Phylogenetic tree highlighting the position of S. coccoides relative to the other type strains within the family Spirochaetaceae. The tree was inferred from 1,360 aligned characters [9,10] of the 16S rRNA gene sequence under the maximum likelihood criterion . Rooting was done initially using the midpoint method  and then checked for its agreement with the current classification (Table 1). The branches are scaled in terms of the expected number of substitutions per site. Numbers adjacent to the branches are support values from 500 ML bootstrap replicates  (left) and from 1,000 maximum parsimony bootstrap replicates  (right) if larger than 60% if. Lineages with type strain genome sequencing projects registered in GOLD  are labeled with one asterisk, those also listed as ‘Complete and Published’ with two asterisks (see [16–19], CP002696 for Treponema brennaborense, CP002903 for S. thermophila, and CP002868 for S. caldaria). Also, genomes that are finished but are missing a second asterisk are S. africana CP003282, S. pleomorpha CP003155 and S. globosa CP002541.