Phylogenetic tree highlighting the position of D. mucosus relative to the other type strains within the family Desulfurococcaceae. The tree was inferred from 1,334 aligned characters [12,13] of the 16S rRNA gene sequence under the maximum likelihood criterion  and rooted in accordance with the current taxonomy. The branches are scaled in terms of the expected number of substitutions per site. Numbers above branches are support values from 1,000 bootstrap replicates  if larger than 60%. Lineages with type strain genome sequencing projects registered in GOLD  are shown in blue, Staphylothermus hellenicus CP002051 and published genomes in bold [17–22].