prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Negativicutes Marchandin et al. 2010
         Order Veillonellales Campbell et al. 2015 [monotypic]
           1 Family Veillonellaceae Rogosa 1971 (Approved Lists 1980)