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)
- Section Callichimaeroida †
- Section Cyclodorippoida (110)
- Section Dakoticancroida †
- Section Dromiacea (189)
- Section Etyoida †
- Section Eubrachyura (7 446)
- Subsection Heterotremata (6 086)
- Subsection Thoracotremata (1 360)
- Superfamily Aphanodactyloidea Ahyong & Ng, 2009 (16)
- Superfamily Cryptochiroidea Paulson, 1875 (56)
- Family Cryptochiridae Paulson, 1875 (56)
- Genus Cecidocarcinus Kropp & Manning, 1987 (2)
- Species Cecidocarcinus brychius Kropp & Manning, 1987
- Species Cecidocarcinus zibrowii Manning, 1991
- Genus Cryptochirus Heller, 1860 (2)
- Genus Dacryomaia Kropp, 1990 (2)
- Genus Detocarcinus Kropp & Manning, 1987 (1)
- Genus Favicola Serène, 1968 accepted as Cryptochirus Heller, 1860
- Genus Fizesereneia Takeda & Tamura, 1980 (7)
- Genus Fungicola Serène, 1968 (3)
- Genus Hapalocarcinus Stimpson, 1859 (1)
- Genus Hiroia Takeda & Tamura, 1981 (1)
- Genus Kroppcarcinus Badaro, Neves, Castro & Johnsson, 2012 (1)
- Genus Lithoscaptus A. Milne-Edwards, 1862 (13)
- Genus Luciades Kropp & Manning, 1996 (1)
- Genus Neotroglocarcinus Takeda & Tamura, 1980 (2)
- Genus Neotroglocarcinus Fize & Serène, 1957 accepted as Neotroglocarcinus Takeda & Tamura, 1980
- Genus Opecarcinus Kropp & Manning, 1987 (10)
- Genus Pelycomaia Kropp, 1990 (1)
- Genus Pseudocryptochirus Hiro, 1938 (1)
- Genus Pseudohapalocarcinus Fize & Serène, 1956 (1)
- Genus Sphenomaia Kropp, 1990 (1)
- Genus Troglocarcinus Verrill, 1908 (1)
- Genus Utinomia Takeda & Tamura, 1981 accepted as Utinomiella Kropp & Takeda, 1988
- Genus Utinomiella Kropp & Takeda, 1988 (1)
- Genus Xynomaia Kropp, 1990 (3)
- Genus Zibrovia Kropp & Manning, 1996 (1)
- Family Cryptochirinae Paulson, 1875 accepted as Cryptochiridae Paulson, 1875
- Family Hapalocarcinidae Calman, 1900 accepted as Cryptochiridae Paulson, 1875
- Family Lithoscaptes A. Milne-Edwards, 1862 accepted as Cryptochiridae Paulson, 1875
- Superfamily Grapsoidea MacLeay, 1838 (645)
- Superfamily Ocypodoidea Rafinesque, 1815 (332)
- Superfamily Pinnotheroidea De Haan, 1833 (311)
- Section Homoloida (91)
- Section Podotremata accepted as Brachyura
- Section Raninoida (47)
- Section Torynommoida †
- Family Brachyura incertae sedis
- Family Cretapsaridae Luque in Luque, Xing, Briggs, Clark, Duque, Hui, Mai & McKellar, 2021 †
- Family Montemagrechiridae Klompmaker, Portell & van der Meij, 2016 †
- Genus Psammograpsus A. Milne-Edwards, 1860 †
- Genus Zoea Bosc, 1801
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida