Fig. 6. Comparative 3D renderings of upper dentition of the morganucodontans Morganucodon watsoni Kühne, 1949 (A, UMZC Eo.CR.1, reversed; Lower Jurassic fissure fills, Wales, UK), Storchodon cingulatus Martin, Averianov, Jäger, Schwermann, and Wings, 2019 (B, NLMH 105654; Upper Jurassic Süntel Formation, Germany), Megazostrodon rudnerae Crompton and Jenkins, 1968 (C, NHMUK PV M 26407; Lower Jurassic Stormberg Group, Lesotho), and Cifellilestes ciscoensis gen. et sp. nov. (D, OMNH 80538, holotype; Upper Jurassic Morrison Formation, USA), in lingual (A1–D1) and occlusal (A2–D2) views. White lines indicate the premolar–molar boundary (all taxa except Storchodon, which is known by only a single molar). This boundary is marked by a tall-crowned ultimate premolar with much lower flanking cusps followed by a first molar that is comparatively lower crowned with less height difference between the main cusps. Note imbrication of the molars in C. ciscoensis gen. et sp. nov. (D2) and distal molars in Mo. watsoni (A2), a feature absent in Me. rudnerae (C2).