procaryotes Domain Bacteria Woese et al. 1990 Phylum Nitrospirae Garrity and Holt 2001 Class "Nitrospira" 2001 Order "Nitrospirales" 2001 Family "Nitrospiraceae" 2001 1 Genus Nitrospira Watson et al. 1986 2 Genus Leptospirillum (ex Markosyan 1972) Hippe 2000 3 Genus "Magnetobacterium" Murray and Stackebrandt 1995 4 Genus Thermodesulfovibrio Henry et al. 1994