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)
- Superfamily Palinuroidea Latreille, 1802 accepted as Achelata
- Family Achelata incertae sedis †
- Family Cancrinidae Buerlen, 1930 †
- Family Palinuridae Latreille, 1802 (61)
- Family Scyllaridae Latreille, 1825 (92)
- Subfamily Arctidinae Holthuis, 1985 (17)
- Subfamily Ibacinae Holthuis, 1985 (15)
- Subfamily Scyllarinae Latreille, 1825 (55)
- Genus Acantharctus Holthuis, 2002 (3)
- Genus Antarctus Holthuis, 2002 (1)
- Genus Antipodarctus Holthuis, 2002 accepted as Crenarctus Holthuis, 2002
- Genus Arctus De Haan, 1849 accepted as Scyllarus Fabricius, 1775
- Genus Bathyarctus Holthuis, 2002 (7)
- Genus Biarctus Holthuis, 2002 (4)
- Genus Chelarctus Holthuis, 2002 (4)
- Genus Chrysoma Risso, 1827 accepted as Scyllarus Fabricius, 1775
- Genus Crenarctus Holthuis, 2002 (2)
- Genus Eduarctus Holthuis, 2002 (8)
- Genus Galearctus Holthuis, 2002 (8)
- Species Galearctus aurora (Holthuis, 1982)
- Species Galearctus avulsus Yang, Chen & Chan, 2011
- Species Galearctus kitanoviriosus (Harada, 1962)
- Species Galearctus lipkei Yang & Chan, 2010
- Species Galearctus rapanus (Holthuis, 1993)
- Species Galearctus timidus (Holthuis, 1960)
- Species Galearctus umbilicatus (Holthuis, 1977)
- Species Galearctus yuanshi Yang & Chan, 2020
- Genus Gibbularctus Holthuis, 2002 (1)
- Genus Petrarctus Holthuis, 2002 (6)
- Genus Remiarctus Holthuis, 2002 (1)
- Genus Scammarctus Holthuis, 2002 (1)
- Genus Scyllarus Fabricius, 1775 (9)
- Subfamily Theninae Holthuis, 1985 (5)
- Genus Acanthophoenicides Audo & Charbonnier, 2012 †
- Genus Llajassus Nyborg & Garassino, 2017 †
- Genus Nisto Sarato, 1885 accepted as Scyllarus Fabricius, 1775
- Genus Parsacus Garassino, Bahrami, Yazdi & Vega, 2014 †
- Genus Pseudibacus Guérin-Méneville, 1855 accepted as Scyllarides Gill, 1898
- Genus Scyllarella Rathbun, 1935 †
- Genus Scyllaridia Bell, 1858 † accepted as Scyllarides Gill, 1898
- Genus Scyllibacus Desjardins, 1831 accepted as Thenus Leach, 1816
- Genus Yalomus Rafinesque, 1815 accepted as Scyllarus Fabricius, 1775
- Infraorder Anomura (3 414)
- 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