"Candidatus Altarchaeum" is a monotypic genus of ultra-small archaea. It contains the sole species "Ca. Altarchaeum hamiconexum". It is in the monotypic family "Altarchaeaceae", monotypic order "Altarchaeales" and monotypic phylum "Altarchaeota".Parte, A.C., Sardà Carbasse, J., Meier-Kolthoff, J.P., Reimer, L.C. and Göker, M. (2020). List of Prokaryotic names with Standing in Nomenclature (LPSN) moves to the DSMZ. International Journal of Systematic and Evolutionary Microbiology, 70, 5607-5612; DOI: 10.1099/ijsem.0.004332
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