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 “ HYRACODONTIDAE ” Teletaceras radinskyi Hanson, 1989 is placed as an early-diverging rhinocerotoid and as a sister taxon to the clade including the Eggysodontidae , the Paraceratheriidae and the Amynodontidae . The monophyly of Eggysodontidae is supported by five unambiguous synapomorphies: protocone and hypocone on P2 form a lingual bridge 94 (1); the hypocone is anterior to metacone on P3-4 103 (2); M3 ectoloph and metaloph are fused (ectometaloph) 133 (1); navicular cross section is rectangle 268 (1); lower canines are strong 284 (2). The clade has a Bremer index = 2. Eggysodontidae are sister group of the clade formed by Hyracodon nebraskensis Leidy, 1850 , Paraceratheriidae and Amynodontidae . Hyracodon nebraskensis is a sister taxon to Paraceratheriidae and Amynodontidae . Three unambiguous synapomorphies support the monophyly of Paraceratheriidae : nearly horizontal symphysis 53 (2); M3 ectoloph and metaloph are fused (ectometaloph) 133 (1); atlas axis-facets are transversally concave 187 (2) and it is weakly supported (Bremer index = 1) .