Figure 4.

Temporal calibration of single optimal tree discovered in a PAUP heuristic analysis of Diapsida [31]. Black bars are known ranges, open bars are ghost taxa and ghost lineages. Tree length = 873, consistency index (CI) = 0.4605, CI excluding informative characters = 0.4586, retention index = 0.5802, rescaled CI = 0.2672. Clade support indicated by numbers subtending branches (italic numbers = bootstrap support values; roman numbers = Bremer decay values). Neodiapsida is diagnosed by the following unambiguous synapomorphies: lower temporal fenestra is present but open ventrally (character 17, state 2); caniniform teeth absent from maxilla (character 39, state 1); subtemporal process of jugal is slender/narrow (character 91, state 1). Some clades have been condensed into the following taxa (with included terminal taxa): Sauria (Archosauromorpha + Lepidosauromorpha); Tangasauridae (Tangasaurus (Acerosodontosaurus + Hovasaurus)); Younginidae (Thadeosaurus + Youngina).