Fig. 1.—

Maximum-likelihood cladogram (left) and phylogram (right) based on amino acid sequences of eight loci from 30 strains of Hamiltonella defensa, five strains of Regiella insecticola and selected outgroups. Taxon labels for H. defensa and R. insecticola indicate the name of the strain in parenthesis followed by the name of the aphid or whitefly host species. Taxon labels for outgroups indicate the species name and strain if appropriate. Bold font identifies the four strains of H. defensa from Acyrthosiphon pisum sequenced during the current study plus the reannotated 5AT strain. Numbers at nodes indicate support based on the percentage of 100 bootstrap replicates that recovered the same node. Scale bar for the phylogram indicates nucleotide substitutions per site.