FIG. 1.

Phylogram of partial 16S rRNA genes of an Amblyomma americanum bacterium (accession number AY939824) and selected other γ-proteobacteria: Coxiella burnetii bacterium (NC_002971), Haemaphysalis longicornis bacterium (AY342035), Rhipicephalus sanguineus bacterium (D84559), Ornithodoros moubata bacterium (AB001521), a marine dinoflagellate bacterium (AB058918), Rickettsiella grylli (U97547), a Rickettsiella sp. of Ixodes woodi (AF383621), the protozoan-associated bacterium Aquicella siphonis (AY359283), Legionella pneumophila (NC_006369), Legionella anisa (AY744776), Methylococcus capsulatus (NC_002977), and Escherichia coli K-12 (NC_000913). Nucleotide positions with gaps in the aligned sequences were excluded. Bootstrap values of nodes with >80% values by maximum likelihood (500 replicates; shown above the line) or neighbor-joining (1,000 replicates; shown below the line) distance criteria are indicated and were estimated using PHYLO_WIN phylogenetic analysis software (http://pbil.univ-lyon1.fr/software/phylowin.html). Bar, nucleotide distance.