Microcaldus is a monotypic genus of ultra-small archaea. It contains one species, Microcaldus variisymbioticus. It is in the monotypic family Microcaldaceae, monotypic order Microcaldales, monotypic class Microcaldia and monotypic phylum Microcaldota.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 Its name is due to being able to live symbiotically with other microbes.https://lpsn.dsmz.de/species/microcaldus-variisymbioticus
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