Between brackets is the number of accepted extant species
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- Decapoda (17 688)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 155)
- Infraorder Achelata (153)
- Infraorder Anomura (3 416)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 884)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 920)
- Section Amphionidea accepted as Caridea
- Section Penaeidea accepted as Dendrobranchiata
- Superfamily Alpheoidea Rafinesque, 1815 (1 230)
- Superfamily Atyoidea De Haan, 1849 (560)
- Superfamily Bresilioidea Calman, 1896 (70)
- Superfamily Campylonotoidea Sollaud, 1913 (17)
- Superfamily Caridea incertae sedis †
- Superfamily Crangonoidea Haworth, 1825 (329)
- Superfamily Nematocarcinoidea Smith, 1884 (80)
- Superfamily Oplophoroidea Dana, 1852 (71)
- Family Acanthephyridae Spence Bate, 1888 (55)
- Genus Acanthephyra A. Milne-Edwards, 1881 (26)
- Subgenus Acanthephyra (Meningodora) Smith, 1882 accepted as Meningodora Smith, 1882
- Species Acanthephyra abyssorum Filhol, 1885 accepted as Acanthephyra purpurea A. Milne-Edwards, 1881
- Species Acanthephyra acanthitelsonis Spence Bate, 1888 accepted as Acanthephyra pelagica (Risso, 1816)
- Species Acanthephyra acutifrons Spence Bate, 1888
- Species Acanthephyra affinis Faxon, 1896 accepted as Systellaspis pellucida (Filhol, 1884)
- Species Acanthephyra agassizzi Smith, 1884 accepted as Acanthephyra pelagica (Risso, 1816)
- Species Acanthephyra angusta Spence Bate, 1888 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra anomala Boone, 1927 accepted as Janicella spinicauda (A. Milne-Edwards, 1883)
- Species Acanthephyra antarctica Bage, 1938 accepted as Nematocarcinus lanceopes Spence Bate, 1888
- Species Acanthephyra approxima Spence Bate, 1888 accepted as Acanthephyra carinata Spence Bate, 1888
- Species Acanthephyra armata A. Milne-Edwards, 1881
- Variety Acanthephyra armata var. fimbriata Alcock & Anderson, 1894 accepted as Acanthephyra fimbriata Alcock & Anderson, 1894
- Species Acanthephyra batei Stebbing, 1905 accepted as Acanthephyra quadrispinosa Kemp, 1939
- Species Acanthephyra batei Faxon, 1895 accepted as Meningodora vesca (Smith, 1886)
- Species Acanthephyra brachytelsonis Spence Bate, 1888 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra braueri Balss, 1914 accepted as Bralaspis braueri (Balss, 1914)
- Species Acanthephyra brevicarinata Hanamura, 1984
- Species Acanthephyra brevirostris Smith, 1885
- Species Acanthephyra brevirostris Spence Bate, 1888 accepted as Meningodora vesca (Smith, 1886)
- Species Acanthephyra carinata Spence Bate, 1888
- Species Acanthephyra chacei Krygier & Forss, 1981
- Species Acanthephyra cristata Faxon, 1893 accepted as Cristaspis cristata (Faxon, 1893)
- Species Acanthephyra cucullata Faxon, 1893
- Species Acanthephyra curtirostris Wood-Mason in Wood-Mason & Alcock, 1891
- Species Acanthephyra debilis A. Milne-Edwards, 1881 accepted as Debaspis debilis (A. Milne-Edwards, 1881)
- Species Acanthephyra edwardsii Spence Bate, 1888 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra ensis A. Milne-Edwards, 1881 accepted as Plesionika ensis (A. Milne-Edwards, 1881)
- Species Acanthephyra eximea Smith, 1884 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra eximia Smith, 1884
- Species Acanthephyra faxoni Calman, 1939
- Species Acanthephyra fimbriata Alcock & Anderson, 1894
- Species Acanthephyra frontieri Crosnier, 1988 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra gracilipes Chace, 1940 accepted as Acanthephyra tenuipes (Spence Bate, 1888)
- Species Acanthephyra heatheri Vereshchaka, Kulagin & Lunina, 2022
