1. Subfamily Boreomysinae Holt & Tattersall, 1905
   1. Genus Aviamysis San Vicente & Cartanyà, 2017 †
   2. Genus Boreomysis G.O. Sars, 1869
   3. Genus Neobirsteiniamysis Hendrickx & Tchindonova, 2020
   4. Genus Birsteiniamysis Tchindonova, 1981 accepted as Neobirsteiniamysis Hendrickx & Tchindonova, 2020 (nomen nudum)
2. Subfamily Erythropinae Hansen, 1910
   1. Tribe Amblyopsini Tchindonova, 1981
      1. Genus Amblyops G.O. Sars, 1872
      2. Genus Amblyopsoides O.S. Tattersall, 1955
      3. Genus Amphiakrops Wittmann, 2024
      4. Genus Chelamblyops Wittmann, 2024
      5. Genus Desmocornea Wittmann, 2024
      6. Genus Eoamblyops Murano, 2013
      7. Genus Paramblyops Holt & Tattersall, 1905
      8. Genus Schizurakrops Wittmann, 2024
      9. Genus Scolamblyops Murano, 1974
      10. Genus Stellamblyops Petryashov & Frutos, 2017
      11. Genus Teratamblyops Murano, 2001
   2. Tribe Arachnomysini Holt & Tattersall, 1905
      1. Genus Arachnomysis Chun, 1887
      2. Genus Caesaromysis Ortmann, 1893
      3. Genus Chunomysis Holt & Tattersall, 1905
      4. Genus Gymnerythrops Hansen, 1910
   3. Tribe Calyptommini W.M. Tattersall, 1909
      1. Genus Abyssomysis Wittmann, 2020
      2. Genus Calyptomma W. Tattersall, 1909
      3. Genus Michthyops Tattersall, 1911
   4. Tribe Erythropini Hansen, 1910
      1. Genus Aberomysis Bacescu & Iliffe, 1986
      2. Genus Amathimysis Brattegard, 1969
      3. Genus Atlanterythrops Nouvel & Lagardère, 1976
      4. Genus Australerythrops W. Tattersall, 1928
      5. Genus Dactylamblyops Holt & Tattersall, 1906
      6. Genus Dactylerythrops Holt & Tattersall, 1905
      7. Genus Echinomysides Murano, 1977
      8. Genus Echinomysis Illig, 1905
      9. Genus Erythrops G.O. Sars, 1869
      10. Genus Euchaetomera G.O. Sars, 1883
      11. Genus Euchaetomeropsis W. Tattersall, 1909
      12. Genus Gibbamblyops Murano & Krygier, 1985
      13. Genus Gibberythrops Illig, 1930
      14. Genus Heteroerythrops O. Tattersall, 1955
      15. Genus Holmesiella Ortmann, 1908
      16. Genus Hyperamblyops Birstein & Tchindonova, 1958
      17. Genus Hypererythrops Holt & Tattersall, 1905
      18. Genus Illigiella Murano, 1981
      19. Genus Indoerythrops Panampunnayil, 1998
      20. Genus Katerythrops Holt & Tattersall, 1905
      21. Genus Liuimysis Wang, 1998
      22. Genus Longithorax Illig, 1906
      23. Genus Meierythrops Murano, 1981
      24. Genus Metamblyops W. Tattersall, 1907
      25. Genus Meterythrops S.I. Smith, 1879
      26. Genus Nakazawaia Murano, 1981
      27. Genus Nipponerythrops Murano, 1977
      28. Genus Parerythrops G.O. Sars, 1869
      29. Genus Pleurerythrops Ii, 1964
      30. Genus Pseudamblyops Ii, 1964
      31. Genus Pseuderythrops Coifmann, 1936
      32. Genus Pteromysis Ii, 1964
      33. Genus Shenimysis Wang, 1998
      34. Genus Synerythrops Hansen, 1910
      35. Genus Teraterythrops Ii, 1964
   5. Tribe Inusitatomysini Wittmann, Ariani & Lagardère, 2014
      1. Genus Inusitatomysis Ii, 1940
   6. Tribe Mysimenziesini Tchindonova, 1981
      1. Genus Marumomysis Murano, 1999
      2. Genus Mysimenzies Bacescu, 1971
   7. Tribe Pseudommini Wittmann, Ariani & Lagardère, 2014
      1. Genus Neoamblyops Fukuoka, 2009
      2. Genus Parapseudomma Nouvel & Lagardère, 1976
