sphingobacteria (phylum) sphingobacteria (phylum) the fcb group is a superphylum of bacteria named after the main member phyla fibrobacterota, chlorobiota, and bacteroidota. the members are considered to form a clade due to a number of conserved signature indels. for bacteroidota class, see sphingobacteriia. sphingobacteria bacteroides spp. scientific classification domain: bacteria (unranked): fcb group phyla bacteroidota–chlorobiota group bacteroidota balneolota chlorobiota ignavibacteriota rhodothermota "ca. kapabacteria" "ca. kryptonia" calditrichota fibrobacterota gemmatimonadota "ca. aegiribacteria" "ca. cloacimonetes" "ca. delphibacteria" "ca. fermentibacteria" "ca. hydrogenedentes" "ca. latescibacteria" "ca. marinimicrobia" "ca. "zixibacteria" synonyms sphingobacteria cavalier-smith, 1987 cavalier-smith calls the equivalent grouping a phylum by the name of sphingobacteria. it contains the classes chlorobiota, fibrobacterota, bacteroidota, and flavobacteria. however, this megaclassification is not followed by the larger scientific community. fcb group 16s rrna based ltp_12_2021 gtdb 07-rs207 by genome taxonomy database fcb "hydrogenedentes" "fermentibacteria" gemmatimonadota "latescibacteria" fibrobacterota "delphibacteria" "cloacimonetes" "zixibacteria" calditrichota "marinimicrobia" bacteroidota–chlorobiota ignavibacteriota "kryptonia" "kapabacteria" chlorobiota rhodothermota bacteroidota fibrobacterota gemmatimonadota calditrichota ignavibacteriota chlorobiota rhodothermota balneolota bacteroidota "latescibacteria (incl. "handelsmanbacteria") "edwardsbacteria"" "zixibacteria" "eisenbacteria" "krumholzibacteriota" (incl. "delphibacteria") "fermentibacteria" (incl. "aegiribacteria") gemmatimonadota (incl. "glassbacteria") "hydrothermota" (incl. "stahlbacteria", "pyropristinus") "cloacimonetes" fibrobacterota (incl. "raymondbacteria") "delongbacteria" calditrichota "marinisomatota" bacteroidota "kapabacteria" "kryptonia" "ignavibacteriia" "chlorobiia" rhodothermia (incl. balneolales) bacteroidia an analogous situation is seen with the pvc group/planctobacteria. the bacteroidota–chlorobiota group in brown is visible on this 2016 tree of life using ribosomal protein sequences notes