prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 Domain "Bacteria" Woese et al. 1990 Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980) Class Clostridia Rainey 2010 Order Clostridiales Prévot 1953 (Approved Lists 1980) Family Lachnospiraceae Rainey 2010 Genus Lachnospira Bryant and Small 1956 (Approved Lists 1980)