After Jenner, Hof & Schram, 1998

<==o Hoplocarida Calman, 1904 (mantis shrimps and relatives; sirkkaäyriäismäiset)
   |--o †Aeschronectida Schram, 1969
   |  |?- †Crangopsis
   |  |?- †Joanellia
   |  |--o †Aenigmacarididae Schram & Horner, 1978
   |  |  `-- †Aenigmacaris
   |  |--o †Aratidecthidae Schram, 1979
   |  |  `-- †Aratidecthes johnsoni Schram, 1969
   |  `--o †Kallidecthidae Schram, 1969
   |     `-- †Kallidecthes richardsoni Schram, 1969
   `==o †Palaeostomatopoda Brooks, 1962 [paraphyletic]
      |?- †Eopteridium
      |--o †Archaeocaris Meek, 1872
      |  |-- †A. graffhami
      |  `-- †A. vermiformis
      `--+--o †Perimecturidae Peach, 1908
         |  |-- †Bairdops elegans (Peach, 1908) Schram, 1979
         |  `--+-- †Bairdops beargulchensis (Schram & Horner, 1978) Schram, 1979
         |     `--o †Perimecturus Peach, 1908
         |        |-- †P. rapax Schram & Horner, 1978(?)
         |        `-- †P. parki (Peach, 1882)
         `-- Stomatopoda Latreille, 1817 (Mantis shrimps; sirkkaäyriäiset)

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