Pyrococcus

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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).

“Hypergeophilic genera” and “hypergeotolerant genera” refer here to genera known to include hypergeophilic species and/or species with hypergeotolerances.

Genera containing thermophilic and hyperthermotolerant organisms are marked with an asterisk (*)

Genera containing barophilic and hyperbarotolerant organisms are marked with two asterisks (**)

Genera containing acidophilic and hyperacidotolerant organisms are marked with a dagger (†)

Genera containing alkaliphilic and hyperalkalitolerant organisms are marked with two daggers (††)

Genera containing thermoacidophilic and hyperthermoacidotolerant organisms are marked with an asterisk and a dagger (*†)

Genera containing halophilic and hyperhalotolerant organisms are marked with a double dagger (‡)

Bacteria marked with an asterisk and a degree sign (*°) are endospore-forming polyextremotolerant organisms. Bacterial endospores tend to give the bacteria capable of producing them polyextremotolerance. Endospores are known for being able to survive extremely high doses of radiation, vacuum dessication, extreme heat and cold, lack of nutrients, and in some cases even the passage of hundreds of millions of years (for example, Virgibacillus marismortui (formerly Bacillus marismortui and Bacillus strain 2-9-3) was revived by scientists from 250-million-year-old spores (Vreeland, 2000); for comparison, the first dinosaurs began appearing about 220 MYA — 30 million years later). Although these endospore-forming bacteria can survive a variety of harsh conditions, endospore-formation is not done for reproduction, as with fungal spore formation, but is instead a last-ditch effort to survive conditions the bacterium would not otherwise be able to, which means these critters aren’t true polyextremophiles, because they don’t (necessarily) actually grow better in extreme conditions, and in their endospore form don’t even grow at all.

In addition to other sources cited, much of this information was compiled with the help of NCBI’s Taxonomy Browser.

Domain: Archaea

Phylum: Euryarchaeota

Class: Archaeoglobi

Order: Archaeoglobales

Family: Archaeoglobaceae

Genus: Archaeoglobus *

Class: Stenosarchaea

Order: Candidatus Nanohaloarchaeota

Family: Nanohaloarchaea

Genus: Haloredivivus †‡

Genus: Nanosalina *†‡

Genus: Nanosalinarum †‡

Class: Halobacteria

Order: Halobacteriales

Family: Haloarculaceae

Genus: Haloarcula ‡

Genus: Halorhabdus ‡

Genus: Halorientalis ‡

Genus: Halosimplex ‡

Genus: Natronomonas ††‡

Family: Halobacteriaceae

Genus: Haladaptatus ‡

Genus: Halalkalicoccus ††‡

Genus: Halarchaeum †‡

Genus: Haloalcalophilum ††‡

Genus: Halobacterium ‡

Genus: Halomarina ‡

Genus: Halorussus ‡

Genus: Natronoarchaeum ‡

Genus: Salarchaeum ‡

Family: Halococceae

Genus: Halococcus ‡

Order: Haloferacales

Family: Haloferacaceae

Genus: Halobellus ‡

Genus: Haloferax ‡

Genus: Halopelagius ‡

Genus: Haloplanus ‡

Genus: Haloquadratum ‡

Family: Halorubraceae

Genus: Halobaculum ‡

Genus: Halogeometricum ‡

Genus: Halogranum ‡

Genus: Halolamina ‡

Genus: Halonotius ‡

Genus: Halorubrum ††‡

Order: Natrialbales

Family: Natrialbaceae

Genus: Halobiforma ‡

Genus: Halopiger ‡

Genus: Halostagnicola ‡

Genus: Haloterrigena ‡

Genus: Halovivax ‡

Genus: Natrarchaeobaculum ‡

Genus: Natrialba ††‡+

Genus: Natrinema ‡

Genus: Natronobacterium ††‡

Genus: Natronococcus ††‡

Genus: Natronolimnohabitans ‡

Genus: Natronolimnobius ‡

Genus: Natronorubrum ‡

Class: Methanococci

Order: Methacoccales

Family: Methanococcaceae

Genus: Methanocaldococcus ***

Class: Methanopyri

Order: Methanopyrales

Family: Methanopyraceae

Genus: Methanopyrus *

Class: Thermococci

Order: Thermococcales

Family: Thermococcaceae

Genus: Pyrococcus ***

Genus: Thermococcus ***†††

Class: Thermoplasmata

Order: Methanomassiliicoccales

Family: Methanomassiliicoccaceae

Genus: Methanomassiliicoccus †

Order: Thermoplasmatales

Family: Cuniculiplasmaceae

Genus: Cuniculiplasma †

Family: Ferroplasmaceae

Genus: Acidiplasma †

Genus: Ferroplasma †

Family: Picrophilaceae

Genus: Picrophilus †

Family: Incertae sedis

Genus: Thermogymnomonas †

Superphylum: DPANN group

Phylum: Candidatus Diapherotrites

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Iainarchaeum †

Phylum: Aenigarchaeota

Class: (unnamed?)

Order: Aenigmarchaeales

Family: (unnamed?)

Genus: Aenigmarchaeum †

Phylum: Nanoarchaeota

Class: (unnamed?)

Order: Nanoarchaeales

Family: Nanoarchaeaceae

Genus: Nanoarchaeum *†

Family: Nanopusillaceae

Genus: Nanobsidianus *†

Genus: Nanopusillus *†

Phylum: Incertae sedis

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Mancarchaeum †

Phylum: Candidatus Micrarchaeota

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Micrarchaeum †

Phylum: Candidatus Parvarchaeota

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Parvarchaeum †

Kingdom: Proteoarchaeota

Superphylum: TACK group

Phylum: Thaumarchaeota

Class: Nitrososphaeria

Order: Nitrosopumilales

Family: Nitrosopumilaceae

Genus: Candidatus Nitrosoarchaeum †

Genus: Nitrosopumilus †

Order: Nitrososphaerales

Family: Nitrososphaeraceae

Genus: Candidatus Nitrocosmicus †

Genus: Candidatus Nitrososphaera †

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Nitrosopelagicus †

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Nitrosotalea †

Class: Incertae sedis

Order: Incertae sedis

Family: Incertae sedis

Genus: Candidatus Nitrosotenius †

Phylum: Crenarchaeota

Class: Thermoprotei

Order: Desulfurococcales

Family: Desulfurococcaceae

Genus: Aeropyrum *

Genus: Candidatus Nanopusillus †

Family: Pyrodictiaceae

Genus: Geogemma *

Genus: Pyrolobus *

Order: Sulfolobales

Family: Sulfobaceae

Genus: Acidianus *†

Genus: Metallosphaera *†

Genus: Stygiolobus *†

Genus: Sulfolobus *†

Genus: Sulfurisphaera †

Genus: Sulfurococcus †

Class: Incertae sedis

Order: Cenarchaeales

Family: Cenarchaeaceae

Genus: Cenarchaeum †

Schuerger & Nicholson, 2016.
http://doi.org/10.1089/ast.2016.1587

Nicholson &al., 2013.
https://doi.org/10.1073/pnas.1209793110

Golyshina, O.V.; Yakimov, M.M.; Lunsdorf, H.; Ferrer, M; Nimtz, M.; Timmis, K.N.; Wray, V.; Tindall, B.J.; Golyshin, P.N.; (2009); Acidiplasma aeolicum gen. nov., sp. nov., a euryarchaeon of the family Ferroplasmaceae isolated from a hydrothermal pool, and transfer of Ferroplasma cupricumulans to Acidiplasma cupricumulans comb. nov