      3. Genus Pseudomma G.O. Sars, 1870
   8. Tribe Thalassomysini Nouvel, 1942
      1. Genus Thalassomysis W.M. Tattersall, 1939
   9. Genus Xenomysis Kou, Meland & Li, 2020
   10. Genus Amblyopsis G.O. Sars, 1869 accepted as Amblyops G.O. Sars, 1872
   11. Genus Brutomysis Chun, 1896 accepted as Euchaetomera G.O. Sars, 1883 (synonym)
   12. Genus Caesaromysides Colosi, 1916 accepted as Caesaromysis Ortmann, 1893
   13. Genus Chalcophthalmus Illig, 1906 accepted as Dactylamblyops Holt & Tattersall, 1906
   14. Genus Eoerythrops Murano, 1969 accepted as Gibberythrops Illig, 1930
   15. Genus Holmsiella Ortmann, 1908 accepted as Holmesiella Ortmann, 1908 (unaccepted > misspelling - incorrect subsequent spelling, spelling mistake)
   16. Genus Mastigophthalmus Illig, 1906 accepted as Euchaetomera G.O. Sars, 1883
   17. Genus Mychthyops Tattersall, 1911 accepted as Michthyops Tattersall, 1911 (spelling mistake)
   18. Genus Nakazawai Murano, 1981 accepted as Nakazawaia Murano, 1981 (spelling mistake)
   19. Genus Nematopus G.O. Sars, 1863 accepted as Erythrops G.O. Sars, 1869
   20. Genus Siriellerythrops Ledoyer, 1970 accepted as Siriella Dana, 1850
   21. Genus Xenerythrops Ii, 1964 accepted as Longithorax Illig, 1906 (junior synonym)
3. Subfamily Gastrosaccinae Norman, 1892
   1. Tribe Anchialinini Wittmann, Ariani & Lagardère, 2014
      1. Genus Anchialina Norman & Scott, 1906
      2. Genus Paranchialina Hansen, 1910
      3. Genus Pseudanchialina Hansen, 1910
   2. Tribe Archaeomysini Czerniavsky, 1882
      1. Genus Archaeomysis Czerniavsky, 1882
   3. Tribe Gastrosaccini Norman, 1892
      1. Genus Chlamydopleon Ortmann, 1893
      2. Genus Coifmanniella Heard & Price, 2006
      3. Genus Eurobowmaniella Murano, 1995
      4. Genus Gastrosaccus Norman, 1868
      5. Genus Haplostylus Kossmann, 1880
      6. Genus Iiella Bacescu, 1968
   4. Genus Acanthocaris Sim, 1872 accepted as Gastrosaccus Norman, 1868
   5. Genus Anchialus Krøyer, 1861 accepted as Anchialina Norman & Scott, 1906 (unaccepted > junior homonym, non Anchialus Thompson, 1859 (Coleoptera))
   6. Genus Anchiolus accepted as Anchialina Norman & Scott, 1906 (Misspelling)
   7. Genus Bowmaniella Bacescu, 1968 (unaccepted > nomen nudum, partim Bowmaniella Heard & Price, 2006; partim Coifmanniella Heard & Price, 2006)
   8. Genus Bowmaniella Heard & Price, 2006 accepted as Chlamydopleon Ortmann, 1893 (junior synonym)
   9. Genus Callomysis Holmes, 1894 accepted as Archaeomysis Czerniavsky, 1882
   10. Genus Pseudoanchialina Hansen, 1910 accepted as Pseudanchialina Hansen, 1910 (unaccepted > misspelling - incorrect subsequent spelling)
   11. Genus Coifmanniella Bacescu, 1968 represented as Bowmaniella (Coifmanniella) Bacescu, 1968 accepted as Coifmanniella Heard & Price, 2006
4. Subfamily Heteromysinae Norman, 1892
   1. Genus Corellamysis San Vicente & Monniot, 2014
   2. Tribe Harmelinellini Wittmann, Ariani & Lagardère, 2014
      1. Genus Harmelinella Ledoyer, 1989
   3. Tribe Heteromysini Norman, 1892
      1. Genus Heteromysis S.I. Smith, 1873
      2. Genus Heteromysoides Bacescu, 1968
      3. Genus Ischiomysis Wittmann, 2013
      4. Genus Platymysis Brattegard, 1980
      5. Genus Platyops Bacescu & Iliffe, 1986
      6. Genus Retromysis Wittmann, 2004
   4. Tribe Mysidetini Holt & Tattersall, 1906
