Thrinaxodon skull

This video is part of module L1 Mammalian Evolution & Comparative Anatomy by Dr. Robert J. Asher, Department of Zoology, University of Cambridge (www.robertjasher.com). Thrinaxodon is a non-mammalian cynodont, represented here by this specimen, UMZC T815. Notice the following anatomical features that contrast to Canis: 1) Its lower jaw consists of multiple bones. 2) Its jaw joint consists of articular-quadrate. 3) Its stapes is larger than that of modern mammals. 4) It has a small and anteriorly open braincase. 5) Its posterior teeth are multicuspid but not molariform. 6) Mineralized replacement teeth are evident in their crypts at nearly every other locus along entire toothrow Video on Canis jaw & braincase here: https://youtu.be/RDTPu_vIHTg Video on Canis ear region & jaw here: https://youtu.be/jM8nNQu_K5c Credits: specimen from the UMZC (University Museum of Zoology Cambridge) CT scan by Robert J. Asher taken at the Cambridge Biotomography Centre 3D render by Robert J. Asher with Drishti 2.6.4, Limaye 2012 (https://doi.org/10.1117/12.935640) and https://github.com/nci/drishti/ Video & audio editing with OBS Studio 27.0.1, https://obsproject.com/ OpenShot 2.6.1, https://www.openshot.org Some images shown with nomacs 3.16.1709, https://nomacs.org