prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval. Domain "Archaea" Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024 Phylum "Euryarchaeota" Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024 Class "Methanomicrobia" Garrity et al. 2005 nom. inval. Order Methanocellales Sakai et al. 2008 [monotypic] Family Methanocellaceae Sakai et al. 2008 [monotypic] Genus Methanocella Sakai et al. 2008