METAMYNODONTINI, Kretzoi, 1942

Veine-Tonizzo, Léa, Tissier, Jérémy, Bukhsianidze, Maia, Vasilyan, Davit & Becker, Damien, 2023, Cranial morphology and phylogenetic relationships of Amynodontidae Scott & Osborn, 1883 (Perissodactyla, Rhinocerotoidea), Comptes Rendus Palevol 22 (8), pp. 109-142 : 122

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).