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)
- Infraorder Brachyura (7 883)
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 919)
- Section Amphionidea accepted as Caridea
- Section Penaeidea accepted as Dendrobranchiata
- Superfamily Alpheoidea Rafinesque, 1815 (1 229)
- Family Alpheidae Rafinesque, 1815 (822)
- Genus Acanthanas Anker, Poddoubtchenko & Jeng, 2006 (1)
- Genus Alberta Kazmi & Kazmi, 2010 accepted as Pseudathanas Bruce, 1983
- Genus Alphaeus Fabricus, 1798 accepted as Alpheus Fabricius, 1798
- Genus Alpheinus Borradaile, 1900 accepted as Synalpheus Spence Bate, 1888
- Genus Alpheoides Paulson, 1875 accepted as Alpheus Fabricius, 1798
- Genus Alpheopsis Coutière, 1897 (26)
- Genus Alpheus Fabricius, 1798 (344)
- Genus Alphous Fabricius, 1798 accepted as Alpheus Fabricius, 1798
- Genus Amphibetaeus Coutière, 1897 (1)
- Genus Anebocaris Spence Bate, 1888
- Genus Arete Stimpson, 1860 (4)
- Genus Arethusa De Man, 1887
- Genus Aretopsis De Man, 1910 (3)
- Genus Asphalius Roux, 1831 accepted as Alpheus Fabricius, 1798
- Genus Athanas Leach, 1814 (44)
- Genus Athanopsis Coutière, 1897 (9)
- Genus Automate De Man, 1888 (14)
- Genus Autonomaea Risso, 1816 accepted as Alpheus Fabricius, 1798
- Genus Autonomea Risso, 1816 accepted as Autonomaea Risso, 1816
- Genus Bannereus Bruce, 1988 (3)
- Genus Batella Holthuis, 1955 (3)
- Genus Batellopsis Ashrafi, Ďuriš & Anker, 2024 (1)
- Genus Bermudacaris Anker & Iliffe, 2000 (3)
- Genus Betaeopsis Yaldwyn, 1971 (3)
- Genus Betaeus Dana, 1852 (16)
- Genus Bruceopsis Anker, 2010 (2)
- Genus Caligoneus Komai & Fujita, 2018 (1)
- Genus Cavipelta Hayashi, 1998 accepted as Stenalpheops Miya, 1997
- Genus Cheirothrix Spence Bate, 1888 accepted as Batella Holthuis, 1955
- Genus Chelomalpheus Kim, 1998 accepted as Stenalpheops Miya, 1997
- Genus Coronalpheus Wicksten, 1999 (1)
- Genus Coutieralpheus Anker & Felder, 2005 (1)
- Genus Crangon Weber, 1795 accepted as Alpheus Fabricius, 1798
- Genus Crosnierocaris Anker, 2022 (1)
- Genus Cryptophthalmus Rafinesque, 1814 accepted as Alpheus Fabricius, 1798
- Genus Deioneus Dworschak, Anker & Abed-Navandi, 2000 (1)
- Genus Diaphoropus Spence Bate, 1888
- Genus Dienecia Westwood, 1835 accepted as Alpheus Fabricius, 1798
- Genus Fenneralpheus Felder & Manning, 1986 (2)
- Genus Halopsyche de Saussure, 1857 accepted as Alpheus Fabricius, 1798
- Genus Hamalpheus Bruce & Iliffe, 1991 accepted as Betaeopsis Yaldwyn, 1971
- Genus Harperalpheus Felder & Anker, 2007 (2)
- Genus Homaralphaeus Spence Bate, 1876 accepted as Homaralpheus Spence Bate, 1888
- Genus Homaralpheus Spence Bate, 1888 accepted as Synalpheus Spence Bate, 1888
- Genus Jengalpheops Anker & Dworschak, 2007 (1)
- Genus Jousseaumea Coutière, 1897 accepted as Salmoneus Holthuis, 1955
- Genus Leptalpheus Williams, 1965 (19)
- Genus Leptathanas De Grave & Anker, 2008 (1)
- Genus Leslibetaeus Anker, Poddoubtchenko & Wehrtmann, 2006 (2)
- Genus Metabetaeus Borradaile, 1899 (4)
- Genus Metalpheus Coutière, 1908 (3)
