The "Aigarchaeota" are a proposed archaeal phylum of which the main representative is Caldiarchaeum subterraneum.[2] It is not yet clear if this represents a new phylum or a Nitrososphaerota order, since the genome of Caldiarchaeum subterraneum encodes several Nitrososphaerota-like features.[3] The name "Aigarchaeota" comes from the Greekαυγή, avgí, meaning "dawn" or "aurora", for the intermediate features of hyperthermophilic and mesophilic life during the evolution of its lineage.[2]
^(2020) Christian Rinke, Maria Chuvochina, Aaron J. Mussig, Pierre-Alain Chaumeil, Adrian A. Davin, David W. Waite, William B Whitman, Donovan H. Parks, Philip Hugenholtz, Resolving widespread incomplete and uneven archaeal classifications based on a rank-normalized genome-based taxonomy
^Brochier-Armanet, Celine; Forterre, Patrick; Gribaldo, Simonetta (June 2011). "Phylogeny and evolution of the Archaea: One hundred genomes later". Current Opinion in Microbiology. 14 (3): 274–281. doi:10.1016/j.mib.2011.04.015. PMID21632276..