      1. Genus Bermudamysis Bacescu & Iliffe, 1986
      2. Genus Burrimysis Jaume & Garcia, 1993
      3. Genus Deltamysis Bowman & Orsi, 1992
      4. Genus Kochimysis Panampunnayil & Biju, 2007
      5. Genus Mysidetes Holt & Tattersall, 1906
      6. Genus Mysifaun Wittmann, 1996
      7. Genus Pseudomysidetes W. Tattersall, 1936
   5. Genus Chiromysis G.O. Sars, 1877 accepted as Heteromysis S.I. Smith, 1873
   6. Genus Gnathomysis Bonnier & Perez, 1902 accepted as Heteromysis (Gnathomysis) Bonnier & Perez, 1902
   7. Genus Neoheteromysis Bacescu, 1976 accepted as Heteromysis (Neoheteromysis) Bacescu, 1976
5. Subfamily Leptomysinae Czerniavsky, 1882
   1. Tribe Afromysini Wittmann, Ariani & Lagardère, 2014
      1. Genus Afromysis Zimmer, 1916
      2. Genus Australomysis W. Tattersall, 1927
      3. Genus Bathymysis W. Tattersall, 1907
      4. Genus Ceratodoxomysis Murano, 2003
      5. Genus Dioptromysis Zimmer, 1915
      6. Genus Doxomysis Hansen, 1912
      7. Genus Hyperiimysis Nouvel, 1966
      8. Genus Iimysis Nouvel, 1966
      9. Genus Mysideis G.O. Sars, 1869
      10. Genus Neobathymysis Bravo & Murano, 1996
      11. Genus Neodoxomysis Murano, 1999
      12. Genus Nouvelia Bacescu & Vasilescu, 1973
      13. Genus Prionomysis W. Tattersall, 1922
      14. Genus Promysis Dana, 1850
      15. Genus Pseudobranchiomysis Carcedo, Fiori & Hoffmeyer, 2013
      16. Genus Pseudomysis G. O. Sars, 1879
      17. Genus Pseudoxomysis Nouvel, 1973
      18. Genus Rostromysis Panampunnayil, 1987
      19. Genus Tenagomysis Thomson, 1900
   2. Tribe Leptomysini Czerniavsky, 1882
      1. Genus Antichthomysis Fenton, 1991
      2. Genus Leptomysis G.O. Sars, 1869
      3. Genus Megalopsis Panampunnayil, 1987
      4. Genus Notomysis Wittmann, 1986
      5. Genus Paraleptomysis Liu & Wang, 1983
      6. Genus Pyroleptomysis Wittmann, 1985
   3. Tribe Mysidopsini Wittmann, Ariani & Lagardère, 2014
      1. Genus Americamysis Price, Heard & Stuck, 1994
      2. Genus Brasilomysis Bacescu, 1968
      3. Genus Cubanomysis Bacescu, 1968
      4. Genus Metamysidopsis W.M. Tattersall, 1951
      5. Genus Mysidopsis G.O. Sars, 1864
   4. Genus Leptocaris Aurivillius, 1898 accepted as Mesopodopsis Czerniavsky, 1882
   5. Genus Nysidopsis G.O. Sars, 1864 accepted as Mysidopsis G.O. Sars, 1864 (spelling mistake)
   6. Genus Paramysidopsis Zimmer, 1912 accepted as Mysidopsis G.O. Sars, 1864
   7. Genus Proleptomysis Wittmann, 1985 accepted as Pyroleptomysis Wittmann, 1985 (misspelling of Pyroleptomysis Wittmann, 1985)
   8. Genus Thenagomysis Thomson, 1900 accepted as Tenagomysis Thomson, 1900 (spelling variation)
   9. Genus Uromysis Hansen, 1910 accepted as Promysis Dana, 1850 (unaccepted > junior subjective synonym)
6. Subfamily Mysidellinae Czerniavsky, 1882
   1. Genus Muscamysis Kou, Meland & Li, 2024
   2. Genus Mysidella G.O. Sars, 1872
   3. Genus Metamysidella Illig, 1906 accepted as Mysidetes Holt & Tattersall, 1906
7. Subfamily Mysinae Haworth, 1825
   1. Tribe Anisomysini Wittmann, Ariani & Lagardère, 2014
      1. Genus Anisomysis Hansen, 1910
      2. Genus Halemysis Bacescu & Udrescu, 1984
      3. Genus Idiomysis W. Tattersall, 1922
      4. Genus Mysidium Dana, 1852
      5. Genus Paramesopodopsis Fenton, 1985
      6. Genus Mysidia Dana, 1850 accepted as Mysidium Dana, 1852 (Junior homonym)
