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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)
- Section Thaumastochelida accepted as Nephropidae Dana, 1852
- Superfamily Astacidea incertae sedis †
- Superfamily Astacoidea Latreille, 1802 (495)
- Family Astacidae Latreille, 1802 (21)
- Subfamily Nephropinae Dana, 1852 accepted as Nephropidae Dana, 1852
- Subfamily Pacifastacinae Starobogatov, 1996 accepted as Astacidae Latreille, 1802
- Genus Astacus Fabricius, 1775 (3)
- Subgenus Astacus (Cambaroides) Faxon, 1884 accepted as Cambaroides Faxon, 1884
- Subgenus Astacus (Cambarus) Erichson, 1846 accepted as Cambarus Erichson, 1846
- Subgenus Astacus (Cheraps) Erichson, 1846 accepted as Cherax Erichson, 1846
- Subgenus Astacus (Engaeus) Erichson, 1846 accepted as Engaeus Erichson, 1846
- Subgenus Astacus (Pontastacus) Bott, 1950 accepted as Pontastacus Bott, 1950
- Subgenus Astacus (Potamobius) Samoeulle, 1819 † accepted as Potamobius Samouelle, 1819
- Species Astacus advena Le Conte, 1855 accepted as Procambarus advena (Le Conte, 1855)
- Species Astacus affinis Say, 1817 accepted as Faxonius limosus (Rafinesque, 1817)
- Species Astacus albescens Pennant, 1812 accepted as Palaemon longirostris H. Milne Edwards, 1837
- Species Astacus angulosus Rathke, 1836 accepted as Pontastacus leptodactylus (Eschscholtz, 1823)
- Species Astacus angustatus Le Conte, 1855 accepted as Procambarus angustatus (Le Conte, 1855)
- Species Astacus armatus von Martens, 1866 accepted as Euastacus armatus (von Martens, 1866)
- Species Astacus astacus (Linnaeus, 1758)
- Species Astacus australasiensis H. Milne Edwards, 1837 accepted as Euastacus australasiensis (H. Milne Edwards, 1837)
- Species Astacus balcanicus (Karaman, 1929)
- Species Astacus bamffius Pennant, 1777 accepted as Munida rugosa (Fabricius, 1775)
- Species Astacus bartonii Fabricius, 1798 accepted as Cambarus bartonii bartonii (Fabricius, 1798)
- Species Astacus bicarinatus Gray in Eyre, 1845 accepted as Cherax bicarinatus (Gray in Eyre, 1845)
- Species Astacus bimaculatus Philippi, 1894 accepted as Samastacus spinifrons (Philippi, 1882)
- Species Astacus Birdii Bean, 1839 † accepted as Eryma birdi Woods, 1930 †
- Species Astacus Blandingii Harlan, 1830 accepted as Procambarus blandingii (Harlan, 1830)
- Species Astacus Brasiliensis von Martens, 1869 accepted as Parastacus brasiliensis (von Martens, 1869)
- Species Astacus breviforceps Cope, 1871 † accepted as Pacifastacus chenoderma (Cope, 1871) †
- Species Astacus caldwelli Spence Bate in Sclater, 1865 accepted as Astacoides caldwelli (Spence Bate in Sclater, 1865)
- Species Astacus carinatus Meuschen, 1778
- Species Astacus caspius Eichwald, 1838 accepted as Pontastacus pachypus (Rathke, 1836)
- Species Astacus cenomanensis Fritsch in Fritsch & Kafka, 1887 †
- Species Astacus chenoderma Cope, 1871 † accepted as Pacifastacus chenoderma (Cope, 1871) †
- Species Astacus chilensis H. Milne Edwards, 1837 accepted as Parastacus pugnax (Poeppig, 1835)
- Species Astacus ciliaris Rafinesque, 1817 accepted as Cambarus bartonii (Fabricius, 1798)
- Species Astacus coerulescens Fabricius, 1775 accepted as Hippolyte coerulescens (Fabricius, 1775)
- Species Astacus colchicus Kessler, 1876
