Between brackets is the number of accepted extant species
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- Decapoda (17 690)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 157)
- Infraorder Achelata (153)
- Infraorder Anomura (3 417)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 885)
- 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 †
- Genus Acanthinopus Pinna, 1974 †
- Species Acanthinopus gibbosus Pinna, 1974 †
- Genus Alcmonacaris Polz, 2008 †
- Genus Amphiplectus Spence Bate, 1888
- Genus Bannikovia Garassino & Teruzzi, 1996 † accepted as Crangon Fabricius, 1798
- Genus Bavaricaris Winkler, 2021 †
- Genus Blaculla Münster, 1839 †
- Genus Bombur Münster, 1839 † accepted as Hefriga Münster, 1839 †
- Genus Buergerocaris Schweigert & Garassino, 2004 †
- Genus Camptocaris Ortmann, 1893
- Genus Caulurus Stimpson, 1860
- Genus Copiocaris Thiele, 1905
- Genus Coronocaris Ortmann, 1893
- Genus Ctenodusa Schweigert, Garassino & Pasini, 2016 †
- Genus Euryurus von der Marck, 1863 † accepted as Gampsurus von der Marck in von der Marck & Schlüter, 1868 †
- Genus Falcicaris Ortmann, 1893
- Genus Gampsurus von der Marck in von der Marck & Schlüter, 1868 †
- Genus Hefriga Münster, 1839 †
- Genus Leiothorax Pinna, 1974 †
- Genus Oligocaris Ortmann, 1893
- Genus Pandacaricyphus Coutière, 1907
- Genus Parvocaris Bravi & Garassino, 1998 †
- Genus Pinnacaris Garassino & Teruzzi, 1993 †
- Genus Posydon Fabricius, 1798
- Genus Schernfeldia Winkler, 2013 †
- Genus Solteria Garassino, Pasini, Guisberti & Calzoni, 2024 †
- Genus Venzia Garassino, Pasini, Guisberti & Calzoni, 2024 †
- Superfamily Crangonoidea Haworth, 1825 (329)
- 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 (101)
- Suborder Reptantia
- Suborder Trichelida