RT Journal Article SR Electronic(1) A1 Pavan, María Elisa A1 Pavan, Esteban E. A1 Glaeser, Stefanie P. A1 Etchebehere, Claudia A1 Kämpfer, Peter A1 Pettinari, María Julia A1 López, Nancy I.YR 2018 T1 Proposal for a new classification of a deep branching bacterial phylogenetic lineage: transfer of Coprothermobacter proteolyticus and Coprothermobacter platensis to Coprothermobacteraceae fam. nov., within Coprothermobacterales ord. nov., Coprothermobacteria classis nov. and Coprothermobacterota phyl. nov. and emended description of the family Thermodesulfobiaceae JF International Journal of Systematic and Evolutionary Microbiology, VO 68 IS 5 SP 1627 OP 1632 DO https://doi.org/10.1099/ijsem.0.002720 PB Microbiology Society, SN 1466-5034, AB The genus Coprothermobacter (initially named Thermobacteroides ) is currently placed within the phylum Firmicutes . Early 16S rRNA gene based phylogenetic studies pointed out the great differences between Coprothermobacter and other members of the Firmicutes , revealing that it constitutes a new deep branching lineage. Over the years, several studies based on 16S rRNA gene and whole genome sequences have indicated that Coprothermobacter is very distant phylogenetically to all other bacteria, supporting its placement in a distinct deeply rooted novel phylum. In view of this, we propose its allocation to the new family Coprothermobacteraceae within the novel order Coprothermobacterales, the new class Coprothermobacteria, and the new phylum Coprothermobacterota, and an emended description of the family Thermodesulfobiaceae ., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.002720