- Genus Mohocaris Holthuis, 1973 (1)
- Genus Nauplius Risso, 1844 accepted as Alpheus Fabricius, 1798
- Genus Nennalpheus Banner & Banner, 1981 (3)
- Genus Neoalpheopsis AH Banner, 1953 accepted as Parabetaeus Coutière, 1897
- Genus Notalpheus Méndez G. & Wicksten, 1982 (1)
- Genus Oligorostra Ciampaglio & Weaver, 2008 † accepted as Alpheus Fabricius, 1798
- Genus Oligosella Ciampaglio & Weaver, 2008 † accepted as Alpheus Fabricius, 1798
- Genus Orygmalpheus De Grave & Anker, 2000 (1)
- Genus Pachelpheus Anker, 2020 (1)
- Genus Parabetaeus Coutière, 1897 (4)
- Genus Paralpheus Spence Bate, 1888 accepted as Alpheus Fabricius, 1798
- Genus Phleusa Nardo, 1847 accepted as Alpheus Fabricius, 1798
- Genus Pomagnathus Chace, 1937 (1)
- Genus Potamalpheops Powell, 1979 (17)
- Genus Prionalpheus Banner & Banner, 1960 (7)
- Genus Pseudalpheopsis Anker, 2007 (1)
- Genus Pseudathanas Bruce, 1983 (2)
- Genus Pterocaris Heller, 1862 (1)
- Genus Racilius Paulson, 1875 (1)
- Genus Richalpheus Anker & Jeng, 2006 (4)
- Genus Rugathanas Anker & Jeng, 2007 (2)
- Genus Salmoneus Holthuis, 1955 (73)
- Genus Stenalpheops Miya, 1997 (2)
- Genus Synalpheopsis Anker, 2023 (1)
- Genus Synalpheus Spence Bate, 1888 (172)
- Species Synalpheus acanthitelsonis Coutière, 1905 accepted as Synalpheus hastilicrassus Coutière, 1905
- Species Synalpheus africanus Crosnier & Forest, 1965
- Species Synalpheus agelas Pequegnat & Heard, 1979
- Species Synalpheus albatrossi Coutière, 1909
- Species Synalpheus amabilis De Man, 1910
- Species Synalpheus amintae Ramos-Tafur & Franke-Ante, 2019
- Species Synalpheus anasimus Chace, 1972
- Species Synalpheus anceps Banner, 1956
- Species Synalpheus ancistrorhynchus De Man, 1909
- Species Synalpheus androsi Coutière, 1909
- Species Synalpheus anisocheir Stebbing, 1915 accepted as Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus ankeri Hultgren & Brandt, 2015
- Species Synalpheus antenor De Man, 1910
- Species Synalpheus antillensis Coutière, 1909
- Species Synalpheus apioceros Coutière, 1909
- Species Synalpheus arostris Wicksten, 1989
- Species Synalpheus bakeri Coutière, 1908 accepted as Synalpheus fossor (Paulson, 1875)
- Species Synalpheus bannerorum Abele, 1975
- Species Synalpheus barahonensis Armstrong, 1949
- Species Synalpheus belizensis Anker & Tóth, 2008
- Species Synalpheus bispinosus De Man, 1910
- Species Synalpheus bituberculatus De Man, 1910
- Species Synalpheus biunguiculatus (Stimpson, 1860)
- Species Synalpheus bocas Anker & Tóth, 2008
- Species Synalpheus bougainvillei Coutière, 1905 accepted as Synalpheus neomeris (De Man, 1897)
- Species Synalpheus bousfieldi Chace, 1972
- Species Synalpheus brachyceros Nobili, 1906
- Species Synalpheus bradleyi Verrill, 1922
- Species Synalpheus brevicarpus (Herrick, 1891)
- Species Synalpheus brevidactylus Anker & Tóth, 2008
- Species Synalpheus brevifrons Chace, 1972
- Species Synalpheus brevispinis Coutière, 1909
- Species Synalpheus brevrostrus Wang & Sha, 2015
