Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Negativicutes Marchandin et al. 2010 [monotypic]
                   Order Veillonellales Campbell et al. 2015 [monotypic]
                     Family Veillonellaceaeᵀ Rogosa 1971 (Approved Lists 1980)
                       1 Genus Allisonella Garner et al. 2003 [monotypic]
                       2 Genus Anaeroglobus Carlier et al. 2002 [monotypic]
                       3 Genus Dialister (ex Bergey et al. 1923) Moore and Moore 1994
                       4 Genus Megasphaera Rogosa 1971 (Approved Lists 1980)
                       5 Genus Negativicoccus Marchandin et al. 2010 [monotypic]
                       6 Genus Quinella Krumholz et al. 1993 [monotypic]
                       7 Genus Veillonellaᵀ Prévot 1933 (Approved Lists 1980)