Figure 1. Virtual 3D models of?docodontan petrosals (right side) from Berezovsk Quarry (Western Siberia, Russia). A, ventral view of PIN 5087/71; B, dorsal view of PIN 5087/71; C, ventral view of PIN 5087/38; D, dorsal view of PIN 5087/38. Anterior to the top. See also Supporting Information, available from digital data repository Dryad (https://doi.org/10.5061/ dryad.t1g1jwt2d). Abbreviations: basc, bony anterior semicircular canal; bpsc, bony posterior semicircular canal; ccc, canal containing crus commune; ci, crista interfenestralis; cips, canal connecting to the inferior petrosal sinus; cp, crista parotica; cv, canaliculus vestibuli (= bony canal for the membranous endolymphatic duct, foramen is broken); ef, endolymphatic foramen; fcn, foramen for the cochlear nerve; fsa, fossa subarcuata; fv, fenestra vestibuli; fvn, foramen for the vestibular nerve; hF, hiatus Fallopii; jn, jugular notch; lf, lateral flange;?lff, possibly lateral flange foramen; lt, lateral trough; mfp, medial flat facet of promontorium; mpr, mastoid pneumatic recess; nfa, nutritive foramina; p, promontorium; pf, perilymphatic foramen; pff, primary facial foramen; poc, prootic canal; ppr, paroccipital pneumatic recess; ptf, pterygoparoccipital foramen; sf, saccular foramen; sff, secondary facial foramen; sirsa, sulcus for inferior ramus of stapedial artery; slhv, sulcus for lateral

Published as part of Schultz, Julia A, Ruf, Irina, Averianov, Alexander O, Schellhorn, Rico, Lopatin, Alexey V & Martin, Thomas, 2022, Jurassic mammaliaform petrosals from Western Siberia (Russia) and implications for early mammalian inner-ear anatomy, pp. 1175-1200 in Zoological Journal of the Linnean Society 196 (3) on page 1179, DOI: 10.1093/zoolinnean/zlab096, http://zenodo.org/record/7318365