living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Chelicerata Heymons, 1901
             Class Merostomata Dana, 1852 - horseshoe crabs see Class Xiphosura Latreille, 1802
               Order Xiphosura Latreille, 1802 see Class Xiphosura Latreille, 1802
                 Suborder Xiphosurida R. & E. Richter, 1924 see Order Xiphosurida Latreille, 1802
                   Family Limulidae Leach, 1819
                     Genus Carcinoscorpius Pocock, 1902