (Volume Graphics) was used to produce CT images stacks. Avizo® 6.3
 (VSG Visualization Sciences Group, FEI Company) was used for reconstuction
 of endocasts and surface models. The 3D PDF files were created using DAZ
 studio v4.15 and Adobe Acrobat X pro.
description: Data and file overview:<br> <br>
 <strong>PIN5087_37-CT_Image_stack.zip</strong><br>
 ZIP-folder of CT image stack raw data (.jpg) and scan settings (.vgi);
 unpack ZIP-folder to use, open .vgi with Editor of Microsoft
 Windows<br> <br>
 <strong>PIN5087_38-CT_Image_stack.zip</strong><br>
 ZIP-folder of CT image stack raw data (.jpg) and scan settings (.vgi);
 unpack ZIP-folder to use, open .vgi with Editor of Microsoft
 Windows<br> <br>
 <strong>PIN5087_69-CT_Image_stack.zip</strong><br>
 ZIP-folder of CT image stack raw data (.jpg) and scan settings (.vgi);
 unpack ZIP-folder to use, open .vgi with Editor of Microsoft
 Windows<br> <br>
 <strong>PIN5087_70-CT_Image_stack.zip</strong><br>
 ZIP-folder of CT image stack raw data (.jpg) and scan settings (.vgi);
 unpack ZIP-folder to use, open .vgi with Editor of Microsoft
 Windows<br> <br>
 <strong>PIN5087_71-CT_Image_stack.zip</strong><br>
 ZIP-folder of CT image stack raw data (.jpg) and scan settings (.vgi);
 unpack ZIP-folder to use, open .vgi with Editor of Microsoft
 Windows<br> <br>
 <strong>3D_PDF_instructions_Schultz_etal_Siberian_Petrosals.pdf</strong><br> PDF file with instructions to view the 3D-PDF files; open with any PDF viewer<br> <br> <strong>PIN5087-37.pdf</strong><br> 3D-PDF of petrosal PIN 5087/37: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer<br> <br> <strong>PIN5087-38.pdf</strong><br> 3D-PDF of petrosal PIN 5087/38: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer<br> <br> <strong>PIN5087-69.pdf</strong><br> 3D-PDF of petrosal PIN 5087/69: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer<br> <br> <strong>PIN5087-70.pdf</strong><br> 3D-PDF of petrosal PIN 5087/70: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer<br> <br> <strong>PIN5087-71.pdf</strong><br> 3D-PDF of petrosal PIN 5087/71: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer<br> <br> <strong>PIN5087-37_clean_smoothed_reduced.stl</strong><br> polygonal model of petrosal PIN 5087/37; open with e.g. 3D viewer of Microsoft Windows<br> <br> <strong>PIN5087-38_clean_reduced.stl</strong><br> polygonal model of petrosal PIN 5087/38; open with e.g. 3D viewer of Microsoft Windows<br> <br> <strong>PIN5087-69_clean_smoothed_reduced.stl</strong><br> polygonal model of petrosal PIN 5087/69; open with e.g. 3D viewer of Microsoft Windows<br> <br> <strong>PIN5087-70_Berezovsk_cochlear_canal.stl</strong><br> polygonal model of petrosal PIN 5087/70; open with e.g. 3D viewer of Microsoft Windows<br> <br> <strong>PIN5087-71_Berezovsk_complete_petrosal_reduced.stl</strong><br> polygonal model of petrosal PIN 5087/71; open with e.g. 3D viewer of Microsoft Windows<br> <br> <strong>README.txt</strong><br> information to use the dataset; open with Editor of Microsoft Windows