File:Early mammaliaform incisors and canines.png

English: Comparative morphology of incisors and canine among mammaliaforms. A, B. The morganucodontan Morganucodon oehleri Rigney, 1963, from the Lower Lufeng Formation, Lower Jurassic of China. A. CUP-FMNH 2320, type specimen. B. BMNH 2858, whole tooth and oblique-horizontal slice to visualize the single root canal. C. The mammaliaform Hadrocodium wui Luo, Crompton, and Sun, 2001 (holotype, IVPP 8275) from the Lower Lufeng Formation, Lower Jurassic of Yunnan, China; C1, upper incisors and canine; C2, lower incisors and canine. D. The docodontan Haldanodon exspectatus Kühne and Krusat, 1972 (Gui-Mam 41/75) from the Guimarota Coal Mine, Upper Jurassic of Portugal (Ruf et al. 2013; Huttenlocker et al. 2018). E. The docodontan Docofossor brachydactylus Luo, Meng, Ji, Liu, Zhang, and Neander, 2015b (BMNH 131735) from the Tiaojishan Formation, Upper Jurassic of China (Luo et al. 2015b). F. The docodontan Agilodocodon scansorius Meng, Ji, Zhang, Liu, Grossnickle, and Luo, 2015 (BMNH 00138) from the Tiaojishan Formation, Upper Jurassic of China (Meng et al. 2015b); F1, left upper incisors and canine in lingual view; F2, left lower incisors and canine (flipped). Hadrocodium wui is similar to Haldanodon exspectatus and Docofossor brachydactylus in the upper canine with fully divided roots, and to all docodonts in bilaterally compressed lower canine with partially divided (grooved) root(s) and the separated root canals inside the root(s). Hadrocodium wui is also similar to Kuehneotherium praecursoris in this feature (Gill 2004). Hadrocodium wui differs from Morganucodon oehleri and Sinoconodon rigneyi both of which are characterized by single-rooted and tubular upper and lower canines.