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 Actinomycetales Buchanan 1917 (Approved Lists 1980)
           Suborder Corynebacterineae Stackebrandt et al. 1997
             Family Nocardiaceae Castellani and Chalmers 1919 (Approved Lists 1980)
               1 Genus Gordonia corrig. (ex Tsukamura 1971) Stackebrandt et al. 1989
               2 Genus Micropolyspora Lechevalier et al. 1961 (Approved Lists 1980)
               3 Genus Millisia Soddell et al. 2006
               4 Genus Nocardia Trevisan 1889 (Approved Lists 1980)
               5 Genus Rhodococcus Zopf 1891 (Approved Lists 1980)
               6 Genus Skermania Chun et al. 1997
               7 Genus Smaragdicoccus Adachi et al. 2007
               8 Genus Williamsia Kämpfer et al. 1999