| Abrsiidae Karanovic, 2008 | | 1 | Species | Taxom |
| Acartiidae Sars, 1903 | | 82 | Species | Taxom |
| Adenopleurellidae Huys, 1990 | | 1 | Species | Taxom |
| Aegisthidae Giesbrecht, 1893 | | 78 | Species | Taxom |
| Aetideidae Giesbrecht, 1893 | | 250 | Species | Taxom |
| Ambunguipedidae (Huys, 1990) | | 2 | Species | Taxom |
| Ameiridae Monard, 1927 | | 319 | Species | Taxom |
| Anchimolgidae Humes & Boxs..., 1996 | | 137 | Species | Taxom |
| Ancorabolidae Sars, 1909 | | 49 | Species | Taxom |
| Anelasmatidae Gruvel, 1905 | | 1 | Species | Taxom |
| Antheacheridae Sars, 1870 | | 4 | Species | Taxom |
| Anthessiidae Humes, 1986 | | 49 | Species | Taxom |
| Archaeobalanidae Newman & Ross, 1976 | | 161 | Species | Taxom |
| Archinotodelphyidae Lang, 1949 | | 2 | Species | Taxom |
| Arctokonstantinidae Markhaseva &..., 2001 | | 1 | Species | Taxom |
| Arenopontiidae Martínez Arb..., 1994 | | 12 | Species | Taxom |
| Argestidae Por, 1986 | | 75 | Species | Taxom |
| Argulidae Leach, 1819 | Carp lice | 116 | Species | Taxom |
| Arietellidae Sars, 1902 | | 37 | Species | Taxom |
| Armilliferidae Kishida, 1928 | | 7 | Species | Taxom |
| Artotrogidae Brady, 1880 | | 83 | Species | Taxom |
| Ascidicolidae Thorell, 1860 | | 68 | Species | Taxom |
| Ascothoracidae Grygier, 1987 | | 5 | Species | Taxom |
| Asterocheridae Giesbrecht, 1899 | | 264 | Species | Taxom |
| Augaptilidae G. O. Sars, 1905 | | 134 | Species | Taxom |
| Balaenophilidae Sars, 1910 | | 4 | Species | Taxom |
| Balanidae Leach, 1806 | | 233 | Species | Taxom |
| Basipodellidae Boxshall & L..., 1983 | | 7 | Species | Taxom |
| Bathylasmatidae Newman & Ross, 1971 | | 1 | Species | Taxom |
| Bathypontiidae Brodsky, 1950 | | 29 | Species | Taxom |
| Boholinidae Fosshagen & ..., 1989 | | 4 | Species | Taxom |
| Bomolochidae Claus, 1875 | | 171 | Species | Taxom |
| Botryllophilidae (G.O. Sars, 1921) | | 1 | Species | Taxom |
| Bredocarididae Müller & Wal..., 1988 | | 0 | Species | Taxom |
| Brychiopontiidae Humes, 1974 | | 1 | Species | Taxom |
| Buproridae Thorell, 1859 | | 3 | Species | Taxom |
| Calanidae Dana, 1846 | | 78 | Species | Taxom |
| Calanticidae Zevina, 1978 | | 38 | Species | Taxom |
| Caligidae Burmeister, 1834 | Sea lice | 491 | Species | Taxom |
| Calverocheridae Stock, 1968 | | 4 | Species | Taxom |
| Cancerillidae Giesbrecht, 1897 | | 12 | Species | Taxom |
| Cancrincolidae Fiers, 1990 | | 7 | Species | Taxom |
| Candaciidae Giesbrecht, 1893 | | 50 | Species | Taxom |
| Canthocamptidae G. O. Sars, 1906 | | 574 | Species | Taxom |
| Canuellidae Lang, 1944 | | 41 | Species | Taxom |
| Catiniidae Embleton, 1901 | | 6 | Species | Taxom |
| Catophragmidae Utinomi, 1968 | | 3 | Species | Taxom |
| Cecropidae (Dana, 1849) | | 8 | Species | Taxom |
| Centropagidae Giesbrecht, 1893 | | 153 | Species | Taxom |
| Cephalobaenidae Fain, 1961 | | 18 | Species | Taxom |
| Cerviniidae (Sars, 1903) | | 1 | Species | Taxom |
| Chappuisiidae Chappuis, 1940 | | 2 | Species | Taxom |
| Chelonibiidae Pilsbry, 1916 | Turtle barnacle | 10 | Species | Taxom |
| Chionelasmatidae Buckeridge, 1983 | | 4 | Species | Taxom |
| Chitonophilidae Avdeev & Sir..., 1991 | | 4 | Species | Taxom |
| Chondracanthidae H. Milne-Edw..., 1840 | | 196 | Species | Taxom |
| Chordeumiidae Boxshall, 1988 | | 12 | Species | Taxom |