- Species Synalpheus Brockii Nobili, 1901 accepted as Synalpheus demani Borradaile, 1900
- Species Synalpheus brooksi Coutière, 1909
- Species Synalpheus brucei Potts, 1915 accepted as Synalpheus stimpsonii (De Man, 1888)
- Species Synalpheus calypso Ashrafi, 2024
- Species Synalpheus carinatus (De Man, 1888)
- Species Synalpheus carpenteri Macdonald & Duffy, 2006
- Species Synalpheus cayoneptunus Hultgren & Brandt, 2015
- Species Synalpheus chacei Duffy, 1998
- Species Synalpheus chaki Ashrafi & Hultgren, 2022
- Species Synalpheus charon (Heller, 1861)
- Species Synalpheus comatularum (Haswell, 1882)
- Species Synalpheus congoensis Crosnier & Forest, 1965
- Species Synalpheus consobrinus De Man, 1909 accepted as Synalpheus stimpsonii (De Man, 1888)
- Species Synalpheus corallinus Macdonald, Hultgren & Duffy, 2009
- Species Synalpheus corbariae Ashrafi & Hultgren, 2022
- Species Synalpheus coutierei Banner, 1953
- Species Synalpheus cretoculatus Banner & Banner, 1979
- Species Synalpheus crosnieri Banner & Banner, 1983
- Species Synalpheus curacaoensis Schmitt, 1924
- Species Synalpheus curaçaoensis Schmitt, 1924 accepted as Synalpheus curacaoensis Schmitt, 1924
- Species Synalpheus dardeaui (Ríos & Duffy, 2007)
- Species Synalpheus demani Borradaile, 1900
- Species Synalpheus digueti Coutière, 1909
- Species Synalpheus disparodigitus Armstrong, 1949
- Species Synalpheus dominicensis Armstrong, 1949
- Species Synalpheus dorae Bruce, 1988
- Species Synalpheus duffyi Anker & Tóth, 2008
- Species Synalpheus echinus Banner & Banner, 1975
- Species Synalpheus elizabethae (Ríos & Duffy, 2007)
- Species Synalpheus falcatus Spence Bate, 1888 accepted as Synalpheus comatularum (Haswell, 1882)
- Species Synalpheus filidigitus Armstrong, 1949
- Species Synalpheus fossor (Paulson, 1875)
- Species Synalpheus fritzmuelleri Coutière, 1909
- Species Synalpheus fritzmülleri Coutière, 1909 accepted as Synalpheus fritzmuelleri Coutière, 1909
- Species Synalpheus gambarelloides (Nardo, 1847)
- Species Synalpheus goodei Coutière, 1909
- Species Synalpheus gracilirostris De Man, 1910
- Species Synalpheus grampusi Coutière, 1909 accepted as Synalpheus pandionis Coutière, 1909
- Species Synalpheus gravieri Coutière, 1905 accepted as Synalpheus neomeris (De Man, 1897)
- Species Synalpheus gustavi Ashrafi & Hultgren, 2023
- Species Synalpheus haddoni Coutière, 1900
- Species Synalpheus harpagatrus Banner & Banner, 1975
- Species Synalpheus hastilicrassus Coutière, 1905
- Species Synalpheus heardi Dardeau, 1984
- Species Synalpheus helleri De Man, 1911 accepted as Synalpheus charon (Heller, 1861)
- Species Synalpheus hemphilli Coutière, 1909
- Species Synalpheus herdmaniae Lebour, 1938
- Species Synalpheus heroni Coutière, 1909
- Species Synalpheus herricki Coutière, 1909
- Species Synalpheus hilarulus De Man, 1910
- Species Synalpheus hoetjesi Hultgren, Macdonald & Duffy, 2010
- Species Synalpheus hululensis Coutière, 1908 accepted as Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus idios (Ríos & Duffy, 2007)
