Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Superphylum Articulata Cuvier see Supraphylum Articulata Cuvier
           Phylum Arthropoda Siebold, 1848 - arthropods
             Subphylum Chelicerata Heymons, 1901
               1 Class Merostomata Dana, 1852 - horseshoe crabs see Class Xiphosura Latreille, 1802
               2 Class Arachnida Lamarck, 1801
               3 Class Pantopoda Gerstäcker, 1863 see Order Pantopoda Gerstäcker, 1863