After Martin & Davis, 2001

Alternative, older, taxonomy after Parker, 1982

<==o Amphipoda Latreille, 1816 (amphipods; katkat)
   |-- Gammaridea Latreille, 1802 (katkamaiset katkat)
   |-- Hyperiidea Milne Edwards, 1830
   |--o Caprellidea Leach, 1814
   |  |-- Cyamidae Rafinesque, 1815 [Cyamida Rafinesque, 1815] (valastäit)
   |  `--o Caprellida Leach, 1814
   |     |--o Phtisicidae Vassilenko, 1968 [incl. Dodecadidae] [Phtisicoidea Vassilenko, 1968]
   |     |  `-- Dodecadinae [Dodecadidae]
   |     `--o Caprelloidea Leach, 1814
   |        |--o Caprellidae Leach, 1814 [incl. Aeginellidae] (kummituskatkat)
   |        |  `-- Aeginellinae [Aeginellidae]
   |        |-- Caprellinoididae Laubitz, 1993
   |        |-- Caprogammaridae Kudrjaschov & Vassilenko, 1966
   |        |-- Paracercopidae Vassilenko, 1968
   |        |-- Pariambidae Laubitz, 1993
   |        `-- Protellidae McCain, 1970
   `--o Ingolfiellidea Hansen, 1903
      |-- Ingolfiellidae Hansen, 1903
      `-- Metaingolfiellidae Ruffo, 1969

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