Cranial morphology and phylogenetic relationships of Amynodontidae Scott & Osborn, 1883 (Perissodactyla, Rhinocerotoidea) Author Veine-Tonizzo, Léa Géosciences Rennes, UMR 6118, Université de Rennes 1, CNRS, 35000 Rennes (France) and JURASSICA Museum, Route de Fontenais 21, CH- 2900 Porrentruy (Switzerland) and Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K 1 S 5 B 6 (Canada) and Beaty Centre for Species Discovery, Canadian Museum of Nature, PO Box 3443, Station D., Ottawa, ON, K 1 P 6 P 4 (Canada) leaveinetonizzo @ cmail. carleton. ca (corresponding author) leaveinetonizzo@cmail.carleton.ca Author Tissier, Jérémy JURASSICA Museum, Route de Fontenais 21, CH- 2900 Porrentruy (Switzerland) and American Museum of Natural History, Central Park West at 79 Street, US- 10024 New York (United States) jeremy. tissier 123 @ gmail. com jeremy.tissier123@gmail.com Author Bukhsianidze, Maia Georgian National Museum, 3, Purtseladze street, Tbilisi 0105 (Georgia) maiabukh @ gmail. com maiabukh@gmail.com Author Vasilyan, Davit Author Becker, Damien JURASSICA Museum, Route de Fontenais 21, CH- 2900 Porrentruy (Switzerland) and Department of Geosciences, University of Fribourg, CH- 1700 Fribourg (Switzerland) davit. vasilyan @ jurassica. ch damien. becker @ jurassica. ch davit.vasilyan@jurassica.ch text Comptes Rendus Palevol 2023 2023-03-20 22 8 109 142 http://dx.doi.org/10.5852/cr-palevol2023v22a8 journal article 305635 10.5852/cr-palevol2023v22a8 f100859e-029b-47d5-8854-258ca1d5d772 1777-571X 14238834 urn:lsid:zoobank.org:pub:3201699E-0180-4DB2-9C25-60EE6A783D85 METAMYNODONTINI The tribe Metamynodontini is defined by three unambiguous synapomorphies free of homoplasy (Bremer index = 1): the zygomatic arch is high 11 (1); the postglenoid process of squamosal is flat 42 (0); the humerus distal articulation has a deep median constriction (diabolo-shaped) 194 (1). This tribe includes the two clades ( Paramynodon , Megalamynodon ) and ( Sellamynodon , Metamynodon ). The clade formed by Paramynodon and Megalamynodon is supported by two unambiguous synapomorphies (Bremer index = 1): the zygomatic process progressively diverges from the maxilla 37 (0); I3 has a similar size to I2 293 (1). The clade formed by Sellamynodon and Metamynodon is supported by a single unambiguous synapomorphy (Bremer index = 1): the external auditory pseudomeatus is closed 18 (2). The specimen UNISTRA.2015.0.1106 is sister group to Metamynodon planifrons , which supports its taxonomical identification (Bremer index = 1). Metamynodon planifrons ( sensu lato , = UNISTRA.2015.0.1106 and M. planifrons ) has three autapomorphies: the anterior base of the zygomatic process of the maxilla is low 10 (1); the vomer is acute 38 (0); the paracone fold of M3 is absent 289 (1).