- Species Astacus crassicornis Fabricius, 1775 accepted as Scina crassicornis (Fabricius, 1775)
- Species Astacus cylindrus Fabricius, 1793
- Species Astacus dauricus Pallas, 1772 accepted as Cambaroides dauricus (Pallas, 1772)
- Species Astacus edwardsii Van Straelen, 1928 † accepted as Emplastron edwardsii (Van Straelen, 1928) †
- Species Astacus elephas Fabricius, 1787 accepted as Palinurus elephas (Fabricius, 1787)
- Species Astacus europeus Couch, 1837 accepted as Homarus gammarus (Linnaeus, 1758)
- Species Astacus ferratus Fabricius, 1793
- Species Astacus fluviatilis Fabricius, 1775 accepted as Astacus astacus astacus (Linnaeus, 1758)
- Species Astacus fodiens Cottle, 1863 accepted as Creaserinus fodiens (Cottle, 1863)
- Species Astacus fontinalis Carbonnier, 1869 accepted as Austropotamobius pallipes (Lereboullet, 1858)
- Species Astacus fossarum Le Conte, 1855 accepted as Procambarus troglodytes (Le Conte, 1855)
- Species Astacus fossor Rafinesque, 1817 accepted as Cambarus diogenes Girard, 1852
- Species Astacus Franklinii Gray in Eyre, 1845 accepted as Astacopsis franklinii (Gray in Eyre, 1845)
- Species Astacus fulgens Fabricius, 1775
- Species Astacus fulvus Fabricius, 1793 accepted as Homarus capensis (Herbst, 1792)
- Species Astacus gambelii (Girard, 1852) accepted as Pacifastacus gambelii (Girard, 1852)
- Species Astacus gibbosus Pennant, 1812
- Species Astacus groenlandicus Fabricius, 1775 accepted as Lebbeus groenlandicus (Fabricius, 1775)
- Species Astacus harengum Fabricius, 1781 accepted as Praunus flexuosus (Müller, 1776)
- Species Astacus histrio Fabricius, 1775 accepted as Spirontocaris liljeborgii (Danielssen, 1859)
- Species Astacus homari Fabricius, 1779 accepted as Gammarellus homari (J.C. Fabricius, 1779)
- Species Astacus japonicus De Haan, 1841 accepted as Cambaroides japonicus (De Haan, 1841)
- Species Astacus kessleri Schimkewitsch, 1886 accepted as Pontastacus kessleri (Schimkewitsch, 1886)
- Species Astacus Klamathensis Stimpson, 1857 accepted as Pacifastacus leniusculus (Dana, 1852)
- Species Astacus laevissimus Fritsch in Fritsch & Kafka, 1887 †
- Species Astacus latimanus Le Conte, 1855 accepted as Cambarus latimanus (Le Conte, 1855)
- Species Astacus Leachii Mantell, 1822 † accepted as Enoploclytia leachii (Mantell, 1822) †
- Species Astacus leniusculus Dana, 1852 accepted as Pacifastacus leniusculus (Dana, 1852)
- Species Astacus leptodactylus Eschscholtz, 1823 accepted as Pontastacus leptodactylus (Eschscholtz, 1823)
- Species Astacus leptodactylus Germar, 1827 † accepted as Eryma modestiforme (von Schlotheim, 1822) †
- Species Astacus leptorhinus Fischer de Waldheim, 1836 accepted as Cambaroides dauricus (Pallas, 1772)
- Species Astacus leucoderma Pusch, 1838 † accepted as Eryma leucodermum (Pusch, 1838) †
- Species Astacus licenti Van Straelen, 1928 † accepted as Palaeocambarus licenti (Van Straelen, 1928) †
- Species Astacus limosus Rafinesque, 1817 accepted as Faxonius limosus (Rafinesque, 1817)
- Species Astacus locusta Fabricius, 1781 accepted as Leander tenuicornis (Say, 1818)
- Species Astacus longicornis Lereboullet, 1858 accepted as Austropotamobius torrentium torrentium (von Paula Schrank, 1803)
- Species Astacus longimanus Sowerby, 1826 † accepted as Hoploparia longimana (Sowerby, 1826) †
