Domain Bacteria Woese et al. 1990
   Phylum Actinobacteria Garrity and Holt 2001
     Class Actinobacteria Stackebrandt et al. 1997
       Subclass Actinobacteridae Stackebrandt et al. 1997 see Class Actinobacteria Stackebrandt et al. 1997
         Order Actinomycetales Buchanan 1917 (Approved Lists 1980)
           Suborder Corynebacterineae Stackebrandt et al. 1997
             1 Family Corynebacteriaceae Lehmann and Neumann 1907 (Approved Lists 1980)
             2 Family Dietziaceae Rainey et al. 1997
             3 Family Gordoniaceae Rainey et al. 1997 see Family Nocardiaceae Castellani and Chalmers 1919 (Approved Lists 1980)
             4 Family Mycobacteriaceae Chester 1897 (Approved Lists 1980)
             5 Family Nocardiaceae Castellani and Chalmers 1919 (Approved Lists 1980)
             6 Family Tsukamurellaceae Rainey et al. 1997
             7 Family "Williamsiaceae" see Family Nocardiaceae Castellani and Chalmers 1919 (Approved Lists 1980)