''Candidatus'' Wirthbacteria is a proposed bacterial phylum containing only one known sample from the

Crystal Geyser Crystal Geyser is located on the east bank of the Green River approximately downstream from Green River, Utah, United States. It is a rare example of a cold-water carbon dioxide driven geyser; geothermal activity does not play a role in th ...

aquifer, ''Ca. Wirthibacter wanneri''. This bacterium stands out in a basal position in some trees of life as it is closely related to

Candidate phyla radiation The candidate phyla radiation (also referred to as CPR group) is a large evolutionary radiation of bacterial lineages whose members are mostly uncultivated and only known from metagenomics and single cell sequencing. They have been described as na ...

but is not considered part of that

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

References

Bacteria described in the 21st century Candidatus taxa Bacteria phyla {{Bacteria-stub