Natural Classification of Bacteria

The second edition of Bergey's manual, published in Bergey's honor after his death had a more natural classification. There were over 40 phylums.
==Cyanobacteria==
A cyan colored bacteria that is photosynthetic and that will usually stain gram negative.
==Actinobacteria==
Actinobacteria is a new phylum that was developed because DNA evidence suggested that they belonged together. They all had a high guanine and cytosine ratio, and were consistent with gram positive bacteria.
Bacteria that fall into this category are mycobacterium and corynebacterium.
==Firmicutes==
Firmucutes are gram positive bacteria that have a low G+C ratio.
Staphylococcus, streptococci, bacilli, clostridium tetani, and mycoplasma all fall into this category
==Proteobacteria==
Proteobacteria are huge group that mostly consist of bacteria that will stain gram 'negative'.
Examples are E. coli, Klebsiella, Neisseria, Rickettsiae.
==Chlamydiae==
Chlamydiae are gram negative and include the Chlamydia trachomatis, which causes the STD chlamydia. About half the people with gonorrhea also have chamydia.
==Spirochetes==
Gram negative worm-like bacteria that include Treponema and Borellia.