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)
- 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)
- 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)
- Genus Aliaporcellana Nakasone & Miyake, 1969 (6)
- Genus Allopetrolisthes Haig, 1960 (3)
- Genus Ancylocheles Haig, 1978 (2)
- Genus Beripetrolisthes De Angeli & Garassino, 2002 †
- Genus Capilliporcellana Haig, 1978 (2)
- Genus Clastotoechus Haig, 1960 (6)
- Genus Cretacolana Schweitzer & Feldmann, 2012 †
- Genus Disipia Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Enostea Gistel, 1848 accepted as Porcellana Lamarck, 1801
- Genus Enosteoides Johnson, 1970 (9)
- Genus Eopetrolisthes De Angeli & Garassino, 2002 †
- Genus Euceramus Stimpson, 1860 (3)
- Genus Eulenaios Ng & Nakasone, 1993 (1)
- Genus Heteropolyonyx Osawa, 2001 (1)
- Genus Heteroporcellana Haig, 1978 (1)
- Genus Liopetrolisthes Haig, 1960 (2)
- Genus Lissoporcellana Haig, 1978 (10)
- Genus Lobipetrolisthes De Angeli & Garassino, 2002 †
- Genus Longoporcellana Müller & Collins, 1991 †
- Genus Madarateuchus Harvey, 1999 accepted as Clastotoechus Haig, 1960
- Genus Magalobrachium Stimpson, 1858 accepted as Megalobrachium Stimpson, 1858
- Genus Megalobrachium Stimpson, 1858 (13)
- Genus Minyocerus Stimpson, 1858 (2)
- Genus Montemagrelisthes De Angeli & Ceccon, 2017 †
- Genus Neopetrolisthes Miyake, 1937 (3)
- Genus Neopisosoma Haig, 1960 (7)
- Genus Novorostrum Osawa, 1998 (4)
- Genus Orthochela Glassell, 1936 (1)
- Genus Pachycheles Stimpson, 1858 (48)
- Genus Parapetrolisthes Haig, 1962 (1)
- Genus Paraporcellana Beschin, Busulini, Tessier & Zorzin, 2016 †
- Genus Percellana Lamarck, 1801 accepted as Porcellana Lamarck, 1801
- Genus Petrocheles Miers, 1876 (2)
- Genus Petrolisthes Stimpson, 1858 (115)
- Genus Pisidia Leach, 1821 (14)
- Genus Pisisoma Stimpson, 1858 accepted as Pisosoma Stimpson, 1858
- Genus Pisonella Glassell, 1938 accepted as Megalobrachium Stimpson, 1858
- Genus Pisosoma Stimpson, 1858 accepted as Pachycheles Stimpson, 1858
- Genus Platycheles Billberg, 1820 accepted as Porcellana Lamarck, 1801
- Genus Polyonix Stimpson, 1858 accepted as Polyonyx Stimpson, 1858
- Genus Polyonyx Stimpson, 1858 (32)
- Genus Porcellana Lamarck, 1801 (15)
- Genus Porcellanella White, 1851 (2)
- Species Porcellanella haigae Sankarankutty, 1963
- Species Porcellanella picta Stimpson, 1858 accepted as Porcellanella triloba White, 1851
- Species Porcellanella quadrilobata (Miers, 1884) accepted as Lissoporcellana quadrilobata (Miers, 1884)
- Species Porcellanella triloba White, 1851
- Genus Porcellanides Czerniavsky, 1884 accepted as Lissoporcellana Haig, 1978
- Genus Porcellanides Nobili, 1901 accepted as Megalobrachium Stimpson, 1858
- Genus Porcellanopsis Rathbun, 1910 accepted as Magalobrachium Stimpson, 1858
- Genus Porcellaria Gray, 1831 accepted as Porcellana Lamarck, 1801
- Genus Porcellina Müller, 1862 accepted as Minyocerus Stimpson, 1858
- Genus Pseudoporcellanella Sankarankutty, 1962 (1)
- Genus Raphidopus Stimpson, 1858 (6)
- Genus Spathagalathea De Angeli & Garassino, 2002 †
- Genus Streptochirus Stimpson, 1907 accepted as Pisidia Leach, 1821
- Genus Ulloaia Glassell, 1938 (1)
- Genus Vibrissalana Robins & Klompmaker, 2019 †
- 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 (783)
- 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