Between brackets is the number of accepted extant species

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- Decapoda (17 679)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (534)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 145)
- Infraorder Achelata (153)
- Infraorder Anomura (3 414)
- Superfamily Aegloidea Dana, 1852 (97)
- Superfamily Birgusoidea Watabe, 2007 accepted as Paguroidea Latreille, 1802
- Superfamily Cancellochelloidea Watabe, 2007 accepted as Paguroidea Latreille, 1802
- Superfamily Cheiroplatoidea Watabe, 2007 accepted as Paguroidea Latreille, 1802
- Superfamily Chirostyloidea Ortmann, 1892 (419)
- Superfamily Eocarcinoidea Withers, 1932 †
- Superfamily Galatheoidea Samouelle, 1819 (1 406)
- Family Catillogalatheidae Robins, Feldman, Schweitzer & Bonde, 2016 †
- Family Galateadae Samouelle, 1819 accepted as Galatheidae Samouelle, 1819
- Family Galatheidae Samouelle, 1819 (278)
- Subfamily Galatheinae Samouelle, 1819 accepted as Galatheidae Samouelle, 1819
- Genus Acanthogalathea Müller & Collins, 1991 †
- Genus Alainius Baba, 1991 (1)
- Genus Allogalathea Baba, 1969 (4)
- Genus Allomunida Baba, 1988 (1)
- Genus Bolcagalathea Beschin, Busulini, Tessier & Zorzin, 2016 †
- Species Bolcagalathea bolcensis (Beschin, Busulini, Tessier & Zorzin, 2016) †
- Species Bolcagalathea corallina Beschin, Busulini, Tessier & Zorzin, 2016 †
- Species Bolcagalathea multispinosa Beschin, Busulini, Tessier & Zorzin, 2016 †
- Species Bolcagalathea venetica Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Calypso Risso, 1816 accepted as Janira Risso, 1816
- Genus Coralliogalathea Baba & Javed, 1974 (7)
- Genus Eomunidopsis Vía Boada, 1981 †
- Genus Fennerogalathea Baba, 1988 (5)
- Genus Galathea Fabricius, 1793 (193)
- Genus Janira Risso, 1816 accepted as Galathea Fabricius, 1793
- Genus Lauriea Baba, 1971 (7)
- Genus Lessinigalathaea De Angeli & Garassino, 2002 † accepted as Lessinigalathea De Angeli & Garassino, 2002 †
- Genus Lessinigalathea De Angeli & Garassino, 2002 †
- Genus Luisogalathea Karasawa & Hayakawa, 2000 †
- Genus Macrothea Macpherson & Cleva, 2010 (1)
- Genus Nanogalathea Tirmizi & Javed, 1980 (3)
- Genus Palaeomunida Lőrenthey, 1902 †
- Genus Phylladiorhynchus Baba, 1969 (55)
- Genus Tethysgalathea Klompmaker, Robins, Jakobsen & Sheldon, 2022 †
- Genus Triodonthea Macpherson & Robainas-Barcia, 2013 (1)
- Family Galatheoidea incertae sedis †
- Family Munididae Ahyong, Baba, Macpherson & Poore, 2010 (502)
- Family Munidopsidae Ortmann, 1898 (313)
- Family Paragalatheidae Robins, Feldman, Schweitzer & Bonde, 2016 †
- Family Porcellanidae Haworth, 1825 (313)
- Family Retrorsichelidae Feldmann, Tshudy & Thomson, 1993 †
- Superfamily Gastrodoroidea Van Bakel, Fraaije, Jagt & Artal, 2008 †
- Superfamily Hippoidea Latreille, 1825 (86)
- Superfamily Kiwaoidea Macpherson, Jones & Segonzac, 2005 accepted as Chirostyloidea Ortmann, 1892
- Superfamily Lithodoidea Samouelle, 1819 accepted as Lithodidae Samouelle, 1819
- Superfamily Lomisoidea Bouvier, 1894 (1)
- Superfamily Paguroidea Latreille, 1802 (1 405)
- Superfamily Pomatocheloidea Watabe, 2007 accepted as Paguroidea Latreille, 1802
- Superfamily Pylocheloidea Watabe, 2007 accepted as Paguroidea Latreille, 1802
- Infraorder Astacidea (781)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 883)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 916)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida