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(Gr. baktêria: stick) The domain comprising the kingdom Eubacteria.


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The Kingdom Bacteria is a member of the Domain Bacteria. Here is the complete "parentage" of Bacteria:

The Kingdom Bacteria is further organized into finer groupings including:


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Actinobacteria are a group of Gram-positive bacteria with high guanine and cytosine content. They can be terrestrial or aquatic. Actinobacteria is one of the dominant phyla of the bacteria. Analysis of glutamine synthetase sequence has been suggested for phylogenetic analysis of Actinobacteria. [more]




The phylum Bacteroidetes is composed of three large classes of bacteria that are widely distributed in the environment, including in soil, in sediments, sea water and in the guts and on the skin of animals. [more]






Chloroflexi is a temporary taxon name for: [more]


Cyanobacteria (English pronunciation: ; also known as blue-green algae, blue-green bacteria, and Cyanophyta) is a phylum of bacteria that obtain their energy through photosynthesis. The name "cyanobacteria" comes from the color of the bacteria (Greek: ??a??? (kyan?s) = blue). [more]


The Deinococcus-Thermus are a small group of bacteria composed of cocci[] highly resistant to environmental hazards. [more]


The Firmicutes (Latin: firmus, strong, and cutis, skin , referring to the cell wall) are a phylum of bacteria, most of which have Gram-positive cell wall structure. A few, however, such as Megasphaera, Pectinatus, Selenomonas and Zymophilus, have a porous pseudo-outer-membrane that causes them to stain Gram-negative. Scientists once classified the Firmicutes to include all Gram-positive bacteria, but have recently defined them to be of a core group of related forms called the low-G+C group, in contrast to the Actinobacteria. They have round cells, called cocci (singular coccus), or rod-like forms (bacillus). [more]




The Gemmatimonadetes are a family of bacteria, given their own phylum (Gemmatimonadetes). The first member of this phylum was discovered in 2003 in activated sludge in a sewage treatment system. The bacteria was named Gemmatimonas aurantiaca and is a gram-negative rod-shaped aerobe that appears to replicate by budding. [more]


Lentisphaerae is a phylum of bacteria closely related to Chlamydiae and Verrucomicrobia. [more]




The Proteobacteria are a major group (phylum) of bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, and many other notable genera. Others are free-living, and include many of the bacteria responsible for nitrogen fixation. [more]


Spirochaetes (also spelled Spirochetes) belong to a of distinctive Gram-negative bacteria, which have long, helically coiled (spiral-shaped) cells. Spirochetes are chemoheterotrophic in nature, with lengths between 5 and 250 µm and diameters around 0.1-0.6 µm.[citation needed] [more]

At least 237 species and subspecies belong to the Phylum Spirochaetes.

More info about the Phylum Spirochaetes may be found here.


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Last Revised: August 22, 2014
2014/08/22 04:54:30