- Species Acanthephyra indica Balss, 1925
- Species Acanthephyra kempii Balss, 1914 accepted as Acanthephyra sanguinea Wood-Mason in Wood-Mason & Alcock, 1892
- Species Acanthephyra kingsleyi Spence Bate, 1888
- Species Acanthephyra longidens Spence Bate, 1888 accepted as Heterogenys microphthalma (Smith, 1885)
- Species Acanthephyra media Spence Bate, 1888
- Species Acanthephyra microphthalma Smith, 1885 accepted as Heterogenys microphthalma (Smith, 1885)
- Species Acanthephyra parva Coutière, 1905
- Species Acanthephyra parvirostris Coutière, 1911 accepted as Meningodora vesca (Smith, 1886)
- Species Acanthephyra pelagica (Risso, 1816)
- Species Acanthephyra pellucida Filhol, 1884 accepted as Systellaspis pellucida (Filhol, 1884)
- Species Acanthephyra pleuracantha Coutière, 1914
- Species Acanthephyra prionota Foxton, 1971
- Species Acanthephyra pulchra A. Milne-Edwards, 1890 accepted as Acanthephyra eximia Smith, 1884
- Species Acanthephyra purpurea A. Milne-Edwards, 1881
- Species Acanthephyra quadrispinosa Kemp, 1939
- Species Acanthephyra rectirostris Riggio, 1900 accepted as Acanthephyra pelagica (Risso, 1816)
- Species Acanthephyra rostrata (Spence Bate, 1888)
- Species Acanthephyra sanguinea Wood-Mason in Wood-Mason & Alcock, 1892
- Species Acanthephyra sexspinosa Kemp, 1939 accepted as Acanthephyra kingsleyi Spence Bate, 1888
- Species Acanthephyra sibogae De Man, 1916
- Species Acanthephyra sica Spence Bate, 1888 accepted as Acanthephyra pelagica (Risso, 1816)
- Species Acanthephyra smithi Kemp, 1939
- Species Acanthephyra stylorostratis (Spence Bate, 1888)
- Species Acanthephyra stylorostratus (Spence Bate, 1888) accepted as Acanthephyra stylorostratis (Spence Bate, 1888)
- Species Acanthephyra tenuipes (Spence Bate, 1888)
- Species Acanthephyra trispinosa Kemp, 1939
- Species Acanthephyra valdiviae Balss, 1914 accepted as Kemphyra corallina (A. Milne-Edwards, 1883)
- Genus Acanthephyropsis Riggio, 1895 accepted as Acanthephyra A. Milne-Edwards, 1881
- Genus Bentheocaris Spence Bate, 1888 accepted as Acanthephyra A. Milne-Edwards, 1881
- Genus Calymarina Spence Bate, 1888
- Genus Ephyra Roux, 1831 accepted as Acanthephyra A. Milne-Edwards, 1881
- Genus Ephyrina Smith, 1885 (6)
- Genus Heterogenys Chace, 1986 (2)
- Genus Hoplocaricyphus Coutière, 1907 accepted as Acanthephyra A. Milne-Edwards, 1881
- Genus Hymenodora G.O. Sars, 1877 (5)
- Genus Kemphyra Chace, 1986 (1)
- Genus Meningodora Smith, 1882 (6)
- Genus Miersia Kingsley, 1880 accepted as Acanthephyra A. Milne-Edwards, 1881
- Genus Notostomus A. Milne-Edwards, 1881 (9)
- Genus Sclerodora Vereshchaka, Kulagin & Lunina, 2021
- Genus Tropiocaris Spence Bate, 1888 accepted as Ephyrina Smith, 1885
- Genus Tropirinus Spence Bate, 1888 accepted as Ephyrina Smith, 1885
- Family Hymenodoridae Lunina, Kulagin & Vereshchaka, 2023 accepted as Acanthephyridae Spence Bate, 1888
- Family Oplophoridae Dana, 1852 (16)
- Superfamily Palaemonoidea Rafinesque, 1815 (1 149)
- Superfamily Pandaloidea Haworth, 1825 (203)
- Superfamily Pasiphaeoidea Dana, 1852 (104)
- Superfamily Physetocaridoidea Chace, 1940 accepted as Pandaloidea Haworth, 1825
- Superfamily Pleopteryxoidea Schweigert & Garassino, 2006 †
- Superfamily Processoidea Ortmann, 1896 (70)
- Superfamily Psalidopodoidea Wood-Mason (3)
- Superfamily Stylodactyloidea Spence Bate, 1888 (34)
- Family Hectarthropidae Spence Bate, 1888 accepted as Processidae Ortmann, 1896
- Family Prionorhynchus Leach, 1830
- Genus Caricyphus Spence Bate, 1888
- Genus Rhomaleocaris Spence Bate, 1888
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (101)
- Suborder Reptantia
- Suborder Trichelida