Phylogenetic tree based comparisons between 16S rRNA gene sequences from strain HIMB100, Candidatus Puniceispirillum marinum IMCC1322, and type strains of related species within the family Rhodospirillaceae. Sequence selection and alignment improvements were carried out using the ‘All-Species Living Tree’ project database  and the ARB software package . The tree was inferred from 1,206 alignment positions using the RAxML maximum likelihood method . Support values from 100 bootstrap replicates, determined by RAxML , are displayed above branches if larger than 60%. The scale bar indicates substitutions per site.