[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Chasmataspidida Caster & Brooks, 1956
         Family †Diploaspididae Størmer, 1972
           01 Genus †Achanarraspis Anderson, Dunlop & Trewin, 2000
           02 Genus †Diploaspis Størmer, 1972
           03 Genus †Dvulikiaspis Marshall, Lamsdell, Shpinev & Braddy, 2014
           04 Genus †Forfarella Dunlop, Anderson & Braddy, 1999
           05 Genus †Heteroaspis Størmer, 1972
           06 Genus †Hoplitaspis Lamsdell, Gunderson & Meyer, 2019
           07 Genus †Loganamaraspis Tetlie & Braddy, 2004
           08 Genus †Nahlyostaspis Marshall, Lamsdell, Shpinev & Braddy, 2014
           09 Genus †Octoberaspis Dunlop, 2002
           10 Genus †Skrytyaspis Marshall, Lamsdell, Shpinev & Braddy, 2014