[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       Xiphosura Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802
         Prosomapoda Lamsdell, 2013
           [Class] Xiphosura Latreille, 1802 [monotypic] - horseshoe crabs
             [Order] Xiphosurida Latreille, 1802
               [Suborder] †Belinurina Bergström, 1975
                 Family †Belinuridae Packard, 1886
                   01 Genus †Alanops Racheboeuf, Vannier & Anderson, 2002
                   02 Genus †Anacontium Raymond, 1944
                   03 Genus †Andersoniella Lamsdell, 2020
                   04 Genus †Belinurus Bronn, 1839
                   05 Genus †Euproops Meek, 1867
                   06 Genus †Liomesaspis Raymond, 1944
                   07 Genus †Patesia Bicknell & Smith, 2021
                   08 Genus †Prestwichianella Woodward, 1918
                   09 Genus †Pringlia Raymond, 1944
                   10 Genus †Prolimulus Frič, 1899
                   11 Genus †Stilpnocephalus Selden, Simonetto & Marsiglio, 2019