Domain Bacteria
Previously the Eubacteria.
The (Eu)bacteria (which, along with the Archaea form the likely paraphyletic Prokaryota or Monera) are the true bacteria: prokaryotic organisms with a vast and varied biochemical repertoire.
The blue-green algae were the first photosynthetic organisms. The chloroplasts of photosynthetic algae and land plants are also properly placed in this clade.
A hugely diverse group of bacteria, including the enteric bacteria (E. coli, plague, Salmonella), pseudomonads, rickettsias (causing typhus), purple sulfur bacteria and the mitochondria of aerobic eukaryotes.
Burkholderia, Alcaligenes, and many other common soil bacteria.
Rickettsia and its close relatives are the sister group of mitochondria. The Betaproteobacteria also include the purple nonsulfur bacteria, a photosynthetic group.
Photosynthetic purple sulfur bacteria, enterobacteria and pseudomonads.
Possibly polyphyletic group; most famous member is Bdellovibrio, an intracellular parasitoid of other bacteria, once thought to be a possible relative of the mitochondria.
The low G+C Gram positive bacteria, including bacilli (anthrax and Listeria), Clostridium (tetanus) and Streptococcus and Staphylococcus (MRSA).
Chlamydia and relatives.
Probably paraphyletic.
Thermus, Aquifex, Thermotoga, photosynthetic green nonsulfur bacteria and the radio-resistant deinococci, considered to be close to the root of the tree of life by some authorities.
The low G+C Gram positive bacteria, including actinomycetes (source of antibiotics), microbacteria, mycobacteria (leprosy and tuberculosis), Propionibacterium (the bacterium that makes the holes in Emmenthal) and coryneforms.
Bacteria with sphingolipids in their membranes, includes green sulfur bacteria, Bacteroides and flavobacteria.
Helical bacteria with a unique form of locomotion, includes the causative agent of syphilis, Treponema pallidum.