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)
- Family Anacalliacidae Manning & Felder, 1991 (3)
- Family Axiidae Huxley, 1879 (223)
- Subfamily Coralaxiinae Sakai & de Saint Laurent, 1989 accepted as Axiidae Huxley, 1879
- Genus Acanthaxius Sakai & de Saint Laurent, 1989 (10)
- Genus Albatrossaxius Sakai, 2011 accepted as Spongiaxius Sakai & de Saint Laurent, 1989
- Genus Alienaxiopsis Sakai, 2011 (1)
- Genus Allaxiopsis Sakai, 2011 (2)
- Genus Allaxius Sakai & de Saint Laurent, 1989 (1)
- Genus Amakusaxius Sakai, 2011 (1)
- Genus Ambiaxiopsis Komai, 2011 (1)
- Genus Ambiaxius Sakai & de Saint Laurent, 1989 (10)
- Genus Anomalaxius Sakai & Türkay, 2012 accepted as Axianassa Schmitt, 1924
- Genus Anophthalmaxius De Man, 1905 (1)
- Genus Aperiopyxis Schweigert, 2009 †
- Genus Aptaxiopsis Ferratges, Hyžný & Zamora, 2021 †
- Genus Aura Münster, 1839 † accepted as Magila Münster, 1839 †
- Genus Australocaris Poore & Collins, 2009 (1)
- Genus Axia Leach, 1816 accepted as Axius Leach, 1816
- Genus Axiopsis Borradaile, 1903 (8)
- Genus Axiorygma Kensley & Simmons, 1988 (1)
- Genus Axius Leach, 1816 (3)
- Genus Balssaxius Sakai, 2011 accepted as Calocarides Wollebaek, 1908
- Genus Bathyaxius Sakai, 2014 (1)
- Genus Boasaxius Sakai, 2011 (1)
- Genus Bouvieraxius Sakai & de Saint Laurent, 1989 (4)
- Genus Briancaris Sakai & Ohta, 2005 accepted as Ambiaxius Sakai & de Saint Laurent, 1989
- Genus Bruceaxius Sakai, 2011 accepted as Guyanacaris Sakai, 2011
- Genus Calastacus Faxon, 1893 (11)
- Genus Calaxidium Sakai, 2014 accepted as Manaxius Kensley, 2003
- Genus Calaxiopsis Sakai & de Saint Laurent, 1989 (2)
- Genus Calaxius Sakai & de Saint Laurent, 1989 (6)
- Genus Callistocaris Kensley, 1989 accepted as Ambiaxius Sakai & de Saint Laurent, 1989
- Genus Calocarides Wollebaek, 1908 (14)
- Genus Calocaris Bell, 1846 (6)
- Genus Calocarisopsis Sakai, 2011 accepted as Calocaris Bell, 1846
- Genus Campanaxius Nyborg, Hyžný & Haggart, 2023 †
- Genus Carolinaxius Kou, Poore & Li, 2021 (1)
- Genus Coelhocalaxius Sakai, 2011 accepted as Calaxius Sakai & de Saint Laurent, 1989
- Genus Colemanaxius Sakai, 2011 accepted as Manaxius Kensley, 2003
- Genus Coralaxius Kensley & Gore, 1981 (3)
- Genus Cretaxiopsis Charbonnier, Audo, Garassino & Hyžný, 2017 †
- Genus Devonoaxius Feldmann & Schweitzer, 2019 †
- Genus Dorphinaxius Sakai & de Saint Laurent, 1989 (1)
- Genus Eiconaxiopsis Sakai, 2011 accepted as Eiconaxius Spence Bate, 1888
- Genus Eiconaxius Spence Bate, 1888 (40)
- Genus Etallonia Oppel, 1861 †
- Genus Eucalastacus Sakai, 1992 (1)
- Genus Euconaxius Bate, 1888 accepted as Eiconaxius Spence Bate, 1888
- Genus Eutrichocheles Wood-Mason, 1876 (2)
- Genus Evaxius Kingsley, 1882 accepted as Scytoleptus Gerstaecker, 1856
- Genus Ezaxius de Matos-Pita & Ramil, 2015 accepted as Calaxiopsis Sakai & de Saint Laurent, 1989
- Genus Formosaxius Komai, Lin & Chan, 2010 (1)
- Genus Guyanacaris Sakai, 2011 (7)
- Species Guyanacaris caespitosa (Squires, 1979)
- Species Guyanacaris hirsutimana (Boesch & Smalley, 1972)
- Species Guyanacaris keralam Padate, Cubelio & Takeda, 2022
- Species Guyanacaris polychaetes (Sakai, 1994)
- Species Guyanacaris spinosissima (Rathbun, 1906)
- Species Guyanacaris thailandensis (Sakai, 2015)
- Species Guyanacaris xinzhengi Kou, Poore & Liu, 2024
- Genus Heterocalaxius Sakai, 2011 accepted as Manaxius Kensley, 2003
- Genus Hinecaris Karasawa, Kishimoto, Ohara & Ando, 2019 †
