prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Firmicutes" (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval. see Phylum Bacillota Gibbons and Murray 2021
       Class Negativicutes Marchandin et al. 2010
         Order Veillonellales Campbell et al. 2015 [monotypic]
           Family Veillonellaceae Rogosa 1971 (Approved Lists 1980)
             1 Genus Allisonella Garner et al. 2003 see Genus Dialister (ex Bergey et al. 1923) Moore and Moore 1994
             2 Genus Anaeroglobus Carlier et al. 2002 see Genus Megasphaera Rogosa 1971 (Approved Lists 1980)
             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
             6 Genus Quinella Krumholz et al. 1993
             7 Genus Sporotalea Boga et al. 2007 see Genus Pelosinus Shelobolina et al. 2007
             8 Genus Veillonella Prévot 1933 (Approved Lists 1980)