| Acanthephyridae Dana, 1852 | | 11 | Species | Taxom |
| Acanthotelsonidae | | 2 | Species | Taxom |
| Acetidae Vereshchaka, 2017 | | 1 | Species | Taxom |
| Aegeridae Burkenroad, 1963 | | 10 | Species | Taxom |
| Aeglidae Dana, 1852 | | 2 | Species | Taxom |
| Aenigmacarididae Schram & Horner, 1978 | | 2 | Species | Taxom |
| Aethridae Dana, 1851 | | 36 | Species | Taxom |
| Albuneidae Stimpson, 1858 | Mole crabs | 13 | Species | Taxom |
| Allocrangonyctidae Holsinger, 1989 | | 1 | Species | Taxom |
| Alpheidae Rafinesque, 1815 | Alpheid shrimp | 61 | Species | Taxom |
| Alvinocarididae Christoffersen, 1986 | | 2 | Species | Taxom |
| Amphisopodidae Nicholls, 1943 | | 2 | Species | Taxom |
| Anaspididae (Thomson, 1893) | Tasmanian anaspid crustaceans | 1 | Species | Taxom |
| Anthracocarididae Schram, 1979 | | 2 | Species | Taxom |
| Anthracophausiidae Brooks, 1962 | | 2 | Species | Taxom |
| Anthuridae Wägele, 1982 | | 1 | Species | Taxom |
| Aoridae Shoemaker, 1945 | | 2 | Species | Taxom |
| Archaeoniscidae Haack, 1918 | | 2 | Species | Taxom |
| Aristeidae Wood-Mason, 1891 | Gamba prawns | 6 | Species | Taxom |
| Armadillidae Brandt, 1831 | | 2 | Species | Taxom |
| Armadillidiidae Brandt, 1833 | Doodle bugs | 1 | Species | Taxom |
| Asellidae Latreille, 1802 | Freshwater Isopods | 1 | Species | Taxom |
| Astacidae Latreille, 1802 | Astacid crayfishes | 10 | Species | Taxom |
| Atelecyclidae Ortmann, 1893 | Horse crabs | 17 | Species | Taxom |
| Atyidae De Haan, 1849 | Atyid shrimps | 0 | Species | Taxom |
| Australomicroprotopidae Myers, Lowry..., 2016 | | 1 | Species | Taxom |
| Axiidae Huxley, 1879 | Lobster shrimps | 39 | Species | Taxom |
| Basinotopidae Karasawa, Sc..., 2011 | | 5 | Species | Taxom |
| Belotelsonidae Schram, 1974 | | 3 | Species | Taxom |
| Benthesicymidae Wood-Mason, 1891 | Benthesicymid shrimps | 10 | Species | Taxom |
| Blepharipodidae Boyko, 2002 | Spiny sand crabs | 5 | Species | Taxom |
| Bodotriidae T. Scott, 1901 | | 1 | Species | Taxom |
| Bopyridae Rafinesque, 1815 | | 1 | Species | Taxom |
| Bresiliidae Calman, 1896 | | 3 | Species | Taxom |
| Bucculentidae Schweitzer &..., 2009 | | 3 | Species | Taxom |
| Calappidae Milne-Edwards, 1837 | Box Crab | 88 | Species | Taxom |
| Callianassidae Dana, 1852 | Burrowing Ghost Shrimps | 287 | Species | Taxom |
| Callianideidae Kossmann, 1880 | | 1 | Species | Taxom |
| Camarocarcinidae Feldmann & al., 2007 | | 4 | Species | Taxom |
| Cambaridae Hobbs, 1942 | Cambarid crayfishes | 3 | Species | Taxom |
| Camptandriidae Stimpson, 1858 | | 1 | Species | Taxom |
| Canadasipididae Novožilov, 1960 | | 2 | Species | Taxom |
| Cancridae Latreille, 1802 | Edible crabs | 109 | Species | Taxom |
| Cancrinidae Beurlen, 1930 | | 3 | Species | Taxom |
| Caprellidae Leach, 1814 | Ghost shrimps | 1 | Species | Taxom |
| Carcineretidae Beurlen, 1930 | | 6 | Species | Taxom |
