Bayes Factor (BF) support for four morphological traits and habitat preference.

Bayes Factor (BF) support for ancestral states that earned higher probabilities at the nodes with probability >0.9 for a derived state and nodes I and II for four morphological traits and habitat preference. BFs are based on difference in harmonic means of likelihoods derived from two analyses, where character state at a given node is constrained to be either 0 or 1. BF >2 is considered as positive evidence and BF >5 as strong support for the character state’s gaining the higher likelihood at the node. For character descriptions and coding of characters states and nodes see Fig. 2, Supporting information, Appendix S1, and Fig. S1. Probabilities for derived character states at each node are in the Supporting information Appendix S2 and in Fig. 2.