prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 Domain "Archaea" Woese et al. 1990 Phylum "Crenarchaeota" Garrity and Holt 2001 [monotypic] Class Thermoprotei Reysenbach 2002 Order Fervidicoccales Perevalova et al. 2010 [monotypic] Family Fervidicoccaceae Perevalova et al. 2010 [monotypic] Genus Fervidicoccus Perevalova et al. 2010