| Carcinidae (MacLeay, 1838) | Swimming crabs | 2 | Species | Taxom |
| Carinocarcinoididae | | 4 | Species | Taxom |
| Carpiliidae Ortmann, 1893 | Coral crabs | 41 | Species | Taxom |
| Carpopenaeidae Garassino, 1994 | | 3 | Species | Taxom |
| Caryocarididae Racheboeuf, ..., 2000 | | 1 | Species | Taxom |
| Cenomanocarcinidae Guinot & al., 2008 | | 16 | Species | Taxom |
| Ceratiocarididae Salter, 1860 | | 3 | Species | Taxom |
| Chasmocarcinidae Serène, 1964 | | 12 | Species | Taxom |
| Cheiragonidae Ortmann, 1893 | Helmet crabs | 13 | Species | Taxom |
| Chilenophoberidae Tshudy & Bab..., 1997 | | 2 | Species | Taxom |
| Chimaerastacidae Amati, Feldm..., 2004 | | 1 | Species | Taxom |
| Chirostylidae Ortmann, 1892 | | 32 | Species | Taxom |
| Chlorotocellidae Komai, Chan ..., 2019 | | 2 | Species | Taxom |
| Cirolanidae Dana, 1852 | Cave Isopods | 5 | Species | Taxom |
| Clytiopsidae Beurlen, 1927 | | 1 | Species | Taxom |
| Coenobitidae Dana, 1851 | Land hermit crabs | 3 | Species | Taxom |
| Coleiidae Van Straelen, 1924 | | 28 | Species | Taxom |
| Componocancridae Feldmann & S..., 2008 | | 1 | Species | Taxom |
| Corystidae Samouelle, 1819 | | 8 | Species | Taxom |
| Crangonidae Haworth, 1825 | Crangonid Shrimp | 18 | Species | Taxom |
| Crangonyctidae Bousfield, 1973 | Gammarid amphipods | 1 | Species | Taxom |
| Cyclodorippidae Ortmann, 1892 | | 12 | Species | Taxom |
| Cymonomidae Bouvier, 1897 | | 4 | Species | Taxom |
| Cymothoidae Leach, 1818 | Fish Doctors | 1 | Species | Taxom |
| Dairidae Ng & Rodriguez, 1986 | | 9 | Species | Taxom |
| Dakoticancridae Rathbun, 1917 | | 9 | Species | Taxom |
| Dexaminidae Leach, 1814 | | 2 | Species | Taxom |
| Diaulacidae Wright & Col..., 1972 | | 6 | Species | Taxom |
| Diogenidae Ortmann, 1892 | Left-handed hermit crabs | 91 | Species | Taxom |
| Disciadidae Rathbun, 1902 | | 1 | Species | Taxom |
| Domeciidae Ortmann, 1893 | | 3 | Species | Taxom |
| Dorippidae MacLeay, 1838 | Demon-faced crabs | 31 | Species | Taxom |
| Dromiidae De Haan, 1833 | Sponge crabs | 82 | Species | Taxom |
| Dynomenidae Ortmann, 1892 | | 31 | Species | Taxom |
| Enoplometopidae de Saint Lau..., 1988 | Reef lobsters | 1 | Species | Taxom |
| Eocarcinidae Withers, 1932 | | 1 | Species | Taxom |
| Epialtidae MacLeay, 1838 | Kelp Crabs | 33 | Species | Taxom |
| Erymidae Van Straelen, 1924 | | 142 | Species | Taxom |
| Eryonidae De Haan, 1841 | | 23 | Species | Taxom |
| Eucopiidae Sars, 1885 | | 2 | Species | Taxom |
| Eumunididae A. Milne Edw..., 1900 | | 2 | Species | Taxom |
| Euryplacidae Stimpson, 1871 | | 13 | Species | Taxom |
| Feldmanniidae Schweitzer &..., 2012 | | 1 | Species | Taxom |
| Galatheidae Samouelle, 1819 | Squat lobsters | 103 | Species | Taxom |
| Galenidae Alcock, 1898 | | 6 | Species | Taxom |
| Gammaridae Leach, 1813 | Gammarids | 4 | Species | Taxom |
