Abstract
Based on a 3D reconstruction, a partial “symmetrodontan” skull from the Yixian Formation, Lujatun Member (Jehol Group) in northeastern China, is assigned to Maotherium sinense. The skull is preserved three-dimensionally including the right mandible, and parts of the maxilla, as well as two upper and eight lower teeth. The dental formula of the studied specimen is ?I, C, 2P, 4M/?i, c, 3p, 5m, and it lacks an m6 which is present in the holotype of M. sinense. No developing teeth inside the maxilla and mandible have been detected, and according to the almost unworn condition of the teeth, the specimen is a young adult. Our studied specimen and Zhangheotherium quinquecuspidens have the same postcanine tooth count of 2P/3p and 4M/5m. Among zhangheotheriids, the early diverged Kiyatherium and Anebodon have a higher number of premolars and a lower number of molars, whereas it is vice versa for the more derived Maotherium and Zhangheotherium.
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