Arthropoda Siebold, 1848 - arthropods
   Euarthropoda
     Subphylum Chelicerata Heymons, 1901
       Euchelicerata Weygoldt & Paulus, 1979
         Prosomapoda Lamsdell, 2013
           1 Genus †Weinbergina Richter & Richter, 1929
           2.1.1 Genus †Venustulus Moore, 2005
           2.1.2 Genus †Camanchia Moore, Briggs, Braddy & Shultz, 2011
           2.2.1 Genus †Legrandella Eldredge, 1974
           2.2.2.1 Planaterga Lamsdell, 2013
           2.2.2.2 Xiphosura Latreille, 1802 - horseshoe crabs
           3 ?Genus †Andarella Lamsdell, 2013, orth. inval. see Genus Anderella Moore, McKenzie & Lieberman, 2007
           4 ?Genus †Borchgrevinkium Novojilov, 1958