| Gecarcinidae MacLeay, 1838 | Land crabs | 3 | Species | Taxom |
| Geryonidae Colosi, 1923 | Deepsea crabs | 13 | Species | Taxom |
| Glaessneropsidae Patrulius, 1959 | | 19 | Species | Taxom |
| Glypheidae Zittel, 1885 | | 95 | Species | Taxom |
| Glyphocrangonidae Smith, 1884 | Armored shrimp | 2 | Species | Taxom |
| Gnathiidae Leach, 1814 | | 5 | Species | Taxom |
| Goneplacidae MacLeay, 1838 | Angular crabs | 46 | Species | Taxom |
| Goniocypodidae | | 1 | Species | Taxom |
| Goniodromitidae Beurlen, 1932 | | 68 | Species | Taxom |
| Gorgonophontidae Schram, 2007 | | 1 | Species | Taxom |
| Grapsidae MacLeay, 1838 | Marsh crabs | 8 | Species | Taxom |
| Hapalogastridae Brandt, 1850 | | 1 | Species | Taxom |
| Haustoriidae Stebbing, 1906 | | 1 | Species | Taxom |
| Hepatidae Stimpson, 1871 | | 14 | Species | Taxom |
| Hexapodidae Miers, 1886 | | 21 | Species | Taxom |
| Hippidae Latreille, 1825 | Mole Crabs | 4 | Species | Taxom |
| Hippolytidae Dana, 1852 | Anemone shrimp | 20 | Species | Taxom |
| Holognathidae G. Thomson, 1904 | | 1 | Species | Taxom |
| Homolidae De Haan, 1839 | Carrier crabs | 73 | Species | Taxom |
| Homolodromiidae Alcock, 1899 | | 16 | Species | Taxom |
| Hymenocarididae Haeckel, 1896 | | 2 | Species | Taxom |
| Hypothalassiidae Karasawa & S..., 2006 | Champagne crabs | 1 | Species | Taxom |
| Ibericancridae Artal & Guin..., 2008 | | 1 | Species | Taxom |
| Idoteidae Samouelle, 1819 | | 2 | Species | Taxom |
| Inachidae MacLeay, 1838 | | 27 | Species | Taxom |
| Inachoididae Dana, 1851 | | 4 | Species | Taxom |
| Ischyroceridae Stebbing, 1899 | | 1 | Species | Taxom |
| Janiridae Sars, 1897 | | 1 | Species | Taxom |
| Jerometichenoriidae Schram, 1978 | | 1 | Species | Taxom |
| Jurapseudidae Schram, Sieg..., 1986 | | 1 | Species | Taxom |
| Kallidecthidae Schram, 1969 | | 0 | Species | Taxom |
| Konidromitidae | | 5 | Species | Taxom |
| Laomediidae Borradaile, 1903 | | 7 | Species | Taxom |
| Latreilliidae Stimpson, 1858 | Longleg crabs | 5 | Species | Taxom |
| Lecythocaridae Schweitzer &..., 2009 | | 4 | Species | Taxom |
| Leucosiidae Samouelle, 1819 | Nut crabs | 176 | Species | Taxom |
| Leucothoidae Dana, 1852 | | 1 | Species | Taxom |
| Ligiidae Leach, 1814 | Rock lice | 2 | Species | Taxom |
| Liljeborgiidae Stebbing, 1899 | | 1 | Species | Taxom |
| Lipkiidae Burukovsky, 2012 | | 1 | Species | Taxom |
| Lithodidae Samouelle, 1819 | King crab | 7 | Species | Taxom |
| Lithodidea Stimpson, 1862 | | 1 | Species | Taxom |
| Lithophylacidae Straelen, 1936 | | 1 | Species | Taxom |
| Litocheiridae ?tev?i?, 2005 | | 6 | Species | Taxom |
| Litogastroidae (Karasawa, Sc..., 2013) | | 3 | Species | Taxom |
| Lomisidae Bouvier, 1895 | | 1 | Species | Taxom |
| Longodromitidae Schweitzer &..., 2009 | | 43 | Species | Taxom |
| Longusorbiidae Karasawa, Sc..., 2008 | | 5 | Species | Taxom |
