The FCB group is a superphylum of bacteria named after the main member phyla Fibrobacteres, Chlorobi, and Bacteroidetes.
The members are considered to form a clade due to a number of conserved signature indels.

Cavalier-Smith calls the equivalent grouping a phylum by the name of Sphingobacteria.
It contains the classes Chlorobea (= Chlorobi), Fibrobacteres, Bacteroidetes and Flavobacteria.
However, this megaclassification is not followed by the larger scientific community.

An analogous situation is seen with the PVC group/Planctobacteria.
The FCB group is a superphylum of bacteria named after the main member phyla Fibrobacteres, Chlorobi, and Bacteroidetes. The members are considered to form a clade due to a number of conserved signature indels.
Cavalier-Smith calls the equivalent grouping a phylum by the name of Sphingobacteria. It contains the classes Chlorobea (= Chlorobi), Fibrobacteres, Bacteroidetes and Flavobacteria. However, this megaclassification is not followed by the larger scientific community.
An analogous situation is seen with the PVC group/Planctobacteria.
Sphingobacteria (phylum)