Appendix S1. GenBank accession numbers used in phylogenetic tree reconstruction.

Appendix S2. Assessment of Type I error in statistical methods employed in this study.

Appendix S3. Analysis on alternative data set with multiple measurements per species for Phrynosomatinae and Anolis.

Appendix S4. Testing the assumption of Brownian motion.

Appendix S5. McPeek's (1995) method and the present study.

Table S1. Phylogenetic Analyses of Variance for data set containing multiple individuals for Anolis and phrynosomatines.

Table S2. Regression test for Brownian motion evolution.

Table S3. K-test for Brownian motion evolution.

Table S4. Relative head depth and changes in relative head depth

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