   2. Tribe Diamysini Wittmann, Ariani & Lagardère, 2014
      1. Genus Antromysis Creaser, 1936
      2. Genus Diamysis Czerniavsky, 1882
      3. Genus Gangemysis Derzhavin, 1924
      4. Genus Indomysis W. Tattersall, 1914
      5. Genus Limnomysis Czerniavsky, 1882
      6. Genus Parvimysis Brattegard, 1969
      7. Genus Surinamysis Bowman, 1977
      8. Genus Taphromysis Banner, 1953
      9. Genus Troglomysis Stammer, 1933
   3. Tribe Hemimysini Czerniavsky, 1882
      1. Genus Hemimysis G.O. Sars, 1869
   4. Tribe Mysini Haworth, 1825
      1. Genus Antarctomysis Coutière, 1906
      2. Genus Arthromysis Colosi, 1924
      3. Genus Hyperstilomysis Fukuoka, Bravo & Murano, 2005
      4. Genus Kainommatomysis W. Tattersall, 1927
      5. Genus Mesopodopsis Czerniavsky, 1882
      6. Genus Mysis Latreille, 1802
      7. Genus Nanomysis W. Tattersall, 1921
      8. Genus Parastilomysis Ii, 1936
      9. Genus Stilomysis Norman, 1892
      10. Genus Tasmanomysis Fenton, 1985
   5. Tribe Neomysini Wittmann, Ariani & Lagardère, 2014
      1. Genus Acanthomysis Czerniavsky, 1882
      2. Genus Alienacanthomysis Holmquist, 1981
      3. Genus Boreoacanthomysis Fukuoka & Murano, 2004
      4. Genus Columbiaemysis Holmquist, 1982
      5. Genus Disacanthomysis Holmquist, 1981
      6. Genus Exacanthomysis Holmquist, 1981
      7. Genus Hemiacanthomysis Fukuoka & Murano, 2002
      8. Genus Hippacanthomysis Murano & Chess, 1987
      9. Genus Holmesimysis Holmquist, 1979
      10. Genus Hyperacanthomysis Fukuoka & Murano, 2000
      11. Genus Lycomysis Hansen, 1910
      12. Genus Mesacanthomysis Nouvel, 1967
      13. Genus Neomysis Czerniavsky, 1882
      14. Genus Nipponomysis Takahashi & Murano, 1986
      15. Genus Notacanthomysis Fukuoka & Murano, 2000
      16. Genus Orientomysis Derzhavin, 1913
      17. Genus Pacifacanthomysis Holmquist, 1981
      18. Genus Paracanthomysis Ii, 1936
      19. Genus Proneomysis W. Tattersall, 1933
      20. Genus Telacanthomysis Fukuoka & Murano, 2001
      21. Genus Xenacanthomysis Holmquist, 1980
   6. Tribe Paramysini Wittmann, Ariani & Daneliya, 2016
      1. Genus Caspiomysis G.O. Sars, 1907
      2. Genus Katamysis G.O. Sars, 1893
      3. Genus Paramysis Czerniavsky, 1882
      4. Genus Praunus Leach, 1814
      5. Genus Sarmysis Maissuradze & Popescu, 1987 †
      6. Genus Schistomysis Norman, 1892
   7. Tribe Aberomysini Bacescu & Iliffe, 1986 accepted as Erythropinae Hansen, 1910
   8. Genus Arctomysis Hansen, 1887 accepted as Hansenomysis Stebbing, 1893
   9. Genus Austromysis Czerniavsky, 1882 accepted as Paramysis Czerniavsky, 1882
   10. Genus Carnegieomysis W. Tattersall, 1943 accepted as Anisomysis (Carnegieomysis) W. Tattersall, 1943
   11. Genus Cryptomysis Hansen, 1912 accepted as Anisomysis Hansen, 1910
   12. Genus Dasymysis Holt & Beaumont, 1900 accepted as Acanthomysis Czerniavsky, 1882 (junior synonym)
   13. Genus Euxinomysis Czerniavsky, 1882 accepted as Diamysis Czerniavsky, 1882 (synonym)
   14. Genus Inusitatiomysis Ii, 1940 accepted as Inusitatomysis Ii, 1940 (unaccepted > misspelling - incorrect subsequent spelling)
   15. Genus Javanisomysis Bacescu, 1992 accepted as Anisomysis (Javanisomysis) Bacescu, 1992
