N'okpuru phylogenetic nomenclature, a na-akọwa dinosaurs dị ka otu nke mejupụtara nna nna kachasị ọhụrụ (MRCA) nke Triceratops na Neornithes, na ụmụ ya niile. A tụkwara aro na a ga-akọwa Dinosauria n'ihe gbasara MRCA nke Megalosaurus na Iguanodon, n'ihi na ndị a bụ abụọ n'ime ụdị atọ ahụ Richard Owen kwuru mgbe ọ ghọtara Dinosauria. Nkọwa abụọ ahụ na-eme ka otu ụdị ụmụ anụmanụ a kọwara dị ka dinosaurs: "Dinosauria = Ornithischia + Saurischia", gụnyere ankyloproposaurians (armored herbivorous quadruped), stegoposaurians (plated herbivorous quadrupeds), ceratopsians (herbivorous quadrupeds with horns and horns), na frognithopeds (frognitopeds), ma ọ bụ frognitopeds (frognitopeds), ma ọ bụ frognitopods (frognitopods), nke ndị ọkà mmụta ihe ọmụmụ na-atụ aro ogologo oge gara aga
nna ochie kachasị ọhụrụ (MRCA) nke Triceratops na Neornithes, na ụmụ ya niile