- Species Synalpheus iocasta De Man, 1909
- Species Synalpheus iphinoe De Man, 1909
- Species Synalpheus irie Macdonald, Hultgren & Duffy, 2009
- Species Synalpheus japonicus Yokoya, 1936 accepted as Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus jedanensis De Man, 1909
- Species Synalpheus jejuensis Koo & Kim, 2014
- Species Synalpheus jinqingensis Wang & Sha, 2015
- Species Synalpheus kensleyi (Ríos & Duffy, 2007)
- Species Synalpheus kuadramanus Hultgren, Macdonald & Duffy, 2010
- Species Synalpheus kusaiensis Kubo, 1940
- Species Synalpheus laevimanus (Heller, 1862) accepted as Synalpheus gambarelloides (Nardo, 1847)
- Species Synalpheus lani Hermoso & Alvarez, 2005
- Species Synalpheus latastei Coutière, 1909 accepted as Synalpheus spinifrons (H. Milne Edwards, 1837)
- Species Synalpheus laticeps Coutière, 1905
- Species Synalpheus liui Wang & Sha, 2015
- Species Synalpheus lockingtoni Coutière, 1909
- Species Synalpheus longicarpus (Herrick, 1891)
- Species Synalpheus lophodactylus Coutière, 1908
- Species Synalpheus maccullochi Coutière, 1908 accepted as Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus mac-cullochi Coutière, 1908 accepted as Synalpheus maccullochi Coutière, 1908
- Species Synalpheus macdonaldi Ashrafi & Hultgren, 2022
- Species Synalpheus macromanus Edmondson, 1925
- Species Synalpheus maxillispinus Anker & Pachelle, 2014
- Species Synalpheus mcclendoni Coutière, 1910
- Species Synalpheus merospiniger Coutière, 1908
- Species Synalpheus metaneomeris Coutière, 1921 accepted as Synalpheus streptodactylus Coutière, 1905
- Species Synalpheus mexicanus Coutière, 1909
- Species Synalpheus microneptunus Hultgren, Macdonald & Duffy, 2011
- Species Synalpheus minus (Say, 1818)
- Species Synalpheus miscellaneus De Man, 1909 accepted as Synalpheus neomeris (De Man, 1897)
- Species Synalpheus modestus De Man, 1909
- Species Synalpheus morinus Coutière, 1898 accepted as Synalpheus minus (Say, 1818)
- Species Synalpheus mortenseni Banner & Banner, 1985
- Species Synalpheus mulegensis Ríos, 1992
- Species Synalpheus mushaensis Coutière, 1908
- Species Synalpheus neomeris (De Man, 1897)
- Species Synalpheus neptunus (Dana, 1852)
- Species Synalpheus nilandensis Coutière, 1905
- Species Synalpheus nobilii Coutière, 1909
- Species Synalpheus obtusifrons Chace, 1972
- Species Synalpheus occidentalis Coutière, 1909
- Species Synalpheus odontophorus De Man, 1909
- Species Synalpheus orapilosus Hultgren, Macdonald & Duffy, 2010
- Species Synalpheus osburni Schmitt, 1933
- Species Synalpheus otiosus Coutière, 1908
- Species Synalpheus pachymeris Coutière, 1905
- Species Synalpheus pandionis Coutière, 1909
- Species Synalpheus paradoxus Banner & Banner, 1981
- Species Synalpheus paralaticeps Banner & Banner, 1982
- Species Synalpheus paraneomeris Coutière, 1905
- Species Synalpheus paraneomeris Coutière, 1899 accepted as Synalpheus paraneomeris Coutière, 1905
- Species Synalpheus paraneptunus Coutière, 1909
- Species Synalpheus parfaiti (Coutière, 1898)
