Helicobacter Goodwin et al. 1989 emend. Vandamme et al. 1991 Helicobacter pylori (Fox et al. 1988) Goodwin et al. 1989 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Campylobacterota Waite et al. 2021 Campylobacteria Waite et al. 2017 Campylobacterales Garrity et al. 2006 Helicobacteraceae Garrity et al. 2006 emend. Waite et al. 2017 Helicobacter Goodwin et al. 1989 emend. Vandamme et al. 1991 Helicobacteraceae Garrity et al. 2006 emend. Waite et al. 2017 Thiovulum Hinze 1913 emend. La Rivière 1974 (Approved Lists 1980) Sulfurovum Inagaki et al. 2004 emend. Mino et al. 2014 Sulfuricurvum Kodama and Watanabe 2004 Wolinella Tanner et al. 1981 Sulfurimonas Inagaki et al. 2003 emend. 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