Includes a revised taxonomic outline for the phyla Bacteroidetes, Planctomycetes, Chlamydiae, Spirochetes, Fibrobacters, Fusobacteria, Acidobacteria, Verrucomicrobia, Dictyoglomi, and Gemmatomonadetes based upon the SILVA project as well as a description of more than 153 genera in 29 families. Includes many medically important taxa.