Fig. 5. Constructed topology based on the revised bibliography (see SOM). A. Phylogenetic topology comprising the ornithischian dinosaurs with known enamel micromorphology, indicating the represented major ornithischian lineages and the enamel characters recovered as synapomorphic of different groups (which can be optimized). B–L. Optimized character states in the topology expressed as different colours. Minimum enamel thickness (B), maximum enamel thickness (C), parallel crystallite enamel (D), columnar enamel (E), basal unit layer (F), incrementing lines (G), wavy enamel (H), tubules I), micro-ornamentation on the enamel surface (J), enamel voids (K), enamel symmetry (L). Abbreviations: A, Ankylosauria; An, Ankylosauridae; C, Cerapoda; Ce, Ceratopsia; Ch, Chasmosaurinae; Cs, Centrosaurinae; D, Dryomorpha; G, Genasauria; H, Hadrosauridae; Hd, Hadrosauroidea; Hf, Hadrosauriformes; Ig, Iguanodontia; L, Lambeosaurinae; Ma, Marginocephalia; N, Nodosauridae; Nc, Neoceratopsia; O, Ornithischia; Or, Ornithopoda; S, Saurischia; Sph, Saurolophinae; St, Stegosauria.