Results from a test of molecular clocks using the Maximum Likelihood method.

The molecular clock test was performed by comparing the ML value for the given topology with and without the molecular clock constraints under Poisson model [32]. The null hypothesis of equal evolutionary rate throughout the trees were rejected at a 5% significance level (P<<0.05). The analysis involved 36 amino acid sequences. All positions containing gaps and missing data were eliminated. There were a total of 88 positions in the final dataset. Evolutionary analyses were conducted in MEGA5 [24].