Acid X-Philes

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

Acidophilic Archaea & Hyperacidotolerant, Near-Acidophilic Archaeal Neutriphiles
This group includes archaea capable of thriving in hyperacidic conditions, most of which have an optimal growth pH of 5 or lower (OGpH≤5), although a few 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).

Acidophilic Bacteria & Hyperacidotolerant, Near-Acidophilic Bacterial Neutriphiles
This group includes bacteria capable of thriving in hyperacidic conditions, most of which have an optimal growth pH of 5 or lower (OGpH≤5), although a few have an OGpH slightly above this but can nonetheless be found flourishing in hyperacidic environments (pH=0.5-1.5).

Here organisms are listed first by the upper end of their temperature range, then by OGT, then by the lower end of their temperature range, and for any organisms for which these properties are unknown or the same, they will be listed in alphabetical order.

Archaea

Euryarchaeota

Thermococci

Thermococcales

Thermococcaceae

Thermococcus

Proteoarchaeota

Domain: Bacteria

Phylum: Actinobacteria

Class: Actinobacteridae

Order: Actinomycetales

Family: Microbacteriaceae

Genus: Cryobacterium

Phylum: Firmicutes

Class: Bacilli

Order: Bacillales

Family: Bacillaceae

Genus: Bacillus

Order: Lactobacillales

Family: Carnobacteriaceae

Genus: Carnobacterium

Class: Clostridia

Order: Clostridiales

Family: Clostridiaceae

Genus: Clostridium ssp.

Phylum: Proteobacterium

Class: Γ-proteobacterium

Order: Enterobacterales

Family: Yersiniaceae

Genus: Serratia ssp.

Genus: Serratia ssp.

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

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