| Acanthaspidiidae Just, 2001 | | 4 | Arten | Taxom |
| Acanthephyridae Dana, 1852 | | 9 | Arten | Taxom |
| Acanthogammaridae Garjajeff, 1901 | | 9 | Arten | Taxom |
| Acetidae Vereshchaka, 2017 | | 1 | Art | Taxom |
| Aegidae White, 1850 | | 24 | Arten | Taxom |
| Aeglidae Dana, 1852 | | 3 | Arten | Taxom |
| Aethridae Dana, 1851 | | 1 | Art | Taxom |
| Agathotanaidae Lang, 1971 | | 4 | Arten | Taxom |
| Akanthophoreidae Sieg, 1986 | | 9 | Arten | Taxom |
| Albuneidae Stimpson, 1858 | Maulwurfskrabben | 6 | Arten | Taxom |
| Allocrangonyctidae Holsinger, 1989 | | 2 | Arten | Taxom |
| Alloniscidae Schmidt, 2003 | | 1 | Art | Taxom |
| Alpheidae Rafinesque, 1815 | Knallkrebschen | 37 | Arten | Taxom |
| Alvinocarididae Christoffersen, 1986 | | 1 | Art | Taxom |
| Amaryllididae Lowry & Stod..., 2002 | | 2 | Arten | Taxom |
| Amathillopsidae Pirlot, 1934 | | 3 | Arten | Taxom |
| Ampeliscidae Costa, 1857 | | 55 | Arten | Taxom |
| Amphilochidae Boeck, 1871 | | 35 | Arten | Taxom |
| Amphionididae Holthuis, 1955 | | 0 | Arten | Taxom |
| Ampithoidae J. L. Barnard, 1965 | | 18 | Arten | Taxom |
| Anarthruridae Lang, 1971 | | 6 | Arten | Taxom |
| Anaspididae (Thomson, 1893) | | 3 | Arten | Taxom |
| Antarcturidae Kussakin & V..., 1998 | | 8 | Arten | Taxom |
| Anthuridae Wägele, 1982 | | 10 | Arten | Taxom |
| Anuropidae Stebbing, 1893 | | 0 | Arten | Taxom |
| Aoridae Shoemaker, 1945 | | 47 | Arten | Taxom |
| Apseudidae Leach, 1814 | | 19 | Arten | Taxom |
| Arcitalitridae Myers & Lowry, 2020 | | 1 | Art | Taxom |
| Arcturidae Dana, 1849 | | 30 | Arten | Taxom |
| Arcturididae Poore, 2001 | | 1 | Art | Taxom |
| Argissidae Walker, 1904 | | 2 | Arten | Taxom |
| Aristeidae Wood-Mason, 1891 | | 2 | Arten | Taxom |
| Aristiidae Lowry & Stod..., 1997 | | 11 | Arten | Taxom |
| Armadillidae Brandt, 1831 | | 11 | Arten | Taxom |
| Armadillidiidae Brandt, 1833 | Kugelasseln | 26 | Arten | Taxom |
| Asconiscidae Bonnier, 1900 | | 1 | Art | Taxom |
| Asellidae Latreille, 1802 | Wasserasseln | 13 | Arten | Taxom |
| Astacidae Latreille, 1802 | | 11 | Arten | Taxom |
| Atelecyclidae Ortmann, 1893 | Kreiskrabben | 8 | Arten | Taxom |
| Atyidae De Haan, 1849 | Fächergarnelen | 39 | Arten | Taxom |
| Atylidae Lilljeborg, 1865 | | 27 | Arten | Taxom |
| Austrarcturellidae Poore & Bard..., 1992 | | 1 | Art | Taxom |
| Axiidae Huxley, 1879 | Schlammkrebse | 10 | Arten | Taxom |
| Baikalogammaridae Kamaltynov, 2001 | | 1 | Art | Taxom |
| Bathynellidae Pennak & Ward, 1985 | | 0 | Arten | Taxom |
| Bathytropidae Vandel, 1952 | | 1 | Art | Taxom |
| Behningiellidae Kamaltynov, 2001 | | 1 | Art | Taxom |
