侏罗纪燕辽生物群贼兽类牙齿发育双出齿和异时发育的证据

毛方园, 郑晓廷, 王孝理, 王元青, 毕顺东, 孟津

Evidence of diphyodonty and heterochrony for dental development in euharamiyidan mammals from Jurassic Yanliao Biota

MAO Fang-Yuan, ZHENG Xiao-Ting, WANG Xiao-Li, WANG Yuan-Qing, BI Shun-Dong, MENG Jin

Fig. 2 Tooth condition of Arboroharamiya allinhopsoni (HG-M 017, holotype) A. lateral view of the left partial skull, where the lower incisor germ is exposed at the breakage, posterodorsal to the root of the erupted incisor; B. CL image showing the left and right lower incisor germs in the jaws; C. optic image of the lateral view of partial right skull, showing the barely worn cheek teeth; D. CL image showing the two-cusped upper incisor germ in the maxilla, the unerupted two ultimate lower molars (m2), and the unerupted left ultimate upper molar (M2). Red arrows point to tooth germs