| Lophogastridae Sars, 1870 | | 1 | Species | Taxom |
| Luciferidae De Haan, 1849 | | 2 | Species | Taxom |
| Lysianassidae Dana, 1849 | | 4 | Species | Taxom |
| Macrocheiridae Dana, 1851 | | 4 | Species | Taxom |
| Macrophthalmidae Dana, 1851 | | 13 | Species | Taxom |
| Macropipidae Rafinesque, 1815 | Swimming crabs | 2 | Species | Taxom |
| Majidae Samouelle, 1819 | Spider crab | 115 | Species | Taxom |
| Marocarcinidae Guinot, De A..., 2008 | | 1 | Species | Taxom |
| Martinocarcinidae | | 1 | Species | Taxom |
| Mathildellidae Karasawa & Kato, 2003 | | 34 | Species | Taxom |
| Matutidae De Haan, 1835 | | 7 | Species | Taxom |
| Mecochiridae Van Straelen, 1924 | | 51 | Species | Taxom |
| Menippidae Ortmann, 1893 | Stone crabs | 16 | Species | Taxom |
| Micheleidae Sakai, 1992 | | 3 | Species | Taxom |
| Mithracidae Balss, 1929 | | 17 | Species | Taxom |
| Mithracitidae Stevcic, 2005 | | 2 | Species | Taxom |
| Munididae Ahyong, Baba..., 2010 | | 31 | Species | Taxom |
| Munidopsidae Whiteaves, 1874 | | 40 | Species | Taxom |
| Mysidae Haworth, 1825 | | 2 | Species | Taxom |
| Nannastacidae Spence Bate, 1866 | | 2 | Species | Taxom |
| Necrocarcinidae Föster, 1968 | | 46 | Species | Taxom |
| Nematocarcinidae Smith, 1884 | | 3 | Species | Taxom |
| Nephropidae Dana, 1852 | Clawed Lobster | 159 | Species | Taxom |
| Niphargidae Bousfield, 1977 | | 2 | Species | Taxom |
| Nodoprosopidae Schweitzer &..., 2009 | | 8 | Species | Taxom |
| Ocypodidae Rafinesque, 1815 | Fiddler crabs | 28 | Species | Taxom |
| Oedicerotidae Lilljeborg, 1865 | | 1 | Species | Taxom |
| Ogyrididae Holthuis, 1955 | Long-eyed shrimps | 2 | Species | Taxom |
| Ohiocarididae Rolfe, 1962 | | 1 | Species | Taxom |
| Oniscidae Latreille, 1802 | Sow Bugs | 2 | Species | Taxom |
| Oplophoridae Dana, 1852 | Deepsea shrimps | 9 | Species | Taxom |
| Oregoniidae Garth, 1958 | | 29 | Species | Taxom |
| Orithopsidae Schweitzer, ..., 2003 | | 10 | Species | Taxom |
| Orithyiidae Dana, 1853 | | 1 | Species | Taxom |
| Oziidae Dana, 1851 | | 1 | Species | Taxom |
| Paguridae Latreille, 1802 | Hermit Crabs | 87 | Species | Taxom |
| Palaemonidae Rafinesque, 1815 | Palaemonid Shrimps | 72 | Species | Taxom |
| Palaeocarididae Meek & Worthen, 1865 | | 2 | Species | Taxom |
| Palaeocorystidae Lorenthey & ..., 1929 | | 10 | Species | Taxom |
| Palaeopemphidae Feldmann, Ga..., 2004 | | 3 | Species | Taxom |
| Palaeopentachelidae | | 2 | Species | Taxom |
| Palaeophreatoicidae Birshtein, 1962 | | 2 | Species | Taxom |
| Palaeoxanthopsidae Schweitzer, 2003 | | 2 | Species | Taxom |
| Paleoxanthopsidae Schweitzer, 2003 | | 11 | Species | Taxom |
| Palicidae Bouvier, 1898 | Stilt crabs | 6 | Species | Taxom |
| Palinuridae Latreille, 1802 | Crawfish | 68 | Species | Taxom |
| Pallaseidae Tachteew, 2000 | | 0 | Species | Taxom |
| Pandalidae Haworth, 1825 | Pandalid shrimp | 13 | Species | Taxom |