| Belliidae Dana, 1852 | | 3 | Arten | Taxom |
| Bentheuphausiidae Colosi, 1917 | | 1 | Art | Taxom |
| Blepharipodidae Boyko, 2002 | | 1 | Art | Taxom |
| Bodotriidae T. Scott, 1901 | | 25 | Arten | Taxom |
| Bopyridae Rafinesque, 1815 | | 36 | Arten | Taxom |
| Buddelundiellidae (G. O. Sars, 1899) | | 1 | Art | Taxom |
| Bythocarididae Christoffersen, 1987 | | 15 | Arten | Taxom |
| Cabiropidae Giard & Bonnier, 1887 | | 7 | Arten | Taxom |
| Calappidae Milne-Edwards, 1837 | Boxerkrabben | 16 | Arten | Taxom |
| Callianassidae Dana, 1852 | | 15 | Arten | Taxom |
| Calliopiidae G. O. Sars, 1895 | | 58 | Arten | Taxom |
| Camarocarcinidae Feldmann & al., 2007 | | 1 | Art | Taxom |
| Cambaridae Hobbs, 1942 | | 128 | Arten | Taxom |
| Cancridae Latreille, 1802 | Felsenkrabben | 41 | Arten | Taxom |
| Caprellidae Leach, 1814 | Gespensterkrebse | 41 | Arten | Taxom |
| Caprogammaridae Kudrjaschov ..., 1966 | | 1 | Art | Taxom |
| Carangoliopsidae Bousfield, 1977 | | 1 | Art | Taxom |
| Cardenioidae Barnard & Ka..., 1987 | | 1 | Art | Taxom |
| Carpiliidae Ortmann, 1893 | | 3 | Arten | Taxom |
| Caryocarididae Racheboeuf, ..., 2000 | | 0 | Arten | Taxom |
| Ceratiocarididae Salter, 1860 | | 1 | Art | Taxom |
| Chaetiliidae Dana, 1849 | | 9 | Arten | Taxom |
| Chasmocarcinidae Serène, 1964 | | 1 | Art | Taxom |
| Cheiragonidae Ortmann, 1893 | | 0 | Arten | Taxom |
| Cheirocratidae Ren, 2006 | | 1 | Art | Taxom |
| Cheluridae Allman, 1847 | | 1 | Art | Taxom |
| Chirostylidae Ortmann, 1892 | | 13 | Arten | Taxom |
| Chlorotocellidae Komai, Chan ..., 2019 | | 1 | Art | Taxom |
| Cirolanidae Dana, 1852 | Riesenasseln | 32 | Arten | Taxom |
| Coenobitidae Dana, 1851 | Landeinsiedlerkrebse | 7 | Arten | Taxom |
| Colletteidae Larsen & Wilson, 2002 | | 7 | Arten | Taxom |
| Colomastigidae Stebbing, 1899 | | 1 | Art | Taxom |
| Componocancridae Feldmann & S..., 2008 | | 1 | Art | Taxom |
| Conicostomatidae Lowry & Stod..., 2012 | | 1 | Art | Taxom |
| Coralaxiidae Sakai & de S..., 1989 | | 1 | Art | Taxom |
| Corophiidae Leach, 1814 | | 48 | Arten | Taxom |
| Corystidae Samouelle, 1819 | Helmkrabben | 3 | Arten | Taxom |
| Crangonidae Haworth, 1825 | Sandgarnelen | 46 | Arten | Taxom |
| Crangonyctidae Bousfield, 1973 | | 14 | Arten | Taxom |
| Cressidae Stebbing, 1899 | | 7 | Arten | Taxom |
| Cryptochiridae Paulson, 1875 | Gallkrabben | 1 | Art | Taxom |
| Cryptoniscidae Kossmann, 1880 | | 4 | Arten | Taxom |
| Crypturopodidae Kamaltynov, 2002 | | 5 | Arten | Taxom |
| Cyamidae Rafinesque, 1815 | | 11 | Arten | Taxom |
| Cyclodorippidae Ortmann, 1892 | | 3 | Arten | Taxom |
| Cylisticidae Verhoeff, 1949 | | 1 | Art | Taxom |
