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. 3 Tooth condition of Arboroharamiya sp. (IVPP V 18954, new specimen) A, D. optic images of the upper incisor germ (A) with the closer view (D) showing the dentition and the exposed mesial cusp; B, C. CL images showing the three cusped upper incisor germ (I2), two cusped upper incisor (dI2), and the fully formed ultimate molars. Red arrows point to tooth germs