Development of the protocone during the mesozoic.
D000818:Animals; D005075:Biological Evolution; D003768:Dental Occlusion, Centric; D008322:Mammals; D008409:Mastication; D008963:Molar / Q000033:anatomy & histology / Q000254:growth & development*; D014072:Tooth Abrasion / Q000209:etiology