Taxonomic Tree

Domain bacteria contains the following...

Acidophiles: This group includes organisms capable of thriving in hyperacidic conditions, most of which have an optimal growth pH of 5 or lower (OGpH<5)

Hyperacidotolerant, near-acidophilic neutriphiles: This group includes organisms that have an OGpH slightly above this (e.g., Nanoarchaeum equitans, OGpH=6) but can nonetheless be found flourishing in hyperacidic environments (pH=0.5-1.5).

Domain: Bacteria

Kingdom: Fibrobacteres/Chlorobi/Bacteroidetes group

Superphylum: Bacteroides/Chlorobi group

Phylum: Bacteroidetes

Class: Bacteroidia

Order: Bacteroidales

Family: Bacteroidaceae

Genus: Bacteroides (39x; 39^-cryo)

Class: Cytophagia

Order: Cytophagales

Family: Cytophagaceae

Genus: Cytophaga (1x; 1^-cryo)

Kingdom: Terrabacteria

Phylum: Actinobacteria

Class: Acidimicrobiia

Order: Acidimicrobiales

Family: Acidimicrobiaceae

Genus: Acidiferrimicrobium (1x; 1^-acido)

Genus: Acidimicrobium (1x; 1^-acido)

Genus: Ferrimicrobium (2x; 2^-acido)

Class: Actinomycetia

Order: Micrococcales

Family: Brevibacteriaceae

Genus: Brevibacterium (36x; 36^-cryo)

Family: Microbacteriaceae

Genus: Cryobacterium (7x; 7^-cryo)

Family: Micrococcaceae

Genus: Arthrobacter (54x; 54^-cryo, ?1^-hypergeo?)

Class: Rubrobacteria

Order: Rubrobacterales

Family: Rubrobacteraceae

Genus: Rubrobacter (8x; 8^-radio)

Phylum: Cyanobacteria/Melainabacteria group

Class: Cyanobacteria

Order: Chroococcidiopsidales

Family: Chroococcidiopsidaceae

Genus: Chroococcidiopsis (?^-radiocryo+?)

Phylum: Deinococcota (formerly Deinococcus-Thermus)

Class: Deinococci

Order: Deinococcales

Family: Deinococcaceae

Genus: Deinococcus (85x; 85^-cryo, 85^-hypobaro, 85^-xero, 85^-radio, ?85+)

Phylum: Firmicutes

Class: Bacilli

Order: Bacillales

Family: Alicyclobacillaceae

Genus: Alicyclobacillus (1x; 1^-thermo, 1^-acido, 1^{-thermoacido, 1-spore)}

Family: Bacillaceae

Genus: Bacillus (91x; 91^-spore, 6^-thermo, 1^-acido, ?^{-thermoacido?})

Genus: Virgibacillus (34x; 34^-spore, 9^-halo)

Family: Incertae sedis

Genus: Exiguobacterium (?^-hypobaro)

Class: Clostridia

Order: Eubacteriales

Family: Clostridiaceae

Genus: Anoxynatronum (1x; 1^-alkali)

Genus: Clostridium (155x; 155^-spore)

Family: Peptococcaceae

Genus: Desulfotomaculum (31x; 31^-spore, 17^-thermo, 1^-alkali, 3^-halo, ?^-poly?)

Family: Incertae sedis

Genus: Sulfobacillus (5x; 5^-acido, 5^-spore)

Kingdom: Bacteria Incertae sedis → acidobacteria/acidobacteriota

Phylum: Acidobacteria/acidobacteriota

Class: Acidobacteriia

Order: Acidobacteriales

Family: Acidobacteriaceae

Genus: Acidobacterium (2x; 2^-acido)

Genus: Bryocella (1x; 1^-acido)

Genus: Telmatobacter (1x; 1^-acido)

Kingdom: Bacteria Incertae sedis → aquificae

Phylum: Aquificae

Class: Aquificidae

Order: Aquificales

Family: Aquifaceae

Genus: Aquifex (2x; 2^-thermo)

