After Parker, 1982 and Martin & Davis, 2001

<==o Halocyprida Dana, 1853
   |--o Cladocopina Sars, 1865
   |  `--o Polycopoidea Sars, 1865
   |     `-- Polycopidae Sars, 1865
   `--o Halocypridina Dana, 1853
      |--o Halocypridoidea Dana, 1853
      |  `-- Halocyprididae Dana, 1853
      `--o Thaumatocypridoidea Müller, 1906
         `-- Thaumatocyprididae Müller, 1906

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