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. 1 Tooth replacement and identification of Arboroharamiya jenkinsi (holotype, STM 33-9) A, B. the left mandible in medial and optic view (A) and in CL view (B), showing that a tooth germ is dorsal to the root of the enlarged incisor in the dentary bone; C. upper incisor germ within a fragmentary maxilla, revealed by CL scan; D. lm2 in a CL image slice; E. rm2 in labial view; F. reconstruction of the rM2 from CL scan. Red arrows point to tooth germs