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)
- Genus Evibacus Smith, 1869 (1)
- Genus Ibaccus Leach, 1815 accepted as Ibacus Leach, 1815
- Genus Ibacus Leach, 1815 (8)
- Genus Palibacus Förster, 1984 †
- Genus Parribacus Dana, 1852 (6)
- Species Parribacus antarcticus (Lund, 1793)
- Species Parribacus caesius Squires, 2001 † accepted as Llajassus caesius (Squires, 2001) †
- Species Parribacus caledonicus Holthuis, 1960
- Species Parribacus cristatus Förster, 1984 † accepted as Parsacus cristatus (Förster, 1984) †
- Species Parribacus holthuisi Forest, 1954
- Species Parribacus japonicus Holthuis, 1960
- Species Parribacus papyraceus Rathbun, 1906 accepted as Parribacus antarcticus (Lund, 1793)
- Species Parribacus perlatus Holthuis, 1967
- Species Parribacus scarlatinus Holthuis, 1960
- Species Parribacus ursus (Herbst, 1793)
- Subspecies Parribacus ursus major (Herbst, 1793) accepted as Parribacus antarcticus (Lund, 1793)
- Subfamily Scyllarinae Latreille, 1825 (55)
- 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