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)
                       Genus Megasphaera Rogosa 1971 (Approved Lists 1980)
                         1 Megasphaera cerevisiae Engelmann and Weiss 1986
                         2 Megasphaera elsdeniiᵀ (Gutierrez et al. 1959) Rogosa 1971 (Approved Lists 1980)
                         3 Megasphaera indica Lanjekar et al. 2014
                         4 Megasphaera micronuciformis Marchandin et al. 2003
                         5 Megasphaera paucivorans Juvonen and Suihko 2006
                         6 Megasphaera sueciensis Juvonen and Suihko 2006