Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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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)
- Family Anacalliacidae Manning & Felder, 1991 (3)
- Family Axiidae Huxley, 1879 (223)
- Family Callianassidae Dana, 1852 (141)
- Family Callianideidae Kossman, 1880 (19)
- Family Callianopsidae Manning & Felder, 1991 (7)
- Family Callichiridae Manning & Felder, 1991 (101)
- Family Calocaridae Ortmann, 1891 accepted as Axiidae Huxley, 1879
- Family Calocarididae Ortmann, 1891 accepted as Axiidae Huxley, 1879
- Family Ctenochelidae Manning & Felder, 1991 (32)
- Family Eiconaxiidae Sakai & Ohta, 2005 accepted as Axiidae Huxley, 1879
- Family Eiconaxiopsididae Sakai, 2011 accepted as Axiidae Huxley, 1879
- Family Eucalliacidae Manning & Felder, 1991 (27)
- Family Gourretiidae Sakai, 1999 accepted as Ctenochelidae Manning & Felder, 1991
- Family Micheleidae Sakai, 1992 (35)
- Family Neoaxiidae Sakai, 2017 accepted as Axiidae Huxley, 1879
- Family Paracalliacidae Sakai, 2005 (1)
- Family Strahlaxiidae Poore, 1994 (11)
- Family Thomassiniidae de Saint Laurent, 1979 accepted as Callianideidae Kossman, 1880
- Family Tosacallianassidae Sakai, 2016 accepted as Ctenochelidae Manning & Felder, 1991
- Family Venipaguridae Collins, 2011 †
- 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