Genus: Hydrogenobacter (3x; 3^-thermo, 2^-acido, 2^-thermoacido)

Genus: Hydrogenobaculum (1x; 1^-thermo, 1^-acido, 1^-thermoacido)

Kingdom: Bacteria Incertae sedis → desulfobacteriota

Phylum: Desulfobacteriota

Class: Thermodesulfobacteria

Order: Thermodesulfobacteriales

Family: Thermodesulfobacteriaceae

Genus: Geothermobacterium (1x; 1^-thermo)

Kingdom: Bacteria Incertae sedis → nirospirae

Phylum: Nitrospirae

Class: Nitrospira

Order: Nitrospirales

Family: Nitrospiraceae

Genus: Leptospirillum (3x; 3^-acido)

Kingdom: Bacteria Incertae sedis → proteobacteria

Phylum: Proteobacteria

Class: Acidithiobacilla

Order: Acidithiobacillales

Family: Acidithiobacillaceae

Genus: Acidithiobacillus (7x; 7^-acido)

Class: Alphaproteobacteria

Order: Rhodospirallales

Family: Acetobacteraceae

Genus: Acetobacter (29x; 29^-acido)

Genus: Acidiphilium (6x; 6^-acido)

Genus: Acidocella (3x; 3^-acido)

Genus: Acidomonas (1x; 1^-acido)

Order: Hyphomonadales

Family: Hyphomonadaceae

Genus: Hyphomonas (11x; 11^-cryo)

Class: Betaproteobacteria

Order: Burkholderiales

Family: Alcaligenaceae

Genus: Achromobacter (22x; 22^-cryo)

Genus: Alcaligenes (4x; 4^-cryo)

Family: Comamonadaceae

Genus: Thiomonas (1x; 1^-acido)

Order: Neisseriales

Family: Chromobacteriaceae

Genus: Aquaspirillum (6x; 6^-cryo)

Order: Nitrosomonadales

Family: Gallionellaceae

Genus: Gallionella (1x; 1^-acido)

Family: Thiobacillaceae

Genus: Thiobacillus (4x; 4^-acido)

Class: Gammaproteobacteria

Order: Alteromonadales

Family: Alteromonadaceae

Genus: Alteromonas (29x; 29^-cryo)

Family: Colwelliaceae

Genus: Colwellia (23x; 23^-cryo)

Order: Chromatiales

Family: Ectothiorhodospiraceae

Genus: Halorhodospira (1x; 1^-alkali, 1^-halo, 1^-haloalkali)

Genus: Thiohalospira (1x; 1^-alkali, 1^-haloacido, 1^-haloalkali)

Order: Pseudomonadales

Family: Moraxellaceae

Genus: Psychrobacter (35x; 35^-cryo, 35^-radio)

Family: Pseudomonadaceae

Genus: Pseudomonas (5x; 5^-cryo)

Clade: Delta/Epsilon subdivisions

Class: Deltaproteobacteria

Order: Desulfobacterales

Family: Desulfobacteraceae

Genus: Desulfobacter (1x; 1^-acido)

Genus: Desulfosarcina (1x; 1^-acido)

Family: Desulfobulbaceae

Genus: Desulfobulbus (5x; 5^-halo)

Order: Desulfovibrionales

Family: Desulfomicrobiaceae

Genus: Desulfomicrobium (2x; 1^-thermo, 1^-acido+)

Family: Desulfovibrionaceae

Genus: Desulfovibrio (3x; 1^-thermo, 1^-acido, 1^-halo)

Class: Epsilonproteobacteria

Order: Campylobacterales

Family: Helicobacteraceae

Genus: Helicobacter (1x; 1^-acido)

Kingdom: Bacteria Incertae sedis → thermotogae

Phylum: Thermotogae

Class: ???

Order: Thermotogales

Family: Thermotogaceae

Genus: Thermotoga (11x; 11^-thermo)