| Panopeidae Ortmann, 1893 | Mud crabs | 79 | Species | Taxom |
| Parabathynellidae Cho, 1996 | | 1 | Species | Taxom |
| Parapaguridae S. I. Smith, 1882 | Deepwater hermit crabs | 13 | Species | Taxom |
| Parapylochelidae Fraaije, Klo..., 2012 | | 1 | Species | Taxom |
| Parascelidae Bovallius, 1887 | | 1 | Species | Taxom |
| Parastacidae Huxley, 1879 | | 6 | Species | Taxom |
| Parthenopidae MacLeay, 1838 | Elbow crabs | 55 | Species | Taxom |
| Pasiphaeidae Dana, 1852 | Glass shrimps | 13 | Species | Taxom |
| Peachocarididae Schram, 1986 | | 0 | Species | Taxom |
| Pemphicidae Van Straelen, 1928 | | 8 | Species | Taxom |
| Penaeidae Rafinesque, 1815 | Penaeid shrimps | 58 | Species | Taxom |
| Pephricarididae Van Straelen, 1933 | | 1 | Species | Taxom |
| Perspicarididae Briggs, 1978 | | 5 | Species | Taxom |
| Petalidiumidae Vereshchaka, 2017 | | 1 | Species | Taxom |
| Philosciidae Kinahan, 1857 | Woodlice | 3 | Species | Taxom |
| Phoxocephalidae Sars, 1891 | | 1 | Species | Taxom |
| Physetocarididae Chace, 1940 | | 1 | Species | Taxom |
| Pilumnidae Samouelle, 1819 | | 64 | Species | Taxom |
| Pinnotheridae De Haan, 1833 | Commensal Crabs | 21 | Species | Taxom |
| Pirimelidae Alcock, 1899 | | 5 | Species | Taxom |
| Platyarthridae Verhoeff, 1949 | Woodlice | 2 | Species | Taxom |
| Platychelidae Glaessner, 1969 | | 4 | Species | Taxom |
| Platykottidae Chablais, Fe..., 2011 | | 1 | Species | Taxom |
| Pleopteryxidae Schweigert &..., 2006 | | 1 | Species | Taxom |
| Polychelidae Wood-Mason, 1874 | Blind lobsters | 14 | Species | Taxom |
| Pontogammaridae Bousfield, 1977 | | 0 | Species | Taxom |
| Porcellanidae Haworth, 1825 | Porcelain crab | 38 | Species | Taxom |
| Porcellionidae Brandt & Rat..., 1831 | Woodlice | 3 | Species | Taxom |
| Portunidae Rafinesque, 1815 | Swimming Crab | 273 | Species | Taxom |
| Potamidae Ortmann, 1896 | | 9 | Species | Taxom |
| Potamonautidae Bott, 1970 | | 3 | Species | Taxom |
| Poupiniidae Guinot, 1991 | | 2 | Species | Taxom |
| Priscinachidae | | 1 | Species | Taxom |
| Processidae Ortmann, 1896 | Night shrimps | 5 | Species | Taxom |
| Prosopidae von Meyer, 1860 | | 28 | Species | Taxom |
| Protastacidae Albrecht, 1983 | | 1 | Species | Taxom |
| Psammocarcinidae | | 2 | Species | Taxom |
| Pseudarmadillidae Vandel, 1973 | | 2 | Species | Taxom |
| Pseudocarcinidae Ng & Davie, 2020 | | 1 | Species | Taxom |
| Pseudorhombilidae Alcock, 1900 | | 5 | Species | Taxom |
| Pseudoziidae Alcock, 1898 | | 11 | Species | Taxom |
| Pylochelidae Bate, 1888 | | 2 | Species | Taxom |
| Raninidae De Haan, 1839 | Frog crabs | 230 | Species | Taxom |
| Retroplumidae Gill, 1894 | | 28 | Species | Taxom |
| Retrorsichelidae Feldmann, Ts..., 1993 | | 1 | Species | Taxom |
| Rhabdouraeidae Schram & Mal..., 1984 | | 1 | Species | Taxom |
| Rhinocarididae Hall & Clarke, 1888 | | 2 | Species | Taxom |