| Cyllopodidae Bovallius, 1887 | | 2 | Arten | Taxom |
| Cymothoidae Leach, 1818 | | 27 | Arten | Taxom |
| Cyphocarididae Lowry & Stod..., 1997 | | 3 | Arten | Taxom |
| Cyproideidae J. L. Barnard, 1974 | | 4 | Arten | Taxom |
| Cyproniscidae Giard & Bonnier, 1887 | | 1 | Art | Taxom |
| Dairidae Ng & Rodriguez, 1986 | | 1 | Art | Taxom |
| Dajidae Giard & Bonnier, 1887 | | 13 | Arten | Taxom |
| Dendrotiidae (Vanhöffen, 1914) | | 2 | Arten | Taxom |
| Dendrotionidae (Cohen, 1998) | | 1 | Art | Taxom |
| Desmocarididae Borradaile, 1915 | | 1 | Art | Taxom |
| Desmosomatidae Brix, 2006 | | 33 | Arten | Taxom |
| Dexaminidae Leach, 1814 | | 9 | Arten | Taxom |
| Diastylidae Bate, 1856 | | 55 | Arten | Taxom |
| Diogenidae Ortmann, 1892 | Linkshändige Einsiedlerkrebse | 39 | Arten | Taxom |
| Disciadidae Rathbun, 1902 | | 1 | Art | Taxom |
| Dogielinotidae Gurjanova, 1953 | | 0 | Arten | Taxom |
| Dorippidae MacLeay, 1838 | Gepäckträgerkrabben | 10 | Arten | Taxom |
| Dromiidae De Haan, 1833 | Schwammkrabben | 20 | Arten | Taxom |
| Endevouridae Lowry & Stod..., 1997 | | 1 | Art | Taxom |
| Entoniscidae Kossmann, 1881 | | 5 | Arten | Taxom |
| Eophliantidae Sheard, 1936 | | 2 | Arten | Taxom |
| Epialtidae MacLeay, 1838 | | 36 | Arten | Taxom |
| Epimeriidae Boeck, 1871 | | 18 | Arten | Taxom |
| Eriopisidae Lowry & Myers, 2013 | | 1 | Art | Taxom |
| Eriphiidae MacLeay, 1838 | Haarkrabben | 1 | Art | Taxom |
| Erymidae Van Straelen, 1924 | | 0 | Arten | Taxom |
| Etyidae Guinot & Tav..., 2001 | | 1 | Art | Taxom |
| Eucopiidae Sars, 1885 | | 2 | Arten | Taxom |
| Eulimnogammaridae Kamaltynov, 1999 | | 12 | Arten | Taxom |
| Eumunididae A. Milne Edw..., 1900 | | 1 | Art | Taxom |
| Euphausiidae Milne-Edwards, 1837 | Euphausiden | 64 | Arten | Taxom |
| Eurypodiidae MacLeay, 1838 | | 1 | Art | Taxom |
| Euryrhynchidae Holthuis, 1950 | | 1 | Art | Taxom |
| Eurytheneidae Stoddart & L..., 2004 | | 0 | Arten | Taxom |
| Eusiridae Stebbing, 1888 | | 52 | Arten | Taxom |
| Expanathuridae Nunomura, 1984 | | 1 | Art | Taxom |
| Feldmanniidae Schweitzer &..., 2012 | | 1 | Art | Taxom |
| Galatheidae Samouelle, 1819 | Springkrebse | 27 | Arten | Taxom |
| Galenidae Alcock, 1898 | | 1 | Art | Taxom |
| Gammaracanthidae Bousfield, 1989 | | 4 | Arten | Taxom |
| Gammarellidae Bousfield, 1977 | | 5 | Arten | Taxom |
| Gammaridae Leach, 1813 | Flohkrebse | 164 | Arten | Taxom |
| Gecarcinidae MacLeay, 1838 | Landkrabben | 4 | Arten | Taxom |
| Gecarcinucidae Rathbun, 1904 | | 1 | Art | Taxom |
| Geryonidae Colosi, 1923 | Tiefseekrabben | 8 | Arten | Taxom |
| Glyphocrangonidae Smith, 1884 | | 1 | Art | Taxom |