- Species Astacus maculatus Leach, 1814 accepted as Pandalus montagui Leach, 1814
- Species Astacus madagascarensis H. Milne Edwards & Audouin, 1839 accepted as Astacoides madagascarensis (H. Milne Edwards & Audouin, 1839)
- Species Astacus malabaricus Fabricius, 1775 accepted as Alpheus malabaricus (Fabricius, 1775)
- Species Astacus maniculatus Le Conte, 1855 accepted as Procambarus troglodytes (Le Conte, 1855)
- Species Astacus marinus Say, 1817 accepted as Homarus americanus H. Milne Edwards, 1837
- Species Astacus marinus Fabricius, 1775 accepted as Homarus gammarus (Linnaeus, 1758)
- Species Astacus mucronatus Phillips, 1835 † accepted as Pseudastacus mucronatus (Phillips, 1835) †
- Species Astacus multicavatus Bell, 1863 † accepted as Eryma multicavatus (Bell, 1863) †
- Species Astacus muricatus Olivier, 1791 accepted as Stenopus hispidus (Olivier, 1811)
- Species Astacus narual Fabricius, 1787 accepted as Plesionika narval (Fabricius, 1787)
- Species Astacus nasoscopus Meuschen, 1778 accepted as Atya innocous (Herbst, 1792)
- Species Astacus Nicoleti Philippi, 1882 accepted as Parastacus nicoleti (Philippi, 1882)
- Species Astacus nigrescens Stimpson, 1857 accepted as Pacifastacus nigrescens (Stimpson, 1857)
- Species Astacus oreganus Randall, 1840 accepted as Pacifastacus leniusculus (Dana, 1852)
- Species Astacus ornatus Phillips, 1829 † accepted as Meyeria ornata (Phillips, 1829) †
- Species Astacus pachypus Rathke, 1836 accepted as Pontastacus pachypus (Rathke, 1836)
- Subspecies Astacus pachypus lacustris Czerniavsky, 1884 accepted as Pontastacus pachypus (Rathke, 1836)
- Species Astacus pallipes Lereboullet, 1858 accepted as Austropotamobius pallipes (Lereboullet, 1858)
- Species Astacus pellucidus Tellkampf, 1844 accepted as Orconectes pellucidus (Tellkampf, 1844)
- Species Astacus penicillatus Olivier, 1791 accepted as Panulirus penicillatus (Olivier, 1791)
- Species Astacus penicillatus Le Conte, 1855 accepted as Procambarus barbatus (Faxon, 1890)
- Species Astacus pilimanus von Martens, 1869 accepted as Parastacus pilimanus (von Martens, 1869)
- Species Astacus planatus Fabricius, 1798
- Species Astacus politus Schlüter in von der Marck & Schlüter, 1868 † accepted as Protastacus politus (Schlüter in von der Marck & Schlüter, 1868) †
- Species Astacus pugnax Poeppig, 1835 accepted as Parastacus pugnax (Poeppig, 1835)
- Species Astacus pusillus Petagna, 1792 accepted as Upogebia pusilla (Petagna, 1792)
- Species Astacus pusillus Rafinesque, 1817 accepted as Cambarus bartonii (Fabricius, 1798)
- Species Astacus quadricarinatus von Martens, 1868 accepted as Cherax quadricarinatus (von Martens, 1868)
- Species Astacus quinquecarinatus Gray in Eyre, 1845 accepted as Cherax quinquecarinatus (Gray in Eyre, 1845)
- Species Astacus quinque-carinatus Gray in Eyre, 1845 accepted as Astacus quinquecarinatus Gray in Eyre, 1845
- Species Astacus rostratus Phillips, 1829 † accepted as Paraglyphea rostrata (Phillips, 1829) †
- Species Astacus rugosus Rafinesque, 1814 accepted as Nephrops norvegicus (Linnaeus, 1758)
- Species Astacus saxatilis Koch, 1836 accepted as Austropotamobius torrentium torrentium (von Paula Schrank, 1803)