- Genus Huxleycaris Bravi & Garassino, 1998 †
- Genus Iconaxiopsis Alcock, 1901 accepted as Eiconaxius Spence Bate, 1888
- Genus Iconaxius Faxon, 1893 accepted as Eiconaxius Spence Bate, 1888
- Genus Leonardsaxius Sakai, 2011 (3)
- Genus Levantocaris Galil & Clark, 1993 (1)
- Genus Libanoaxius Charbonnier, Audo, Garassino & Hyžný, 2017 †
- Genus Litoraxius Komai & Tachikawa, 2007 (1)
- Genus Lophaxiopsis Sakai, 2011 (1)
- Genus Lophaxius Kensley, 1989 (3)
- Genus Magila Münster, 1839 †
- Genus Manaxius Kensley, 2003 (18)
- Genus Marianaxius Kensley, 1996 (1)
- Genus Megachela Schweigert, 2003 †
- Genus Meinertaxius Sakai, 2011 accepted as Coralaxius Kensley & Gore, 1981
- Genus Michelaxiopsis Poore & Collins, 2009 (2)
- Genus Montanaxius Dworschak, 2016 (2)
- Genus Newzealandaxius Sakai, 2011 accepted as Spongiaxius Sakai & de Saint Laurent, 1989
- Genus Nipponcalaxiopsis Sakai, 2011 accepted as Calaxiopsis Sakai & de Saint Laurent, 1989
- Genus Oxyrhynchaxius Parisi, 1917 (3)
- Genus Palaeoaxius Patrulius, 1959 † accepted as Magila Münster, 1839 †
- Genus Paracalocaris Sakai, 1991 accepted as Lophaxius Kensley, 1989
- Genus Parascytoleptus Sakai & de Saint Laurent, 1989 (2)
- Genus Paratrichocheles Sakai, 2011 accepted as Paraxiopsis De Man, 1905
- Genus Paraxiopsis De Man, 1905 (18)
- Genus Paraxius Bate, 1888 (1)
- Genus Pilbaraxius Poore & Collins, 2009 (1)
- Genus Pillsburyaxius Sakai, 2011 (5)
- Genus Planaxius Komai & Tachikawa, 2008 (1)
- Genus Platyaxiopsis Sakai, 2011 accepted as Spongiaxius Sakai & de Saint Laurent, 1989
- Genus Platyaxius Sakai, 1994 accepted as Spongiaxius Sakai & de Saint Laurent, 1989
- Genus Plioaxius Fraaije, Van Bakel, Jagt & Mollen, 2011 † accepted as Axius Leach, 1816
- Genus Posthonocaris Kensley, 1989 accepted as Bouvieraxius Sakai & de Saint Laurent, 1989
- Genus Protaxius Beurlen, 1930 †
- Genus Pseudoaxiopsis Sakai, 2011 (1)
- Genus Ralumcaris Sakai, 2011 (1)
- Genus Sakaiocaris Kensley, 1989 accepted as Spongiaxius Sakai & de Saint Laurent, 1989
- Genus Schlueteria Fritsch in Fritsch & Kafka, 1887 †
- Genus Schlüteria Fritsch in Fritsch & Kafka, 1887 † accepted as Schlueteria Fritsch in Fritsch & Kafka, 1887 †
- Genus Scytoleptus Gerstaecker, 1856 (2)
- Genus Spongiaxius Sakai & de Saint Laurent, 1989 (15)
- Family Callianassidae Dana, 1852 (141)
- Family Callianideidae Kossman, 1880 (19)
- Family Callianopsidae Manning & Felder, 1991 (7)
- Family Callichiridae Manning & Felder, 1991 (101)
- Family Calocaridae Ortmann, 1891 accepted as Axiidae Huxley, 1879
- Family Calocarididae Ortmann, 1891 accepted as Axiidae Huxley, 1879
- Family Ctenochelidae Manning & Felder, 1991 (32)
- Family Eiconaxiidae Sakai & Ohta, 2005 accepted as Axiidae Huxley, 1879
- Family Eiconaxiopsididae Sakai, 2011 accepted as Axiidae Huxley, 1879
- Family Eucalliacidae Manning & Felder, 1991 (27)
- Family Gourretiidae Sakai, 1999 accepted as Ctenochelidae Manning & Felder, 1991
- Family Micheleidae Sakai, 1992 (35)
- Family Neoaxiidae Sakai, 2017 accepted as Axiidae Huxley, 1879
- Family Paracalliacidae Sakai, 2005 (1)
- Family Strahlaxiidae Poore, 1994 (11)
- Family Thomassiniidae de Saint Laurent, 1979 accepted as Callianideidae Kossman, 1880
- Family Tosacallianassidae Sakai, 2016 accepted as Ctenochelidae Manning & Felder, 1991
- Family Venipaguridae Collins, 2011 †
- 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