Between brackets is the number of accepted extant species
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- Decapoda (17 683)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 150)
- Infraorder Achelata (153)
- Infraorder Anomura (3 414)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 883)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Section Amphionidea accepted as Caridea
- Section Penaeidea accepted as Dendrobranchiata
- Superfamily Alpheoidea Rafinesque, 1815 (1 229)
- 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)
- Family Crangonidae Haworth, 1825 (235)
- Subfamily Lysmatinae Dana, 1852 accepted as Lysmatidae Dana, 1852
- Genus Aegaeon Agassiz, 1846 (5)
- Genus Aegeon Agassiz, 1846 accepted as Aegaeon Agassiz, 1846
- Genus Argis Krøyer, 1843 (10)
- Genus Cheraphilus Kinahan, 1862 accepted as Pontophilus Leach, 1817
- Species Cheraphilus agassizii Smith, 1882 accepted as Metacrangon agassizii (Smith, 1882)
- Species Cheraphilus ferox G.O. Sars, 1877 accepted as Sclerocrangon ferox (G.O. Sars, 1877)
- Species Cheraphilus neglectus G.O. Sars, 1883 accepted as Philocheras bispinosus neglectus (G.O. Sars, 1883)
- Species Cheraphilus pattersonii Kinahan, 1860 accepted as Philocheras echinulatus (M. Sars, 1862)
- Genus Crago Lamarck, 1801 accepted as Crangon Fabricius, 1798
- Genus Crangon Fabricius, 1798 (19)
- Genus Crangonus Rafinesque, 1815 accepted as Crangon Fabricius, 1798
- Genus Egeon Bosc, 1813 accepted as Aegaeon Agassiz, 1846
- Genus Lissocrangon Kuris & Carlton, 1977 (1)
- Genus Lissosabinea Christoffersen, 1988 (9)
- Genus Mesapus Rafinesque, 1814 accepted as Philocheras Stebbing, 1900
- Genus Mesocrangon Zarenkov, 1965 (3)
- Genus Mesocrangon Zarenkov, 1964 accepted as Mesocrangon Zarenkov, 1965
- Genus Metacrangon Zarenkov, 1965 (46)
- Genus Metacrangon Zarenkov, 1964 accepted as Metacrangon Zarenkov, 1965
- Genus Miocrangon Garassino, Pasini & Nazarkin, 2021 †
- Genus Morscrangon Garassino & Jakobsen, 2005 †
- Genus Myto Krøyer, 1845 accepted as Sabinea Ross, 1835
- Genus Nectocrangon Brandt, 1851 accepted as Argis Krøyer, 1843
- Genus Nectrocrangon Brandt, 1850 † accepted as Argis Krøyer, 1843
- Genus Neocrangon Zarenkov, 1965 (6)
- Genus Neocrangon Zarenkov, 1964 accepted as Neocrangon Zarenkov, 1965
- Genus Notocrangon Coutière, 1900 (1)
- Genus Odontochelion Garassino, 1994 †
- Genus Paracrangon Dana, 1852 (7)
- Genus Parapontocaris Alcock, 1901 (6)
- Genus Parapontophilus Christoffersen, 1988 (19)
- Genus Philocheras Stebbing, 1900 (58)
- Genus Placopsicrangon Komai & Chan, 2009 (1)
- Genus Pontocaris Spence Bate, 1888 (10)
- Genus Pontocheras Bruce, 1988 accepted as Pontocaris Spence Bate, 1888
- Genus Pontophilus Leach, 1817 (3)
- Genus Prionocrangon Wood-Mason in Wood-Mason & Alcock, 1891 (9)
- Genus Pseudopontophilus Komai, 2004 (1)
- Genus Rhynocrangon Zarenkov, 1965 (3)
- Genus Rhynocrangon Zarenkov, 1964 accepted as Rhynocrangon Zarenkov, 1965
- Genus Sabinea Ross, 1835 (3)
- Genus Sclerocrangon G.O. Sars, 1883 (9)
- Genus Steiracrangon Kinahan, 1862 accepted as Crangon Fabricius, 1798
- Genus Syncrangon Kim & Hayashi, 2003 (2)
- Genus Vercoia Baker, 1904 (4)
- Family Glyphocrangonidae Smith, 1884 (94)
- Superfamily Nematocarcinoidea Smith, 1884 (80)
- Superfamily Oplophoroidea Dana, 1852 (71)
- 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 (100)
- Suborder Reptantia
- Suborder Trichelida