Terrabacteria (a terra) sunt taxon cui sunt duae fere partes (6157 species) specierum prokaryotorum, inter quas bacteria in phylis gram-positivis? (Actinobacteria et Firmicutes) ac phyla Cyanobacteria, Chloroflexi, et Deinococcus-Thermus.[1][2]
Arbor cladistica:[1][2]
Archaea
Thermotogae
Aquificae
Fusobacteria
Formula:Cladex
Actinobacteria
Deinococcus-Thermus
Cyanobacteria
Chloroflexi
Firmicutes