[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
           Planaterga Lamsdell, 2013
             Family †Bunodidae Packard, 1886
               Genus †Pasternakevia Selden & Drygant, 1987