- Species Astacus scaber Fabricius, 1798 accepted as Eutrichocheles modestus (Herbst, 1796)
- Species Astacus Schrenckii Kessler, 1874 accepted as Cambaroides schrenckii (Kessler, 1874)
- Species Astacus serratus Pennant, 1777 accepted as Palaemon serratus (Pennant, 1777)
- Species Astacus spiculifer Le Conte, 1855 accepted as Procambarus spiculifer (Le Conte, 1855)
- Species Astacus spinifrons Philippi, 1882 accepted as Samastacus spinifrons (Philippi, 1882)
- Species Astacus spinimanus Germar, 1827 † accepted as Cycleryon propinquus (von Schlotheim, 1822) †
- Species Astacus spinirostrius Imaizumi, 1938 † accepted as Palaeocambarus licenti (Van Straelen, 1928) †
- Species Astacus squilla (Linnaeus, 1758) accepted as Palaemon adspersus Rathke, 1836
- Species Astacus strigosus (Linnaeus, 1761) accepted as Galathea strigosa (Linnaeus, 1761)
- Species Astacus subgrundialis Cope, 1871 † accepted as Pacifastacus chenoderma (Cope, 1871) †
- Species Astacus Sussexiensis Mantell, 1833 † accepted as Palaeastacus sussexiensis (Mantell, 1833) †
- Species Astacus Tasmanicus Erichson, 1846 accepted as Geocharax tasmanicus (Erichson, 1846)
- Species Astacus tettigonus Fabricius, 1775
- Species Astacus torrentium (von Paula Schrank, 1803) accepted as Austropotamobius torrentium torrentium (von Paula Schrank, 1803)
- Species Astacus tristis Koch, 1836 accepted as Austropotamobius torrentium torrentium (von Paula Schrank, 1803)
- Species Astacus troglodytes Le Conte, 1855 accepted as Procambarus troglodytes (Le Conte, 1855)
- Species Astacus Trowbridgii Stimpson, 1857 accepted as Pacifastacus leniusculus (Dana, 1852)
- Species Astacus tyrrhenus Petagna, 1792 accepted as Gilvossius tyrrhenus (Petagna, 1792)
- Species Astacus zaleucus Thomson, 1873 accepted as Thaumastocheles zaleucus (Thomson, 1873)
- Species Astacus Zealandicus White, 1847 accepted as Paranephrops zealandicus (White, 1847)
- Genus Astacus Pallas, 1772 accepted as Cambaroides Faxon, 1884
- Genus Atlantoastacus Bott, 1950 accepted as Austropotamobius Skorikov, 1907
- Genus Austropotamobius Skorikov, 1907 (4)
- Genus Carabis Marchand, Lamy & de Boisvillette, 1874 accepted as Astacus Fabricius, 1775
- Genus Caspiastacus Starobogatov, 1996 accepted as Pontastacus Bott, 1950
- Genus Emplastron O'Flynn, Audo & Kawai, 2021 †
- Genus Pacifastacus Bott, 1950 (5)
- Genus Pontastacus Bott, 1950 (9)
- Genus Potamobius Samouelle, 1819 accepted as Astacus Fabricius, 1775
- Genus Pseudoastacus Vía, 1971 † accepted as Austropotamobius Skorikov, 1907
- Family Austroastacidae Clark, 1936 accepted as Parastacidae Huxley, 1879
- Family Cambaridae Hobbs, 1942 (468)
- Family Cambaroididae Villalobos, 1955 (6)
- Family Cricoidoscelosidae Taylor, Schram & Shen, 1999 † accepted as Cambaroididae Villalobos, 1955
- Family Euastacidae Riek, 1959 accepted as Parastacidae Huxley, 1879
- Family Potamobiidae Huxley, 1879 accepted as Astacidae Latreille, 1802
- Superfamily Enoplometopoidea de Saint Laurent, 1988 (11)
- Superfamily Nephropoidea Dana, 1852 (59)
- Superfamily Nepropoidea Dana, 1852 accepted as Nephropoidea Dana, 1852
- Superfamily Parastacoidea Huxley, 1879 (218)
- Superfamily Protastacoidea Albrecht, 1983 †
- Superfamily Stenochiroidea Beurlen, 1928 †
- 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