prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Bacteroidetes" Krieg et al. 2012
       Class Sphingobacteriia Kämpfer 2012 [monotypic]
         Order Sphingobacteriales Kämpfer 2012
           Family Sphingobacteriaceae Steyn et al. 1998
             Genus Pseudosphingobacterium Vaz-Moreira et al. 2007