Domain Bacteria Woese et al. 1990
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   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
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     Class "Deltaproteobacteria" Garrity et al. 2001 nom. ined. see Class Deltaproteobacteria Kuever et al. 2006
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       Order "Syntrophobacterales" see Order Syntrophobacterales Kuever et al. 2006
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         Family "Syntrophaceae" see Family Syntrophaceae Kuever et al. 2006
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           Genus Smithella Liu et al. 1999
          Count: -