[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Appendiculata {Lankester}
         Branch Gnathopoda Straus-Durkheim, 1829
           Grade Condylopoda
             Class Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
               Grade Entomostraca
                 Order Branchiopoda Latreille, 1817
                   1 Genus Daphnia Müller, 1785
                   2 Genus Apus Cuvier, 1798, nom. nud. see Genus Triops Schrank, 1803