Lower molar series of various marsupial taxa belonging to Peradectidae (A) and Herpetotheriidae (B–F). A. Peradectes russelli, CB 1027 (CL), right m4 in lingual, occlusal, and labial views; B. Amphiperatherium lamandini, ECA 3104 (UM), fragment of right mandible with m3-4 in occlusal view; C. Peratherium elegans (type of Peratherium agmardi Filhol), QU 8216 (MNHN), right mandible with c and p1-m4 in occlusal view; D. Peratherium perrierense (holotype), PRR 2524, right mandible with i1-m4 in occlusal view; E. Peratherium cayluxi, QU 8217 (MNHN) (holotype), left mandible with p2-m1 and m3-4 in occlusal view; F. Amphiperatherium ambiguum, PLA 1042 (UM), left m4 in occlusal and lingual views. Figures after Crochet (1980). Scale bars: 1 mm.