Bootstrap resampling analyses with 1000 replicates were performed for the neighbour-joining, maximum-likelihood and maximum-parsimony analyses to estimate the confidence of
the tree topologies. MEGA 4.0 (Tamura et al., 2007) was used for the neighbour-joining and maximum-parsimony analyses and PHYML 2.4.5 (Guindon & Gascuel, 2003) was used for the maximum-likelihood analysis.