Table A1. Log-likelihoods and model support for three alternative models for discrete character evolution of non-rock- or rock-dwelling in tropidurid lizards, assuming non-rock-dwelling as the ancestral condition.

ER: equal-rates model, assumes backward and forward transitions between habitat types occur at the same rate. ARD: all-rates different, permits different forward and backward transition rates. Directional: assumes that evolution invariably proceeds from non-rock-dwelling to rock-dwelling, and never the reverse. Even after accounting for model complexity. ARD is the best-supported of these three models.

Model	log(L)	d.f.	AIC
ER	−43.37	1	88.75
ARD	−41.27	2	86.55
Directional	−46.25	1	94.51