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)
- Superfamily Nematocarcinoidea Smith, 1884 (80)
- Superfamily Oplophoroidea Dana, 1852 (71)
- Family Acanthephyridae Spence Bate, 1888 (55)
- Family Hymenodoridae Lunina, Kulagin & Vereshchaka, 2023 accepted as Acanthephyridae Spence Bate, 1888
- Family Oplophoridae Dana, 1852 (16)
- Genus Bralaspis Vereshchaka, Kulagin, Lunina & Shatravin, 2025 (4)
- Genus Cristaspis Vereshchaka, Kulagin, Lunina & Shatravin, 2025 (2)
- Genus Debaspis Vereshchaka, Kulagin, Lunina & Shatravin, 2025 (2)
- Genus Hoplopasiphaea Yokoya & Shibata, 1965 accepted as Systellaspis Spence Bate, 1888
- Genus Hoplophorus H. Milne Edwards, 1837 accepted as Oplophorus H. Milne Edwards, 1837
- Genus Janicella Chace, 1986 (1)
- Genus Oplophorus H. Milne Edwards, 1837 (4)
- Genus Systellaspis Spence Bate, 1888 (3)
- Species Systellaspis affinis (Faxon, 1896) accepted as Systellaspis pellucida (Filhol, 1884)
- Species Systellaspis bouvieri Coutière, 1905 accepted as Systellaspis debilis (A. Milne-Edwards, 1881)
- Species Systellaspis braueri (Balss, 1914) accepted as Bralaspis braueri (Balss, 1914)
- Species Systellaspis cristata (Faxon, 1893) accepted as Cristaspis cristata (Faxon, 1893)
- Species Systellaspis curvispina Crosnier, 1988 accepted as Cristaspis curvispina (Crosnier, 1988)
- Species Systellaspis debilis (A. Milne-Edwards, 1881) accepted as Debaspis debilis (A. Milne-Edwards, 1881)
- Species Systellaspis densispina Stephensen, 1923 accepted as Systellaspis braueri braueri (Balss, 1914)
- Species Systellaspis echinurus Coutière, 1911 accepted as Systellaspis braueri braueri (Balss, 1914)
- Species Systellaspis eltanini Wasmer, 1986 accepted as Bralaspis eltanini (Wasmer, 1986)
- Species Systellaspis guillei Crosnier, 1988
- Species Systellaspis intermedia Crosnier, 1988 accepted as Bralaspis intermedia (Crosnier, 1988)
- Species Systellaspis lanceocaudata Spence Bate, 1888
- Species Systellaspis liui Sha & Wang, 2015 accepted as Debaspis liui (Sha & Wang, 2015)
- Species Systellaspis paucispinosa Crosnier, 1988 accepted as Bralaspis paucispinosa (Crosnier, 1988)
- Species Systellaspis pellucida (Filhol, 1884)
- Genus Tonellocaris Garassino, 1998 †
- 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