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 Micrococcales Prévot 1940 (Approved Lists 1980)
           Family Promicromonosporaceae Rainey et al. 1997
             Genus Xylanimicrobium Stackebrandt and Schumann 2004