To refer to this article use this url: http://dpc.uba.uva.nl/ctz/vol81/nr03/art02
Phylogenetic analyses
We used the maximum likelihood algorithm of PhyML (Guindon and Gascuel, 2003) to conduct the phylogenetic analysis, starting with a parsimony tree. Parameterization of PhyML was performed using jModelTest 0.1 (Posada, 2008) to select a model of nucleotide substitution. To quantify branch support, we report confidence values (cv) as the result of an approximate likelihood-ratio test performed by PhyML (Anisimova and Gascuel, 2006). Nodes with cv < 0.5 have been considered as non-resolved and are polytomized.