| Gnathiidae Leach, 1814 | | 31 | Arten | Taxom |
| Gnathophausiidae Udrescu, 1984 | | 3 | Arten | Taxom |
| Goneplacidae MacLeay, 1838 | Rhombenkrabben | 7 | Arten | Taxom |
| Gonodactylidae Giesbrecht, 1910 | | 5 | Arten | Taxom |
| Grapsidae MacLeay, 1838 | Felsenkrabben | 16 | Arten | Taxom |
| Gynodiastylidae Stebbing, 1912 | | 18 | Arten | Taxom |
| Hadziidae Karaman, 1943 | | 1 | Art | Taxom |
| Halophilosciidae Verhoeff, 1908 | | 1 | Art | Taxom |
| Hapalogastridae Brandt, 1850 | | 1 | Art | Taxom |
| Haploniscidae Hansen, 1916 | | 5 | Arten | Taxom |
| Haustoriidae Stebbing, 1906 | | 10 | Arten | Taxom |
| Hemisquillidae Manning, 1980 | | 1 | Art | Taxom |
| Hepatidae Stimpson, 1871 | | 1 | Art | Taxom |
| Hippidae Latreille, 1825 | Afterkrebse | 7 | Arten | Taxom |
| Hippolytidae Dana, 1852 | Marmorgarnelen | 45 | Arten | Taxom |
| Holognathidae G. Thomson, 1904 | | 1 | Art | Taxom |
| Homolidae De Haan, 1839 | Bartkrabben | 9 | Arten | Taxom |
| Homolodromiidae Alcock, 1899 | | 1 | Art | Taxom |
| Hyalellidae Gurjanova, 1953 | | 3 | Arten | Taxom |
| Hyalidae Bulycheva, 1957 | | 27 | Arten | Taxom |
| Hymenosomatidae MacLeay, 1838 | Falsche Spinnenkrabben | 7 | Arten | Taxom |
| Hyperiidae Dana, 1853 | Parasitische Flohkrebse | 18 | Arten | Taxom |
| Hyperiopsidae Bovallius, 1886 | | 1 | Art | Taxom |
| Idoteidae Samouelle, 1819 | | 43 | Arten | Taxom |
| Inachidae MacLeay, 1838 | | 22 | Arten | Taxom |
| Inachoididae Dana, 1851 | | 2 | Arten | Taxom |
| Iphiculidae Alcock, 1896 | | 2 | Arten | Taxom |
| Iphimediidae Boeck, 1871 | | 20 | Arten | Taxom |
| Isaeidae Dana, 1853 | | 34 | Arten | Taxom |
| Ischnomesidae Hansen, 1916 | | 8 | Arten | Taxom |
| Ischyroceridae Stebbing, 1899 | | 78 | Arten | Taxom |
| Janiridae Sars, 1897 | | 28 | Arten | Taxom |
| Joeropsididae Nordenstam, 1933 | | 1 | Art | Taxom |
| Kalliapseudidae Lang, 1956 | | 1 | Art | Taxom |
| Kamakidae Myers & Lowry, 2003 | | 1 | Art | Taxom |
| Katianiridae Svavarsson, 1987 | | 3 | Arten | Taxom |
| Koonungidae Sayce, 1908 | | 1 | Art | Taxom |
| Lafystiidae Krøyer, 1842 | | 1 | Art | Taxom |
| Lampropidae Sars, 1878 | | 20 | Arten | Taxom |
| Lanceolidae Bovallius, 1887 | | 1 | Art | Taxom |
| Laomediidae Borradaile, 1903 | | 1 | Art | Taxom |
| Laphystiopsidae Stebbing, 1899 | | 1 | Art | Taxom |
| Latreilliidae Stimpson, 1858 | Langbeinkrabben | 1 | Art | Taxom |
| Lepechinellidae Schellenberg, 1926 | | 2 | Arten | Taxom |
| Leptanthuridae Poore, 2001 | | 6 | Arten | Taxom |
| Leptocheliidae Lang, 1973 | | 17 | Arten | Taxom |
| Leptognathiidae Sieg, 1976 | | 19 | Arten | Taxom |
