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)
- Section Thaumastochelida accepted as Nephropidae Dana, 1852
- Superfamily Astacidea incertae sedis †
- Superfamily Astacoidea Latreille, 1802 (495)
- Family Astacidae Latreille, 1802 (21)
- Family Austroastacidae Clark, 1936 accepted as Parastacidae Huxley, 1879
- Family Cambaridae Hobbs, 1942 (468)
- Subfamily Cambarellinae Laguarda, 1961 accepted as Cambaridae Hobbs, 1942
- Subfamily Cambarinae Hobbs, 1942 accepted as Cambaridae Hobbs, 1942
- Subfamily Cambaroidinae Villalobos, 1955 accepted as Astacidae Latreille, 1802
- Genus Barbicambarus Hobbs, 1969 (2)
- Genus Bouchardina Hobbs, 1977 (1)
- Genus Cambarellus Ortmann, 1905 (20)
- Genus Cambarus Erichson, 1846 (122)
- Genus Creaserinus Hobbs, 1973 (15)
- Species Creaserinus brevistylus Johnson, Stern & Crandall, 2021
- Species Creaserinus burrisi (Fitzpatrick, 1987)
- Species Creaserinus byersi (Hobbs, 1941)
- Species Creaserinus caesius (Hobbs, 1975)
- Species Creaserinus clausus Johnson, Stern & Crandall, 2021
- Species Creaserinus crenastylus Johnson, Stern & Crandall, 2021
- Species Creaserinus danielae (Hobbs, 1975)
- Species Creaserinus fodiens (Cottle, 1863)
- Species Creaserinus gilpini (Hobbs & Robison, 1989)
- Species Creaserinus gordoni (Fitzpatrick, 1987)
- Species Creaserinus hedgpethi (Hobbs, 1948)
- Species Creaserinus hortoni (Hobbs & Fitzpatrick, 1970)
- Species Creaserinus limulus Johnson, Stern & Crandall, 2021
- Species Creaserinus oryktes (Penn & Marlow, 1959)
- Species Creaserinus trinensis Johnson, Stern & Crandall, 2021
- Genus Distocambarus Hobbs, 1981 (5)
- Genus Fallicambarus Hobbs, 1969 (12)
- Genus Faxonella Creaser, 1933 (4)
- Genus Faxonius Ortmann, 1905 (91)
- Genus Hobbseus Fitzpatrick & Payne, 1968 (7)
- Genus Lacunicambarus Hobbs, 1969 (12)
- Genus Orconectes Cope, 1872 (7)
- Genus Palaeocambarus Taylor, Schram & Shen, 1999 †
- Genus Paracambarus Ortmann, 1906 accepted as Procambarus Ortmann, 1905
- Genus Procambarus Ortmann, 1905 (169)
- Genus Troglocambarus Hobbs, 1942 (1)
- Family Cambaroididae Villalobos, 1955 (6)
- Family Cricoidoscelosidae Taylor, Schram & Shen, 1999 † accepted as Cambaroididae Villalobos, 1955
- Family Euastacidae Riek, 1959 accepted as Parastacidae Huxley, 1879
- Family Potamobiidae Huxley, 1879 accepted as Astacidae Latreille, 1802
- Superfamily Enoplometopoidea de Saint Laurent, 1988 (11)
- Superfamily Nephropoidea Dana, 1852 (59)
- Superfamily Nepropoidea Dana, 1852 accepted as Nephropoidea Dana, 1852
- Superfamily Parastacoidea Huxley, 1879 (218)
- Superfamily Protastacoidea Albrecht, 1983 †
- Superfamily Stenochiroidea Beurlen, 1928 †
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 883)
- 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