- Species Synalpheus paulsoni Nobili, 1906
- Species Synalpheus paulsonoides Coutière, 1909
- Species Synalpheus pectiniger Coutière, 1907
- Species Synalpheus pentaspinosus Ashrafi, Sari & Naderloo, 2020
- Species Synalpheus peruvianus Rathbun, 1910
- Species Synalpheus pescadorensis Coutière, 1905
- Species Synalpheus physocheles Coutière, 1908 accepted as Synalpheus triunguiculatus (Paulson, 1875)
- Species Synalpheus pinkfloydi Anker, Hultgren & De Grave, 2017
- Species Synalpheus plumosetosus Macdonald, Hultgren & Duffy, 2009
- Species Synalpheus pococki Coutière, 1898
- Species Synalpheus quadriarticulatus Banner & Banner, 1975
- Species Synalpheus quadridens De Man, 1910 accepted as Synalpheus quadrispinosus De Man, 1910
- Species Synalpheus quadrispinosus De Man, 1910
- Species Synalpheus quinquedens Tattersall, 1921
- Species Synalpheus rathbunae Coutière, 1909
- Species Synalpheus readi Banner & Banner, 1972
- Species Synalpheus recessus Abele & Kim, 1989
- Species Synalpheus redactocarpus Banner, 1953
- Species Synalpheus regalis Duffy, 1996
- Species Synalpheus riosi Anker & Tóth, 2008
- Species Synalpheus ruetzleri Macdonald & Duffy, 2006
- Species Synalpheus sanctithomae Coutière, 1909
- Species Synalpheus sanjosei Coutière, 1909
- Species Synalpheus sanlucasi Coutière, 1909
- Species Synalpheus savigny (Guérin-Méneville, 1857) accepted as Alpheus savignyi Guérin-Méneville, 1857
- Species Synalpheus scaphoceris Coutière, 1910
- Species Synalpheus sciro Banner & Banner, 1975
- Species Synalpheus senegambiensis Coutière, 1908
- Species Synalpheus septemspinosus De Man, 1910
- Species Synalpheus sladeni Coutière, 1908
- Species Synalpheus sluiteri De Man, 1920 accepted as Synalpheus paraneomeris Coutière, 1905
- Species Synalpheus somalia Banner & Banner, 1979
- Species Synalpheus spinifrons (H. Milne Edwards, 1837)
- Species Synalpheus spiniger (Stimpson, 1860)
- Species Synalpheus spongicola Banner & Banner, 1981
- Species Synalpheus sponjy Ashrafi & Hultgren, 2023
- Species Synalpheus stimpsonii (De Man, 1888)
- Species Synalpheus streptodactyloides De Man, 1909 accepted as Synalpheus streptodactylus Coutière, 1905
- Species Synalpheus streptodactylus Coutière, 1905
- Species Synalpheus striatus Kubo, 1938 accepted as Synalpheus stimpsonii (De Man, 1888)
- Species Synalpheus stylopleuron Hermoso Salazar & Hendrickx, 2006
- Species Synalpheus superus Abele & Kim, 1989
- Species Synalpheus tanneri Coutière, 1909 accepted as Synalpheus herricki Coutière, 1909
- Species Synalpheus tenuispina Coutière, 1909
- Species Synalpheus thai Banner & Banner, 1966
- Species Synalpheus theano De Man, 1910
- Species Synalpheus thele Macdonald, Hultgren & Duffy, 2009
- Species Synalpheus Theophane De Man, 1910 accepted as Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus tijou Banner & Banner, 1982
- Species Synalpheus tonkinensis Wang & Sha, 2015
- Species Synalpheus townsendi Coutière, 1909
