Figure 1.

Results of phylogenetic analyses. (a) Maximum-likelihood (ML) phylogram using Sphenodon and representatives of all major squamate clades (not shown) to root dibamids. Numbers above branches are ML bootstraps and asterisks below branches signify unrooted/relaxed-clock Bayesian posterior probabilities greater than 0.95 (topologies were concordant across analyses). Note the marked BL asymmetry across the root resulting from outgroup rooting. (b) Tree rooted without outgroups using a Bayesian relaxed-clock method. Asterisks below branches signify Bayesian posterior probabilities of 1.0.