Chelicerata Heymons, 1901
   Xiphosura s. lat. Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802
     Prosomapoda Lamsdell, 2013
       01 Genus †Anderella Moore, McKenzie & Lieberman, 2007
       02 Genus †Borchgrevinkium Novojilov, 1958
       03 Genus †Camanchia Moore, Briggs, Braddy & Shultz, 2011
       04 Genus †Legrandella Eldredge, 1974
       05 Genus †Venustulus Moore, 2005
       06 Family †Weinberginidae Richter & richter, 1929 [monotypic]
       07 Planaterga Lamsdell, 2013
       08 Xiphosura Latreille, 1802 - horseshoe crabs