- Subspecies Synalpheus townsendi brevispinis Coutière, 1909 accepted as Synalpheus brevispinis Coutière, 1909
- Subspecies Synalpheus townsendi mexicanus Coutière, 1909 accepted as Synalpheus mexicanus Coutière, 1909
- Subspecies Synalpheus townsendi peruvianus Rathbun, 1910 accepted as Synalpheus peruvianus Rathbun, 1910
- Subspecies Synalpheus townsendi productus Coutière, 1909 accepted as Synalpheus townsendi Coutière, 1909
- Subspecies Synalpheus townsendi scaphoceris Coutière, 1910 accepted as Synalpheus scaphoceris Coutière, 1910
- Species Synalpheus triacanthus De Man, 1910
- Species Synalpheus tricuspidatus (Heller, 1861)
- Species Synalpheus tridentulatus (Dana, 1852)
- Species Synalpheus trinitatis Anker, Tavares & Mendonça, 2016
- Species Synalpheus trionyx Coutière, 1908 accepted as Synalpheus fossor (Paulson, 1875)
- Species Synalpheus trispinosus De Man, 1910
- Species Synalpheus triunguiculatus (Paulson, 1875)
- Species Synalpheus tropidodactylus Banner & Banner, 1975
- Species Synalpheus tumidomanus (Paulson, 1875)
- Species Synalpheus tuthilli Banner, 1959
- Species Synalpheus ubatuba Mantelatto, França, Cunha & Almeida, 2023
- Species Synalpheus ul (Ríos & Duffy, 2007)
- Species Synalpheus wickstenae Hermoso Salazar & Hendrickx, 2006
- Species Synalpheus williamsi Ríos & Duffy, 1999
- Species Synalpheus yano (Ríos & Duffy, 2007)
- Genus Thunor Armstrong, 1949 accepted as Alpheus Fabricius, 1798
- Genus Thuylamea Nguyên, 2001 (2)
- Genus Triacanthoneus Anker, 2010 (7)
- Genus Vexillipar Chace, 1988 (1)
- Genus Yagerocaris Kensley, 1988 (1)
- Genus Zuzalpheus Ríos & Duffy, 2007 accepted as Synalpheus Spence Bate, 1888
- Family Barbouriidae Christoffersen, 1987 (10)
- Family Bythocarididae Christoffersen, 1987 (20)
- Family Hippolytidae Spence Bate, 1888 (106)
- Family Lysmatidae Dana, 1852 (57)
- Family Merguiidae Christoffersen, 1990 (2)
- Family Ogyrididae Holthuis, 1955 (13)
- Family Thoridae Kingsley, 1878 (199)
- Superfamily Atyoidea De Haan, 1849 (560)
- Superfamily Bresilioidea Calman, 1896 (70)
- Superfamily Campylonotoidea Sollaud, 1913 (17)
- Superfamily Caridea incertae sedis †
- Superfamily Crangonoidea Haworth, 1825 (329)
- Superfamily Nematocarcinoidea Smith, 1884 (80)
- Superfamily Oplophoroidea Dana, 1852 (71)
- Superfamily Palaemonoidea Rafinesque, 1815 (1 149)
- Superfamily Pandaloidea Haworth, 1825 (203)
- Superfamily Pasiphaeoidea Dana, 1852 (104)
- Superfamily Physetocaridoidea Chace, 1940 accepted as Pandaloidea Haworth, 1825
- Superfamily Pleopteryxoidea Schweigert & Garassino, 2006 †
- Superfamily Processoidea Ortmann, 1896 (70)
- Superfamily Psalidopodoidea Wood-Mason (3)
- Superfamily Stylodactyloidea Spence Bate, 1888 (34)
- Family Hectarthropidae Spence Bate, 1888 accepted as Processidae Ortmann, 1896
- Family Prionorhynchus Leach, 1830
- Genus Caricyphus Spence Bate, 1888
- Genus Rhomaleocaris Spence Bate, 1888
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Palaeopalaeomonida †
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Reptantia
- Suborder Trichelida