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Dichotomous Key/Bacteria

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Include the cyanobacteria (autotrophic) and eubacteria (heterotrophic).

  • Acidobacteria (acidophilic, gram positive, high G+C, common in dirt)
  • Actinobacteria (high G+C gram positive bacteria)
  • Aquificae (hyperthermophilic chemolithoautotrophs, gram negative)
  • Bacteroidetes (really diverse group with pathogens, commensals, and free-living bacteria; anaerobic, gram negative, rod shaped)
  • Chlamydiae (obligate intracellular parasites of eukaryotic cells, gram negative)
  • Chlorobi (anaerobic, photoautotrophic, gram negative green sulfur bacteria)
  • Chloroflexi (greeen nonsulfur bacteria)
  • Chrysiogenetes (chemolithoautotrophic bacterium)
  • Cyanobacteria (oxygenic photosynthetic bacteria and chloroplasts)
  • Deferribacteres (aquatic, anaerobic bacteria)
  • Deinococcus-Thermus (extremophiles, gram negative)
  • Dictyoglomi (thermophilic chemoorganotrophs)
  • Fibrobacteres (cellulose digesting, anaerobic rumen bacteria, two species)
  • Firmicutes (low G+C gram positives)
  • Fusobacteria (obligate anaerobic heterotrophs, many involved in human infections, gram negative, non-spore forming)
  • Gemmatimonadetes (Gram negative bacteria lacking DAP in cellular envelopes)
  • Nitrospira (gram negative; includes nitrite-oxicizers, thermophilic sulfate reducers, and acidophilic iron reducers)
  • Planctomycetes (ovoid gram negative bacteria, reproduce by budding)
  • Proteobacteria (purple bacteria and relatives, gram negative)
  • Spirochaetes (spiral-shaped chemoheterotrophs, gram negative)
  • Synergistetes (gram negative, rod/vibroid cell shape)
  • Tenericutes (gram positive, no cell wall)
  • Thermodesulfobacteria (thermophilic, sulfate-reducing bacteria)
  • Thermomicrobia (hyperthermophilic chemoheterotrophs)
  • Thermotogae (hyperthermophilic, obligate anaerobic, fermentive heterotrophs)
  • Verrucomicrobia (terrestrial, aquatic, some associated with eukaryotic hosts; gram negative)