Phylum Schizoramia Bergström, 1976a see Phylum Arthropoda Siebold, 1848
   Superclass †Proschizoramia Hou & Bergström, 1997
     Class †Paracrustacea Hou & Bergström, 1997
       Order †Canadaspidida Novozhilov, 1960 see Order Hymenocarina Clarke, 1882
         1 Family †Canadaspididae Novozhilov, 1960
         2 Family †Hymenocarididae Haeckel, 1896
         3 Family †Perspicarididae Briggs, 1978