After Hou & Bergström, 1997

<==o †Paracrustacea Hou & Bergström, 1997
   `--o †Canadaspidida Novozhilov in Orlov, 1960 [incl. Hymenostraca Rolfe, 1969; Prophyllocarida Simonetta & Delle Cave, 1975]
      |--o †Canadasipididae Novozhilov in Orlov, 1960
      |  `--o †Canadaspis Novozhilov in Orlov, 1960 [Hymenocaris Salter, 1853]
      |     |-- †C. perfecta (Walcott, 1912) [Hymenocaris perfecta Walcott, 1912]
      |     `-- †C. laevigata (Hou & Bergström, 1991) [Perspicaris? laevigata Hou & Bergström, 1991]
      |--o †Hymenocarididae Haeckel, 1896 [=? Canadaspididae]
      |  `-- †Hymenocaris vermicauda Salter, 1853
      `--o †Perspicarididae Briggs, 1978
         `--o †Perspicaris Briggs, 1977
            |-- †P. recondita Briggs, 1977
            |?- †P.? dilatus Robison & Richards, 1981
            |?- †P.? ellipsopelta Robison & Richards, 1981
            `?- †P.? laevigata Hou & Bergstrom, 1991

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