After Parker, 1982, Maddison & Maddison, 1995-1998 [“The Tree of Life”], and Martin & Davis, 2001

<==o Malacostraca Latreille, 1802 (kuoriäyriäiset)
   |-- Phyllocarida Packard, 1879
   |-- Hoplocarida Calman, 1904 (mantis shrimps and relatives; sirkkaäyriäismäiset)
   `--o Eumalacostraca Grobben, 1892
      |-- Syncarida Packard, 1885
      |--o Peracarida Calman, 1904 (amphipods & isopods; katkat ja siirat)
      |  |-- †Pygocephalomorpha
      |  |-- Mysida Haworth, 1825
      |  |-- Thermosbaenacea Monod, 1927
      |  |-- Lophogastrida Sars, 1870
      |  `--+-- Spelaeogriphacea Gordon, 1957
      |     |--+-- Mictacea Bowman, Garner, Hessler, Iliffe & Sanders, 1985
      |     |  `?-o Stygiomysis Caroli, 1937 [Rhopalonurus Gordon, 1958] [Stygiomysida Tchindonova, 1981: Stygiomysidae Caroli, 1937]
      |     |     |-- S. aemete Wagner, 1992
      |     |     |-- S. clarkei Bowman, Iliffe & Yager, 1984
      |     |     |-- S. cokei Kallmeyer & Carpenter, 1996
      |     |     |-- S. holthuisi (Gordon, 1958) [Rhopalonurus holthuisi Gordon, 1958]
      |     |     |-- S. hydruntina Caroli, 1937
      |     |     |-- S. ibarrae Ortiz, Lalana & Perez, 1996
      |     |     `-- S. major Bowman, 1976
      |     |-- Tanaidacea Dana, 1849
      |     |-- Amphipoda Latreille, 1816 (amphipods; katkat)
      |     |-- Cumacea Krøyer, 1846
      |     `-- Isopoda Latreille, 1817 (isopods; aitosiirat)
      `--o Eucarida Calman, 1904 (crabs; ravut)
         |-- Amphionides reynaudii (Milne-Edwards, 1833) Zimmer, 1905 [Amphionidacea Williamson, 1973: Amphionididae Holthuis, 1955]
         |-- Euphausiacea Dana, 1852 (krills; krilliäyriäiset)
         `-- Decapoda Latreille, 1802 (ten-legged crabs; kymmenjalkaiset)

After Parker, 1982, and Maddison & Maddison, 1995-1998 ["The Tree of Life"]

<==o Malacostraca
   |--o Phyllocarida
   |  `-- Leptostraca
   `--o Eumalacostraca
      |-- Syncarida
      |--o Hoplocarida
      |  `-- Stomatopoda
      |-- Eucarida
      `-- Peracarida

After Meland & Willassen, 2007

<==o Malacostraca
   |-- Leptostraca
   |--+-- Mysida [paraphyletic Peracarida]
   |  `--+-- Euphausiacea [paraphyletic Eucarida]
   |     `-- Stomatopoda
   `--+--+-- Syncarida
      |  `--o Eucarida s.s.? [Decapoda in partim 1]
      |     |-- Amphionides
      |     `--+-- Palinura
      |        `--+-- Brachyura
      |           `--+-- Anomura
      |              `-- Astacidea
      `--+-- Caridea [Decapoda in partim 2]
         `--o Peracarida s.s.?
            |--+-- Thermosbaenacea
            |  `--+-- Lophogastrida
            |     `--+-- Spelaeogriphacea
            |        `-- Amphipoda
            `--+--+-- Mictacea
               |  `-- Stygiomysida
               `--+-- Tanaidacea
                  `--+-- Cumacea
                     `-- Isopoda

Reference(s):

Reference(s):