The Katanobacteria phylum was first proposed in 2008 following the analysis of 16S rRNA gene sequences from a mesophilic anaerobic digester.[1] The name "Katanobacteria" comes from the Hebrew word "katan", which translates to "small".[2] This is presumably a nod to the small cell size and/or genome size of members of this phylum (and most members of the CPR).
^Hug, Laura A.; Baker, Brett J.; Anantharaman, Karthik; Brown, Christopher T.; Probst, Alexander J.; Castelle, Cindy J.; Butterfield, Cristina N.; Hernsdorf, Alex W.; Amano, Yuki; Ise, Kotaro; Suzuki, Yohey (2016-04-11). "A new view of the tree of life". Nature Microbiology. 1 (5): 16048. doi:10.1038/nmicrobiol.2016.48. ISSN2058-5276. PMID27572647.