[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 1990 Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980) Class "Clostridia" Garrity et al. 2001 nom. ined. see Class Clostridia Rainey 2010 Order Halanaerobiales corrig. Rainey and Zhilina 1995 Family Halanaerobiaceae corrig. Oren et al. 1984 Genus Halanaerobium corrig. Zeikus et al. 1984 1 Halanaerobium praevalens corrig. Zeikus et al. 1984 2 Halanaerobium acetethylicum corrig. (Rengpipat et al. 1989) Rainey et al. 1995 3 Halanaerobium alcaliphilum corrig. Tsai et al. 1995 4 Halanaerobium congolense corrig. Ravot et al. 1998 5 Halanaerobium fermentans corrig. Kobayashi et al. 2000 6 Halanaerobium kushneri corrig. Bhupathiraju et al. 1999 7 Halanaerobium lacusrosei corrig. Cayol et al. 1995 8 [Halanaerobium saccharolyticum] corrig. (Zhilina et al. 1992) Rainey et al. 1995 9 Halanaerobium salsuginis corrig. Bhupathiraju et al. 1994