| Rhynchocinetidae Ortmann, 1890 | Hingebeak shrimp | 5 | Species | Taxom |
| Sairocarididae Schram, 1973 | | 3 | Species | Taxom |
| Schobertellidae | | 3 | Species | Taxom |
| Sculdidae Dames, 1886 | | 2 | Species | Taxom |
| Scyllaridae Latreille, 1825 | Shovel-nosed lobsters | 47 | Species | Taxom |
| Sergestidae Dana, 1852 | | 13 | Species | Taxom |
| Serolidae Dana, 1852 | | 2 | Species | Taxom |
| Sesarmidae Dana, 1851 | | 4 | Species | Taxom |
| Sicyoniidae Ortmann, 1898 | Rock shrimps | 3 | Species | Taxom |
| Solenoceridae Wood-Mason, 1891 | Solenocerid shrimps | 6 | Species | Taxom |
| Spelaeogriphidae Gordon, 1957 | | 1 | Species | Taxom |
| Sphaerodromiidae Guinot & Tav..., 2003 | | 1 | Species | Taxom |
| Sphaeromatidae Latreille, 1825 | | 3 | Species | Taxom |
| Spongicolidae von Martens, 1872 | Glass sponge shrimps | 2 | Species | Taxom |
| Squillidae Latreille, 1802 | Squillid mantis shrimps | 5 | Species | Taxom |
| Stenochiridae | | 15 | Species | Taxom |
| Stenopodidae Risso, 1826 | Coral shrimps | 3 | Species | Taxom |
| Stenothoidae Boeck, 1871 | | 1 | Species | Taxom |
| Strahlaxiidae Poore, 1994 | | 2 | Species | Taxom |
| Stylodactylidae Bate, 1888 | | 1 | Species | Taxom |
| Tanaidae Dana, 1849 | | 1 | Species | Taxom |
| Tanidromitidae Schweitzer &..., 2007 | | 15 | Species | Taxom |
| Tealliocarididae Brooks, 1962 | | 2 | Species | Taxom |
| Tetrachelidae BemIen, 1930 | | 1 | Species | Taxom |
| Tetraliidae Castro, Ng &..., 2004 | | 3 | Species | Taxom |
| Thalassinidae Latreille, 1831 | Mud lobsters | 5 | Species | Taxom |
| Thiidae Dana, 1852 | | 2 | Species | Taxom |
| Thoridae Kingsley, 1878 | Anemone shrimp | 4 | Species | Taxom |
| Tithonohomolidae | | 4 | Species | Taxom |
| Trapeziidae Miers, 1886 | Coral crabs | 13 | Species | Taxom |
| Tricarinidae Feldmann & al., 2007 | | 1 | Species | Taxom |
| Trichodactylidae H. Milne-Edw..., 1835 | | 1 | Species | Taxom |
| Trichoniscidae G. O. Sars, 1899 | Woodlice | 4 | Species | Taxom |
| Tumidocarcinidae Schweitzer, 2005 | | 54 | Species | Taxom |
| Tychidae (Dana, 1851) | Urn crabs | 1 | Species | Taxom |
| Tylocarididae Taylor, Shen..., 1998 | | 2 | Species | Taxom |
| Tyrannophontidae Schram, 1984 | | 1 | Species | Taxom |
| Udorellidae | | 1 | Species | Taxom |
| Uncinidae Beurlen, 1928 | | 5 | Species | Taxom |
| Upogebiidae Borradaile, 1903 | Mud shrimp | 35 | Species | Taxom |
| Urdidae Kunth, 1870 | | 1 | Species | Taxom |
| Uronectidae Cockerell, 1916 | | 2 | Species | Taxom |
| Varunidae H. Milne-Edw..., 1853 | | 25 | Species | Taxom |
| Venipaguridae Collins, 2011 | | 1 | Species | Taxom |
| Waterstonellidae Schram, 1979 | | 1 | Species | Taxom |
| Xanthidae MacLeay, 1838 | Mud crabs | 161 | Species | Taxom |
| Xenophthalmidae Stimpson, 1858 | | 1 | Species | Taxom |
| Zanthopsidae Vía, 1959 | | 51 | Species | Taxom |