| Lestrigonidae Zeidler, 2004 | | 1 | Art | Taxom |
| Leuconidae Sars, 1878 | | 31 | Arten | Taxom |
| Leucosiidae Samouelle, 1819 | Kugelkrabben | 27 | Arten | Taxom |
| Leucothoidae Dana, 1852 | | 17 | Arten | Taxom |
| Ligiidae Leach, 1814 | Klippenasseln | 9 | Arten | Taxom |
| Liljeborgiidae Stebbing, 1899 | | 16 | Arten | Taxom |
| Limnoriidae White, 1850 | | 5 | Arten | Taxom |
| Lipkiidae Burukovsky, 2012 | | 0 | Arten | Taxom |
| Lithodidae Samouelle, 1819 | Königskrabben | 13 | Arten | Taxom |
| Lophogastridae Sars, 1870 | | 1 | Art | Taxom |
| Luciferidae De Haan, 1849 | | 3 | Arten | Taxom |
| Lycaeidae Claus, 1879 | | 1 | Art | Taxom |
| Lysianassidae Dana, 1849 | | 165 | Arten | Taxom |
| Lysiosquillidae Giesbrecht, 1910 | | 1 | Art | Taxom |
| Lysmatidae Dana, 1852 | | 5 | Arten | Taxom |
| Macrocheiridae Dana, 1851 | | 1 | Art | Taxom |
| Macrophthalmidae Dana, 1851 | | 2 | Arten | Taxom |
| Macropipidae Rafinesque, 1815 | | 0 | Arten | Taxom |
| Macrostylidae Hansen, 1916 | | 4 | Arten | Taxom |
| Maeridae Krapp-Schickel, 2008 | | 5 | Arten | Taxom |
| Majidae Samouelle, 1819 | Dekorateurkrabben | 20 | Arten | Taxom |
| Mathildellidae Karasawa & Kato, 2003 | | 2 | Arten | Taxom |
| Matutidae De Haan, 1835 | | 2 | Arten | Taxom |
| Megaluropidae Thomas & Bar..., 1987 | | 2 | Arten | Taxom |
| Melitidae Bousfield, 1973 | | 41 | Arten | Taxom |
| Melphidippidae Stebbing, 1899 | | 8 | Arten | Taxom |
| Menippidae Ortmann, 1893 | Felsenkrabben | 9 | Arten | Taxom |
| Metapseudidae Lang, 1970 | | 1 | Art | Taxom |
| Microniscidae | | 1 | Art | Taxom |
| Micruropodidae Kamaltynov, 1999 | | 4 | Arten | Taxom |
| Mictyridae Dana, 1851 | Soldatenkrabben | 1 | Art | Taxom |
| Mithracidae Balss, 1929 | | 17 | Arten | Taxom |
| Munididae Ahyong, Baba..., 2010 | | 21 | Arten | Taxom |
| Munidopsidae Whiteaves, 1874 | | 10 | Arten | Taxom |
| Munnidae Sars, 1897 | | 18 | Arten | Taxom |
| Munnopsidae Lilljeborg, 1864 | | 52 | Arten | Taxom |
| Mysidae Haworth, 1825 | Mysis-Schwebegarnelen | 184 | Arten | Taxom |
| Nannastacidae Spence Bate, 1866 | | 27 | Arten | Taxom |
| Nannoniscidae Hansen, 1916 | | 12 | Arten | Taxom |
| Nannosquillidae Manning, 1980 | | 1 | Art | Taxom |
| Nebaliidae Samouelle, 1819 | | 10 | Arten | Taxom |
| Nebaliopsididae Hessler, 1984 | | 1 | Art | Taxom |
| Necrocarcinidae Föster, 1968 | | 1 | Art | Taxom |
| Nematocarcinidae Smith, 1884 | | 1 | Art | Taxom |
| Nephropidae Dana, 1852 | Hummer | 15 | Arten | Taxom |
| Niphargidae Bousfield, 1977 | | 4 | Arten | Taxom |
| Nototanaidae Sieg, 1976 | | 23 | Arten | Taxom |
| Ochlesidae Stebbing, 1910 | | 0 | Arten | Taxom |
