AMYNODONTIDAE

“ Pappaceras ” meiomenus Wang H.-B., Bai, Meng &Wang Y.-Q., 2016 shares with Amynodontidae seven unambiguous synapomorphies: compared length of the premolar/molar rows <42 63 (2); P 1 in adults is usually present 91 (1); P2 protocone and hypocone are fused 94 (0); P3-4 protocone and hypocone are fused 102 (0); upper molars antecrochet is usually absent 110 (1); upper molars lingual cingulum is usually present 114 (1); M1-2 paracone fold is strong 118 (0).

The monophyly of the Amynodontidae is well supported, with a Bremer index of 4. The monophyly of Amynodontidae (here the smallest clade including Rostriamynodon grangeri Wall & Manning, 1986 and Cadurcodon kazakademius Biryukov,1961) is defined by five unambiguous synapomorphies:lacrimal process is absent 8 (1); anterior base of the zygomatic process of the maxilla is high 10 (0); P 1 in adults is always absent 91 (2); upper canine is strong 283 (2); upper molars parastyle is reduced 296 (1).