Domain: Bacteria ; Archaea

  1. Domain: Bacteria 

    1. Phylum: Proteobacteria - major phylum of gram-negative bacteria 

      1. Escherichia, Salmonella, Vibrio, Rhizobium

    2. Phylum: Cyanobacteria -

      1. Anabaena, Oscillatoria 

    3. Phylum: Spirochaete - spiral gram-negative bacteria 

      1. Treponema

    4. Phylum: Chlamydine - extremely small intracellular pathogen 

      1. Chlamydia 

    5. Phylum: Firmicutes - spore forming bacteria 

      1. Staphylococcus, Bacillus, Clostridium 

    6. Phylum: Thermotogae - thermophilic bacteria 

  2. Domain: Archaea 

    1. Live anywhere bacteria + extreme environments 

    2. Phylum: Crenarchaeota 

      1. Thermophile - extreme high temperature

      2. Acidophiles - live at low pH

    3. Phylum: Euryarchaeota

      1. Methanogen - produce methane by fermentation 

      2. Halophile - live in extreme salt