prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Actinobacteria" Garrity and Holt 2001
       Class Actinobacteria Stackebrandt et al. 1997
         Order Frankiales Sen et al. 2014
           1 Family Cryptosporangiaceae Zhi et al. 2009
           2 Family Frankiaceae Becking 1970 (Approved Lists 1980)
           3 Family Sporichthyaceae Rainey et al. 1997 [monotypic]
           4 Genus Motilibacter Lee 2012, incertae sedis