Figure 41. The single most parsimonious tree from Figure 40 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 41. The single most parsimonious tree from Figure 40, subjected to minor branch swapping (using Mac- Clade) within the clade Cerapoda [Hypsilophodon, Ankylopollexia, Pachycephalosauridae, and Psittacosauridae]; this part of the tree is not the principal focus of the formal analysis. Tree length: 310 steps. N.B. 'BMNH A100' has recently been formally renumbered NHMUK RU A100.