''Candidatus'' Wirthbacteria is a proposed bacterial phylum containing only one known sample from the Crystal Geyser 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 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 ter ...

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