Maximum likelihood tree of Pristiphora and nematine outgroups based on three genes (3408 bp). Specimens having at least two of the three genes were included. Numbers above branches show bootstrap proportions (%). Support values for weakly supported branches (BP<70) are not shown. Part of Pristiphora is shown without support values and tip labels, which are shown in Fig. 2. The scale bar shows the number of estimated substitutions per nucleotide position.