branching order of bacterial phyla (rappe and giovanoni, 2003) branching order of bacterial phyla (rappe and giovanoni, 2003) there are several models of the branching order of bacterial phyla, the most cited of these was proposed in 1987 paper by carl woese. this cladogram was later expanded by rappé and giovanoni in 2003 to include newly discovered phyla. clear names are added in parentheses, see list of bacterial phyla. aquificae desulfurobacterium op1 (acetothermia) dictyoglomus thermotogae coprothermobacter thermodesulfobacteria deinococcus-thermus spirochaetes synergistes caldiserica pvc superphylum poribacteria planctomycetes op3 (omnitrophica) chlamydiae lentisphaerae verrucomicrobia (planctobacteria) nkb19 (hydrogenedentes) ws3 (latescibacteria) brc1 (sumerlaeota) fusobacteria cyanobacteria ws2 op9 (atribacteria) firmicutes nc10 actinobacteria sc4 armatimonadetes fcb group bacteroidetes chlorobi marine group a (marinimicrobia) caldithrix fibrobacteres gemmatimonadates (sphingobacteria) proteobacteria sbr1093 chrysiogenes arsenatis deferribacteres tm6 (dependentiae) elusimicrobia nitrospira os-k op8 (aminicenantes) acidobacteria chloroflexi aby1 (od1-aby1 of parcubacteria) bd1-5 group (gracilibacteria) op11 (microgenomates) ws6 (dojkabacteria) tm7 (saccharibacteria) sc3 ws5 guaymas1 main article: bacterial phyla