prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 Domain "Bacteria" Woese et al. 1990 Phylum "Chloroflexi" Garrity and Holt 2001 Class Thermomicrobia Garrity and Holt 2002 [monotypic] Subclass Sphaerobacteridae Stackebrandt et al. 1997 Order Thermomicrobiales Garrity and Holt 2002 [monotypic] Family Thermomicrobiaceae Garrity and Holt 2002 [monotypic] Genus Thermomicrobium Jackson et al. 1973 (Approved Lists 1980)