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)
- Superfamily Grapsoidea MacLeay, 1838 (645)
- Family Brankocleistostomidae Števčić, 2011 accepted as Gaeticinae Davie & Ng, 2007
- Family Gecarcinidae MacLeay, 1838 (27)
- Family Gegarcinidae MacLeay, 1838 accepted as Gecarcinidae MacLeay, 1838
- Family Glyptograpsidae Schubart, Cuesta & Felder, 2002 (3)
- Family Grapsidae MacLeay, 1838 (39)
- Family Grapsoidea incertae sedis †
- Family Leptograpsodidae Guinot, Ng & Rodriguez Moreno, 2018 (1)
- Family Percnidae Števčić, 2005 (7)
- Family Plagusiidae Dana, 1851 (21)
- Family Sesarmidae Dana, 1851 (348)
- Family Varunidae H. Milne Edwards, 1853 (196)
- Subfamily Asthenognathinae Stimpson, 1858 (3)
- Subfamily Cyclograpsinae H. Milne Edwards, 1853 (59)
- Subfamily Gaeticinae Davie & Ng, 2007 (14)
- Subfamily Pinnotherelinae Alcock, 1900 (1)
- Subfamily Thalassograpsinae Davie & Ng, 2007 (1)
- Subfamily Varuninae H. Milne Edwards, 1853 (103)
- Tribe Euchirograpsini Števčić, 2005 accepted as Plagusiidae Dana, 1851
- Tribe Otognathini Števčić, 2011 accepted as Varuninae H. Milne Edwards, 1853
- Genus Brachynotus De Haan, 1833 (4)
- Genus Chhapgarus Ng, Trivedi & Bhat, 2022 (1)
- Genus Coelochirus Nauck, 1880 accepted as Ptychognathus Stimpson, 1858
- Genus Cryptograpsus Dana, 1851 accepted as Cyrtograpsus Dana, 1851
- Genus Cyrtograpsus Dana, 1851 (4)
- Genus Eoacmaeopleura De Angeli & Bellin, 2022 †
- Genus Eriocheir De Haan, 1835 (4)
- Genus Eriochirus H. Milne Edwards, 1853 accepted as Eriocheir De Haan, 1835
- Genus Gnathograpsus A. Milne-Edwards, 1868 accepted as Ptychognathus Stimpson, 1858
- Genus Grapsodius Holmes, 1900 (1)
- Genus Hemigrapsus Dana, 1851 (13)
- Genus Hypsilograpsus De Man, 1879 accepted as Pyxidognathus A. Milne-Edwards, 1879
- Genus Neoeriocheir Sakai, 1983 (1)
- Genus Noarograpsus Ng, Manuel & Ng, 2006 (1)
- Genus Orcovita Ng & Tomascik, 1994 (12)
- Genus Otognathon Ng & Števčić, 1993 (2)
- Genus Pachystomum Nauck, 1880 accepted as Pseudograpsus H. Milne Edwards, 1837
- Genus Paraeriocheir Sakai, 2013 accepted as Eriocheir De Haan, 1835
- Genus Parapyxidognathus Ward, 1941 (4)
- Genus Parvonotus Davie & Ng, 2024 (3)
- Genus Platyeriocheir Ng, Guo & Ng, 1999 (1)
- Genus Pseudogaetice Davie & Ng, 2007 (1)
- Genus Pseudograpsus H. Milne Edwards, 1837 (4)
- Genus Ptychognathus Stimpson, 1858 (32)
- Genus Pyxidognathus A. Milne-Edwards, 1879 (2)
- Genus Sakakurapus Karasawa, 2018 †
- Genus Scutumara Ng & Nakasone, 1993 (3)
- Genus Shurebus Verany, 1846 accepted as Brachynotus De Haan, 1833
- Genus Tetragrapsus Rathbun, 1918 (1)
- Genus Utica White, 1847 (7)
- Genus Varuna H. Milne Edwards in Bory de Saint Vincent, 1830 (2)
- Species Varuna altimana Rathbun, 1914 accepted as Ptychognathus altimanus (Rathbun, 1914)
- Species Varuna angustifrons Karasawa, 1993 † accepted as Carinocarcinoides angustifrons (Karasawa, 1993) †
- Species Varuna atlantica Melliss, 1875 accepted as Planes major (MacLeay, 1838)
- Species Varuna litterata (Fabricius, 1798)
- Species Varuna tomentosa Pfeffer, 1889 accepted as Varuna litterata (Fabricius, 1798)
- Species Varuna yui Hwang & Takeda, 1986
- Genus Hemiplax Heller, 1865 (1)
- Genus Tritodynamia Ortmann, 1894 (14)
- Family Xenograpsidae Ng, Davie, Schubart & Ng, 2007 (3)
- 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