| Ocypodidae Rafinesque, 1815 | Reiterkrabben | 15 | Arten | Taxom |
| Odiidae Coleman & Ba..., 1991 | | 3 | Arten | Taxom |
| Odontodactylidae Manning, 1980 | | 1 | Art | Taxom |
| Oedicerotidae Lilljeborg, 1865 | | 87 | Arten | Taxom |
| Ogyrididae Holthuis, 1955 | Stielaugengarnelen | 1 | Art | Taxom |
| Ommatogammaridae Kamaltynov, 2010 | | 2 | Arten | Taxom |
| Oniscidae Latreille, 1802 | Mauerasseln | 5 | Arten | Taxom |
| Opisidae Lowry & Stod..., 1995 | | 9 | Arten | Taxom |
| Oplophoridae Dana, 1852 | | 5 | Arten | Taxom |
| Oregoniidae Garth, 1958 | | 8 | Arten | Taxom |
| Orithyiidae Dana, 1853 | | 0 | Arten | Taxom |
| Oxycephalidae Dana, 1852 | | 1 | Art | Taxom |
| Oziidae Dana, 1851 | | 0 | Arten | Taxom |
| Pachyschesidae Kamaltynov, 1999 | | 1 | Art | Taxom |
| Pagurapseudidae Lang, 1970 | | 2 | Arten | Taxom |
| Paguridae Latreille, 1802 | Rechtshändige Einsiedlerkrebse | 59 | Arten | Taxom |
| Pakynidae Lowry & Myers, 2017 | | 3 | Arten | Taxom |
| Palaemonidae Rafinesque, 1815 | Felsengarnelen | 71 | Arten | Taxom |
| Paleoxanthopsidae Schweitzer, 2003 | | 0 | Arten | Taxom |
| Palicidae Bouvier, 1898 | | 1 | Art | Taxom |
| Palinuridae Latreille, 1802 | Langusten | 12 | Arten | Taxom |
| Pallaseidae Tachteew, 2000 | | 10 | Arten | Taxom |
| Pandalidae Haworth, 1825 | Langhorngarnelen | 29 | Arten | Taxom |
| Panopeidae Ortmann, 1893 | | 10 | Arten | Taxom |
| Parabathynellidae Cho, 1996 | | 6 | Arten | Taxom |
| Paramunnidae Vanhöffen, 1914 | | 10 | Arten | Taxom |
| Paranthuridae Menzies & Glynn, 1968 | | 5 | Arten | Taxom |
| Parapaguridae S. I. Smith, 1882 | Tiefsee-Einsiedlerkrebse | 3 | Arten | Taxom |
| Parapseudidae Gutu, 1981 | | 3 | Arten | Taxom |
| Parascelidae Bovallius, 1887 | | 1 | Art | Taxom |
| Parastacidae Huxley, 1879 | | 23 | Arten | Taxom |
| Paratanaidae Lang, 1949 | | 4 | Arten | Taxom |
| Parathelphusidae Alcock, 1910 | | 10 | Arten | Taxom |
| Pardaliscidae Boeck, 1871 | | 13 | Arten | Taxom |
| Parthenopidae MacLeay, 1838 | Ellbogenkrabben | 13 | Arten | Taxom |
| Pasiphaeidae Dana, 1852 | Glassgarnelen | 10 | Arten | Taxom |
| Penaeidae Rafinesque, 1815 | Geißelgarnelen | 38 | Arten | Taxom |
| Perspicarididae Briggs, 1978 | | 1 | Art | Taxom |
| Petalophthalmidae Czerniavsky, 1882 | | 1 | Art | Taxom |
| Philosciidae Kinahan, 1857 | Moosasseln | 11 | Arten | Taxom |
| Phliantidae Stebbing, 1899 | | 3 | Arten | Taxom |
| Photidae (Boeck, 1871) | | 1 | Art | Taxom |
| Phoxocephalidae Sars, 1891 | | 47 | Arten | Taxom |
| Phoxocephalopsidae Barnard & Dr..., 1982 | | 2 | Arten | Taxom |
| Phronimidae Rafinesque, 1815 | Parasitische Flohkrebse | 2 | Arten | Taxom |
