Order Coleoptera Linnaeus, 1758 - beetles
   Family group Adephaga Clairville, 1806 see Suborder Adephaga Schellenberg, 1806
     Family Dytiscidae Leach, 1815 - predaceous diving beetles
       Subfamily Dytiscinae (Leach, in Brewster, 1815)
         28 Genus Hydaticus Leach, 1817
         29 Genus Graphoderus Dejean, 1833
         29.0 Genus Graphoderes Thomson, 1860 see Genus Graphoderus Dejean, 1833
         30 Genus Acilius Leach, 1817
         31 Genus Dytiscus Linnaeus, 1758
         32 Genus Cybister Curtis, 1827