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)
- Genus Andamanium Naruse & Ng, 2020 (1)
- Genus Aratus H. Milne Edwards, 1853 (2)
- Genus Armases Abele, 1992 (13)
- Genus Bresedium Serène & Soh, 1970 (3)
- Genus Chiromantes Gistel, 1848 (2)
- Genus Chriselatium Ng & Wowor, 2024 (1)
- Genus Circulium Naruse & Ng, 2020 (5)
- Genus Clistocoeloma A. Milne-Edwards, 1873 (10)
- Genus Contusarma Schubart & Ng, 2020 (2)
- Genus Cristarma Schubart & Ng, 2020 (2)
- Genus Cyclorma Naruse & Ng, 2012 (1)
- Genus Danarma Schubart & Ng, 2020 (5)
- Species Danarma eurymerus (Davie & Ng, 2013)
- Species Danarma garfunkel (Davie & Ng, 2013)
- Species Danarma leptomerus (Davie & Ng, 2013)
- Species Danarma obtusifrons (Dana, 1851)
- Species Danarma silus (Davie & Ng, 2013)
- Genus Eneosesarma Brösing, Spiridonov, Al-Aidaroos & Türkay, 2014 (1)
- Genus Episesarma De Man, 1895 (7)
- Genus Fasciarma Shahdadi & Schubart, 2017 (1)
- Genus Geosesarma De Man, 1892 (75)
- Genus Guinearma Shahdadi & Schubart, 2017 (3)
- Genus Haberma Ng & Schubart, 2002 (3)
- Genus Karstarma Davie & Ng, 2007 (18)
- Genus Labuanium Serène & Soh, 1970 (1)
- Genus Leptarma Shahdadi, Fratini & Schubart, 2020 (22)
- Genus Lithoselatium Schubart, Liu & Ng, 2009 (3)
- Genus Manarma Schubart & Ng, 2020 (2)
- Genus Metagrapsus H. Milne Edwards, 1853 (1)
- Genus Metasesarma H. Milne Edwards, 1853 (2)
- Genus Metopaulias Rathbun, 1896 (1)
- Genus Miersarma Schubart & Ng, 2020 (1)
- Genus Migmarma Schubart & Ng, 2020 (3)
- Genus Mindanium Naruse & Ng, 2020 (1)
- Genus Muradium Serène & Soh, 1970 (1)
- Genus Namlacium Serène & Soh, 1970 (1)
- Genus Nanosesarma Tweedie, 1951 (11)
- Genus Neoepisesarma Serène & Soh, 1970 accepted as Episesarma De Man, 1895
- Genus Neosarmatium Serène & Soh, 1970 (18)
- Genus Neosesarma Serène & Soh, 1970 (3)
- Genus Orisarma Schubart & Ng, 2020 (6)
- Genus Parasesarma De Man, 1895 (58)
- Genus Perisesarma De Man, 1895 (1)
- Genus Platychirarma Schubart & Ng, 2020 (1)
- Genus Pseudosesarma Serène & Soh, 1970 (6)
- Genus Sarmatium Dana, 1851 (5)
- Genus Scandarma Schubart, Liu & Cuesta, 2003 (7)
- Genus Selatium Serène & Soh, 1970 (2)
- Genus Sesarma Say, 1817 (19)
- Genus Sesarmoides Serène & Soh, 1970 (3)
- Genus Sesarmops Serène & Soh, 1970 (9)
- Genus Shinobium Naruse & Ng, 2020 (1)
- Genus Sinosesarma Ng, Shih & Cannicci, 2019 (1)
- Genus Stelgistra Ng & Liu, 1999 (1)
- Genus Tiomanium Serène & Soh, 1970 (1)
- Genus Trapezarma Schubart & Ng, 2020 (1)
- Family Varunidae H. Milne Edwards, 1853 (196)
- 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