   16. Genus Kainomatomysis W. Tattersall, 1927 accepted as Kainommatomysis W. Tattersall, 1927 (spelling variation)
   17. Genus Kesslerella Czerniavsky, 1882 accepted as Praunus Leach, 1814 (unaccepted > junior subjective synonym)
   18. Genus Kreagromysis Illig, 1930 accepted as Anisomysis Hansen, 1910
   19. Genus Macromysis White, 1847 accepted as Praunus Leach, 1814 (junior synonym)
   20. Genus Macropsis G.O. Sars, 1877 accepted as Mesopodopsis Czerniavsky, 1882
   21. Tribe Mancomysini Bacescu & Iliffe, 1986 accepted as Mancomysinae Bacescu & Iliffe, 1986 accepted as Palaumysinae Wittmann, 2013
   22. Genus Megalophthalmus Leach, 1830 accepted as Mysis Latreille, 1802
   23. Genus Mesomysis Czerniavsky, 1882 accepted as Paramysis (Mesomysis) Czerniavsky, 1882 (unaccepted > superseded rank)
   24. Genus Mesomysis Norman, 1905 accepted as Michtheimysis Norman, 1902 accepted as Mysis Latreille, 1802 (unaccepted > junior homonym, not Mesomysis Czerniavsky, 1882)
   25. Genus Metamysis G.O. Sars, 1895 accepted as Paramysis (Metamysis) G.O. Sars, 1895
   26. Genus Metamysis Nakazawa, 1910 accepted as Orientomysis Derzhavin, 1913 (unaccepted > junior homonym, non Metamysis G.O. Sars, 1895)
   27. Genus Michtheimysis Norman, 1902 accepted as Mysis Latreille, 1802 (unaccepted > junior subjective synonym, returned to synonymy)
   28. Genus Onychomysis Czerniavsky, 1882 accepted as Limnomysis Czerniavsky, 1882 (unaccepted > junior subjective synonym)
   29. Genus Podopsis J.V. Thompson, 1828 accepted as Mesopodopsis Czerniavsky, 1882
   30. Genus Pontomysis Czerniavsky, 1882 accepted as Gastrosaccus Norman, 1868
   31. Genus Potamomysis Czerniavsky, 1882 accepted as Diamysis Czerniavsky, 1882 (synonym)
   32. Genus Pseudoparamysis Bacescu, 1940 accepted as Paramysis (Pseudoparamysis) Bacescu, 1940
   33. Genus Pugetomysis Banner, 1948 accepted as Mysis Latreille, 1802
   34. Genus Synmysis Czerniavsky, 1882 (accepted as Praunus and Schistomysis)
   35. Genus Themisto Goodsir, 1842 accepted as Siriella Dana, 1850 (unaccepted > junior homonym, of Themisto Guérin, 1825 (Amphipoda))
8. Subfamily Palaumysinae Wittmann, 2013
   1. Genus Gironomysis Ortiz, García-Debrás & Pérez, 1997
   2. Genus Palaumysis Bacescu & Iliffe, 1986
9. Subfamily Rhopalophthalminae Hansen, 1910
   1. Genus Rhopalophthalmus Illig, 1906
10. Subfamily Siriellinae Czerniavsky, 1882
    1. Tribe Metasiriellini Murano, 1986
       1. Genus Metasiriella Murano, 1986
    2. Tribe Siriellini Czerniavsky, 1882
       1. Genus Hemisiriella Hansen, 1910
       2. Genus Siriella Dana, 1850
       3. Genus Cynthia Thompson, 1829 accepted as Cynthilia White, 1850 accepted as Siriella Dana, 1850 (unaccepted > junior homonym, of Cynthia Fabricius, 1807 (Lepidoptera))
       4. Genus Cynthilia White, 1850 accepted as Siriella Dana, 1850
       5. Genus Heterosiriella Czerniavsky, 1882 accepted as Siriella Dana, 1850 (unaccepted > junior subjective synonym)
       6. Genus Pseudosiriella Claus, 1884 accepted as Siriella Dana, 1850 (unaccepted > junior subjective synonym)
11. Subfamily Mancomysinae Bacescu & Iliffe, 1986 accepted as Palaumysinae Wittmann, 2013
12. Subfamily Pseudanchialinae accepted as Boreomysinae Holt & Tattersall, 1905
    1. Genus Pseudanchialus Caullery, 1896 accepted as Boreomysis G.O. Sars, 1869

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