Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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- Decapoda (17 688)
- Suborder Decapoda incertae sedis †
- Suborder Dendrobranchiata (533)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Macrura reptantia
- Suborder Natantia
- Suborder Pleocyemata (17 155)
- Infraorder Achelata (153)
- Infraorder Anomura (3 416)
- Infraorder Astacidea (783)
- Infraorder Axiidea (600)
- Infraorder Brachyura (7 884)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 920)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Superfamily Eryonoidea De Haan, 1841 (38)
- Family Coleiidae Van Straelen, 1925 †
- Subfamily Proeryoninae Audo, Schweigert & Charbonnier, 2020 †
- Genus Angusteryon Audo & Furrer, 2020 †
- Genus Coleia Broderip, 1835 †
- Genus Gabaleryon Audo, Williams, Charbonnier & Schweigert, 2016 †
- Genus Palaeopolycheles von Knebel, 1907 †
- Species Palaeopolycheles crymensis Levitski, 1974 † accepted as Tauricheles crymensis (Levitski, 1974) †
- Species Palaeopolycheles Falloti Van Straelen, 1923 † accepted as Hellerocaris falloti (Van Straelen, 1923) †
- Species Palaeopolycheles longipes (Fraas, 1855) †
- Species Palaeopolycheles nantosueltae Jauvion, Audo, Bernard, Vannier, Daley & Charbonnier, 2020 †
- Genus Proeryon Buerlen, 1928 †
- Genus Tropifer Gould, 1857 †
- Genus Willemoesiocaris Van Straelen, 1925 †
- Family Eryonidae De Haan, 1841 †
- Family Eryonoidea incertae sedis †
- Family Palaeopentachelidae Ahyong, 2009 †
- Family Polychelidae Wood-Mason, 1874 (38)
- Family Tetrachelidae Beurlen, 1930 †
- Family Polychelida incertae sedis †
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (101)
- Suborder Reptantia
- Suborder Trichelida