| Phrosinidae Dana, 1852 | | 2 | Arten | Taxom |
| Pilumnidae Samouelle, 1819 | Borstenkrabben | 8 | Arten | Taxom |
| Pinnotheridae De Haan, 1833 | Erbsenkrabben | 9 | Arten | Taxom |
| Pirimelidae Alcock, 1899 | | 2 | Arten | Taxom |
| Plagusiidae Dana, 1851 | Klauenkrabben | 4 | Arten | Taxom |
| Plakarthriidae Hansen, 1905 | | 1 | Art | Taxom |
| Platyarthridae Verhoeff, 1949 | | 8 | Arten | Taxom |
| Platyischnopidae Barnard & Dr..., 1979 | | 3 | Arten | Taxom |
| Platyscelidae Bate, 1862 | | 1 | Art | Taxom |
| Platyxanthidae Guinot, 1977 | | 0 | Arten | Taxom |
| Pleustidae Bucholz, 1874 | | 41 | Arten | Taxom |
| Podasconidae Giard & Bonnier, 1895 | | 2 | Arten | Taxom |
| Podoceridae Leach, 1814 | | 36 | Arten | Taxom |
| Podoprionidae Lowry & Stod..., 1996 | | 1 | Art | Taxom |
| Polychelidae Wood-Mason, 1874 | | 2 | Arten | Taxom |
| Pontogammaridae Bousfield, 1977 | | 8 | Arten | Taxom |
| Pontogeneiidae Stebbing, 1906 | | 10 | Arten | Taxom |
| Pontoporeiidae Dana, 1853 | | 29 | Arten | Taxom |
| Porcellanidae Haworth, 1825 | Porzellankrabben | 28 | Arten | Taxom |
| Porcellionidae Brandt & Rat..., 1831 | Kellerasseln | 49 | Arten | Taxom |
| Portunidae Rafinesque, 1815 | Schwimmkrabben | 97 | Arten | Taxom |
| Potamidae Ortmann, 1896 | Zehnfusskrebse | 7 | Arten | Taxom |
| Potamonautidae Bott, 1970 | | 4 | Arten | Taxom |
| Processidae Ortmann, 1896 | Nachtgarnelen | 4 | Arten | Taxom |
| Progeryonidae Å tevÄić..., 2005 | | 0 | Arten | Taxom |
| Pronoidae Dana, 1852 | | 1 | Art | Taxom |
| Pseudidotheidae Ohlin, 1901 | | 1 | Art | Taxom |
| Pseudocarcinidae Ng & Davie, 2020 | | 1 | Art | Taxom |
| Pseudocumatidae G. O. Sars, 1878 | | 11 | Arten | Taxom |
| Pseudojaniridae Wilson, 1986 | | 1 | Art | Taxom |
| Pseudorhombilidae Alcock, 1900 | | 1 | Art | Taxom |
| Pseudosquillidae Manning, 1977 | | 1 | Art | Taxom |
| Pseudotanaidae Sieg, 1976 | | 11 | Arten | Taxom |
| Pseudothelphusidae Ortmann, 1893 | | 1 | Art | Taxom |
| Raninidae De Haan, 1839 | Froschkrabben | 6 | Arten | Taxom |
| Rectarcturidae Poore, 2001 | | 1 | Art | Taxom |
| Retroplumidae Gill, 1894 | | 1 | Art | Taxom |
| Rhynchocinetidae Ortmann, 1890 | Tanzgarnelen | 1 | Art | Taxom |
| Salentinellidae Bousfield, 1977 | | 1 | Art | Taxom |
| Santiidae Wilson, 1987 | | 0 | Arten | Taxom |
| Scinidae Stebbing, 1888 | | 4 | Arten | Taxom |
| Scleropactidae Verhoeff, 1938 | | 1 | Art | Taxom |
| Scopelocheiridae Lowry & Stod..., 1997 | | 5 | Arten | Taxom |
| Scyllaridae Latreille, 1825 | Bärenkrebse | 18 | Arten | Taxom |
| Scyphacidae Dana, 1852 | | 1 | Art | Taxom |
