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)
- 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)
- Family Annuntidiogenidae Fraaije, 2014 †
- Family Calcinidae Fraaije, Van Bakel & Jagt, 2017 accepted as Diogenidae Ortmann, 1892
- Family Cenobitidae Dana, 1851 accepted as Coenobitidae Dana, 1851
- Family Coenobitidae Dana, 1851 (18)
- Family Diogenidae Ortmann, 1892 (488)
- Family Eupaguridae Terao, 1915 accepted as Paguridae Latreille, 1802
- Family Hapalogastridae Brandt, 1850 accepted as Hapalogastrinae Brandt, 1850
- Family Lithodidae Samouelle, 1819 (136)
- Family Ostraconotidae Terao, 1915 accepted as Paguridae Latreille, 1802
- Family Paguridae Latreille, 1802 (615)
- Family Paguristidae Terao, 1915 accepted as Diogenidae Ortmann, 1892
- Family Paguropsidae Fraaije, Van Bakel, Jagt, Charbonnier, Schweigert, Garcia & Valentin, 2022 accepted as Diogenidae Ortmann, 1892
- Family Parapaguridae Smith, 1882 (92)
- Family Parapylochelidae Forest, 1987 accepted as Pylochelidae Spence Bate, 1888
- Family Pilgrimchelidae Fraaije, 2014 †
- Family Pomatochelidae Stebbing, 1914 accepted as Pylochelidae Spence Bate, 1888
- Family Probeebeidae Boone, 1926 accepted as Parapaguridae Smith, 1882
- Family Pylochelidae Spence Bate, 1888 (47)
- Family Pylojacquesidae McLaughlin & Lemaitre, 2001 (2)
- Family Schobertellidae Schweigert, Fraaije, Havlik & Nützel, 2013 †
- Family Xylopaguridae Gašparič, Fraaije, Robin & de Angeli, 2016 (7)
- 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