Data from: Schultz JA, Ruf I, Averianov AO, Schellhorn R, Lopatin AV, Martin T (2021) Jurassic mammaliaform petrosals from Western Siberia (Russia) and implications for early mammalian inner-ear anatomy. Zoological Journal of the Linnean Society Corresponding author: Schultz, Julia A., University of Bonn, https://orcid.org/0000-0003-3147-6346, jaschultz@uni-bonn.de Data and file overview: PIN5087_37-CT_Image_stack.zip (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) PIN5087_38-CT_Image_stack.zip (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) PIN5087_69-CT_Image_stack.zip (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) PIN5087_70-CT_Image_stack.zip (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) PIN5087_71-CT_Image_stack.zip (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) 3D_PDF_instructions_Schultz_etal_Siberian_Petrosals.pdf (PDF file with instructions to view the 3D-PDF files; open with any PDF viewer) PIN5087-37.pdf (3D-PDF of petrosal PIN 5087/37: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer) PIN5087-38.pdf (3D-PDF of petrosal PIN 5087/38: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer) PIN5087-69.pdf (3D-PDF of petrosal PIN 5087/69: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer) PIN5087-70.pdf (3D-PDF of petrosal PIN 5087/70: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer) PIN5087-71.pdf (3D-PDF of petrosal PIN 5087/71: polygonal model of petrosal, reconstructed endocast, blood vessels, and innervation pattern; open with any PDF viewer) PIN5087-37_clean_smoothed_reduced.stl (polygonal model of petrosal PIN 5087/37; open with e.g. 3D viewer of Microsoft Windows) PIN5087-38_clean_reduced.stl (polygonal model of petrosal PIN 5087/38; open with e.g. 3D viewer of Microsoft Windows) PIN5087-69_clean_smoothed_reduced.stl (polygonal model of petrosal PIN 5087/69; open with e.g. 3D viewer of Microsoft Windows) PIN5087-70_Berezovsk_cochlear_canal.stl (polygonal model of petrosal PIN 5087/70; open with e.g. 3D viewer of Microsoft Windows) PIN5087-71_Berezovsk_complete_petrosal_reduced.stl (polygonal model of petrosal PIN 5087/71; open with e.g. 3D viewer of Microsoft Windows)