| Sergestidae Dana, 1852 | | 12 | Arten | Taxom |
| Serolidae Dana, 1852 | | 20 | Arten | Taxom |
| Sesarmidae Dana, 1851 | | 17 | Arten | Taxom |
| Sicafodiidae Just, 2004 | | 1 | Art | Taxom |
| Sicyoniidae Ortmann, 1898 | | 6 | Arten | Taxom |
| Solenoceridae Wood-Mason, 1891 | | 3 | Arten | Taxom |
| Sphaeromatidae Latreille, 1825 | | 37 | Arten | Taxom |
| Sphyrapidae Gutu, 1980 | | 6 | Arten | Taxom |
| Sphyrapodidae Gutu, 1980 | | 1 | Art | Taxom |
| Spongicolidae von Martens, 1872 | | 2 | Arten | Taxom |
| Squillidae Latreille, 1802 | | 13 | Arten | Taxom |
| Stegocephalidae Dana, 1852 | | 26 | Arten | Taxom |
| Stenetriidae Hansen, 1905 | | 2 | Arten | Taxom |
| Stenopodidae Risso, 1826 | Scherengarnelen | 1 | Art | Taxom |
| Stenothoidae Boeck, 1871 | | 80 | Arten | Taxom |
| Stilipididae Holmes, 1908 | | 1 | Art | Taxom |
| Styloniscidae Vandel, 1952 | | 2 | Arten | Taxom |
| Synopiidae Dana, 1852 | | 15 | Arten | Taxom |
| Talitridae Rafinesque, 1815 | | 38 | Arten | Taxom |
| Tanaellidae Larsen & Wilson, 2002 | | 4 | Arten | Taxom |
| Tanaidae Dana, 1849 | | 27 | Arten | Taxom |
| Tecticipitidae Bruce, 1993 | | 2 | Arten | Taxom |
| Tetraliidae Castro, Ng &..., 2004 | | 1 | Art | Taxom |
| Thambematidae Stebbing, 1913 | | 1 | Art | Taxom |
| Thermosbaenidae Monod, 1927 | | 1 | Art | Taxom |
| Thiidae Dana, 1852 | | 2 | Arten | Taxom |
| Thoridae Kingsley, 1878 | | 28 | Arten | Taxom |
| Trachelipodidae Strouhal, 1953 | | 16 | Arten | Taxom |
| Trapeziidae Miers, 1886 | Korallenkrabben | 1 | Art | Taxom |
| Trichodactylidae H. Milne-Edw..., 1835 | | 3 | Arten | Taxom |
| Trichoniscidae G. O. Sars, 1899 | | 20 | Arten | Taxom |
| Tumidocarcinidae Schweitzer, 2005 | | 0 | Arten | Taxom |
| Tychidae (Dana, 1851) | | 2 | Arten | Taxom |
| Tylidae Dana, 1852 | | 1 | Art | Taxom |
| Typhlotanaidae (Sieg, 1986) | | 4 | Arten | Taxom |
| Tyrannophontidae Schram, 1984 | | 1 | Art | Taxom |
| Unciolidae Myers & Lowry, 2003 | | 1 | Art | Taxom |
| Upogebiidae Borradaile, 1903 | | 9 | Arten | Taxom |
| Uristidae Hurley, 1963 | | 62 | Arten | Taxom |
| Urohaustoriidae Barnard & Dr..., 1982 | | 3 | Arten | Taxom |
| Urothoidae Bousfield, 1978 | | 12 | Arten | Taxom |
| Varunidae H. Milne-Edw..., 1853 | Varuna-Krabben | 15 | Arten | Taxom |
| Vermectiadidae Just & Poore, 1992 | | 0 | Arten | Taxom |
| Vibiliidae Dana, 1852 | | 4 | Arten | Taxom |
| Whiteleggiidae Gutu, 1972 | | 1 | Art | Taxom |
| Xanthidae MacLeay, 1838 | Rundkrabben | 41 | Arten | Taxom |
| Xiphocarididae Ortmann, 1895 | | 1 | Art | Taxom |
| Zanthopsidae Vía, 1959 | | 1 | Art | Taxom |
| Zobrachoidae Barnard & Dr..., 1982 | | 1 | Art | Taxom |