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Three or four (more) phyla in the super-phyllum?
The text refers to three classes and three groups, whereas it lists four. The name PVC implies that Planctomycetes - Verrucomicrobia - Chlamydiae are constituent members. I have seen phylogenies adding Lentisphaerae to this super-phylum (e.g. Rinke et al. 2013). Already the original suggestion of the PVC super-phylum lists Lentisphaerae as constituent member. We need to note that this later phylum was only described in 2004, while the others were known for quite a while, and even their close relationship was discovered as soon as 16S RNS phylogenies were available.
^Rinke, Christian Schwientek, Patrick Sczyrba, Alexander Ivanova, Natalia N. Anderson, Iain J. Cheng, Jan-Fang Darling, Aaron Malfatti, Stephanie Swan, Brandon K. Gies, Esther A. Dodsworth, Jeremy A. Hedlund, Brian P. Tsiamis, George Sievert, Stefan M. Liu, Wen-Tso Eisen, Jonathan A. Hallam, Steven J. Kyrpides, Nikos C. Stepanauskas, Ramunas Rubin, Edward M. Hugenholtz, Philip Woyke, Tanja (2013). "Insights into the phylogeny and coding potential of microbial dark matter". Nature. 499 (7459): 431–437. doi:10.1038/nature12352.line feed character in |author= at position 17 (help)CS1 maint: Multiple names: authors list (link)
^Wagner, Michael Horn, Matthias (2006). "The Planctomycetes, Verrucomicrobia, Chlamydiae and sister phyla comprise a superphylum with biotechnological and medical relevance". Current Opinion in Biotechnology. 17 (3): 241–249. doi:10.1016/j.copbio.2006.05.005.line feed character in |author= at position 16 (help)CS1 maint: Multiple names: authors list (link)
^Cho, Jang-Cheon Vergin, Kevin L. Morris, Robert M. Giovannoni, Stephen J. (2004). "Lentisphaera araneosa gen. nov., sp. nov, a transparent exopolymer producing marine bacterium, and the description of a novel bacterial phylum, Lentisphaerae". Environmental Microbiology. 6 (6): 611–621. doi:10.1111/j.1462-2920.2004.00614.x.line feed character in |author= at position 16 (help)CS1 maint: Multiple names: authors list (link)