FIG 1.

Diverse Myrmica ants harbor Spiroplasma. Shown is a maximum-likelihood phylogram of mitochondrially encoded cytochrome oxidase subunit I (COI) nucleotide sequences of ants in the genus Myrmica. Gold type indicates taxa screened for Spiroplasma. Species groups are designated by alternately shaded boxes and labeled at the right side of the phylogram. Bold type marks a species group containing one or more screened taxa. Branches are labeled with SH-like approximate likelihood ratio test scores greater than 0.75.