Best tree found in maximum likelihood analyses of sequence data of the two nuclear genes lw rhodopsin and CAD showing the phylogenetic relationships among the Palaearctic species of the leachella group of Megachile (Eutricharaea). Bootstrap support values are based on 1000 bootstrap replicates. The oblique line along the branch joining the outgroup taxa and the ingroup indicates that this branch has been shortened for better graphic representation.