| Chthamalidae Darwin, 1854 | | 69 | Species | Taxom |
| Chthamalophilidae Bocquet-Védr..., 1961 | | 4 | Species | Taxom |
| Clausidiidae Embleton, 1901 | | 100 | Species | Taxom |
| Clausiidae Giesbrecht, 1895 | | 31 | Species | Taxom |
| Clausocalanidae Giesbrecht, 1893 | | 42 | Species | Taxom |
| Cletodidae T. Scott, 1905 | | 154 | Species | Taxom |
| Cletopsyllidae Huys & Williams, 1989 | | 4 | Species | Taxom |
| Clistosaccidae Boschma, 1928 | | 7 | Species | Taxom |
| Clytemnestridae Scott, 1909 | | 6 | Species | Taxom |
| Coralliomyzontidae Humes & Stock, 1991 | | 7 | Species | Taxom |
| Corallovexiidae Stock, 1975 | | 8 | Species | Taxom |
| Coronulidae Leach, 1817 | Whale barnacle | 12 | Species | Taxom |
| Corycaeidae Dana, 1852 | | 99 | Species | Taxom |
| Cryptophialidae Gerstaecker, 1870 | | 20 | Species | Taxom |
| Ctenosculidae Thiele, 1925 | | 3 | Species | Taxom |
| Cumoniscidae Nierstrasz &..., 1923 | | 15 | Species | Taxom |
| Cyclopettidae Martínez Arb..., 2000 | | 6 | Species | Taxom |
| Cyclopicinidae (G.O. Sars, 1913) | | 2 | Species | Taxom |
| Cyclopidae Rafinesque, 1815 | Copepods | 904 | Species | Taxom |
| Cyclopinidae Sars, 1913 | | 67 | Species | Taxom |
| Cylindropsyllidae Sars, 1909 | | 30 | Species | Taxom |
| Darcythompsoniidae Lang, 1936 | | 23 | Species | Taxom |
| Dendrogastridae Gruvel, 1905 | | 24 | Species | Taxom |
| Deoterthridae Boxshall & L..., 1987 | | 1 | Species | Taxom |
| Derocheilocarididae Pennak & Zinn, 1943 | | 9 | Species | Taxom |
| Diaixidae Sars, 1902 | | 6 | Species | Taxom |
| Diaptomidae Baird, 1850 | | 555 | Species | Taxom |
| Dichelesthiidae Milne Edwards, 1840 | | 4 | Species | Taxom |
| Dichelinidae Boxshall & O..., 2001 | | 2 | Species | Taxom |
| Dinopontiidae Murnane, 1967 | | 4 | Species | Taxom |
| Diosaccidae (G. O. Sars, 1906) | | 12 | Species | Taxom |
| Dirivultidae Humes & Dojiri, 1981 | | 42 | Species | Taxom |
| Discoidae Gordejeva, 1975 | | 6 | Species | Taxom |
| Dissonidae Yamaguti, 1963 | | 9 | Species | Taxom |
| Doryphallophoridae Huys, 1991 | | 4 | Species | Taxom |
| Duplorbidae Høeg & Rybakov, 1992 | | 5 | Species | Taxom |
| Ecbathyriontidae Humes, 1987 | | 1 | Species | Taxom |
| Echiurophilidae Delamare-Deb..., 1955 | | 1 | Species | Taxom |
| Ectinosomatidae G. O. Sars, 1903 | | 246 | Species | Taxom |
| Enterognathidae Illg & Dudley, 1980 | | 5 | Species | Taxom |
| Enteropsidae Thorell, 1859 | | 4 | Species | Taxom |
| Entobiidae Ho, 1984 | | 2 | Species | Taxom |
| Entomolepididae Brady, 1899 | | 11 | Species | Taxom |
| Eolepadidae Buckeridge, 1983 | | 8 | Species | Taxom |
| Epacteriscidae Fosshagen, 1973 | | 18 | Species | Taxom |
| Erebonasteridae Humes, 1987 | | 10 | Species | Taxom |
| Ergasilidae von Nordmann, 1832 | | 196 | Species | Taxom |
| Eucalanidae Giesbrecht, 1893 | | 35 | Species | Taxom |
| Euchaetidae Giesbrecht, 1893 | | 156 | Species | Taxom |
| Eudactylinidae C. B. Wilson, 1932 | | 52 | Species | Taxom |
| Eunicicolidae Sars, 1918 | | 4 | Species | Taxom |
| Euryphoridae (Wilson, 1905) | | 28 | Species | Taxom |
| Euterpinidae Brian, 1921 | | 2 | Species | Taxom |
| Fosshageniidae Suárez-Morál..., 1996 | | 4 | Species | Taxom |
| Gastrodelphyidae List, 1889 | | 3 | Species | Taxom |
| Gelyellidae Rouch & Lesc..., 1977 | | 2 | Species | Taxom |
| Giselinidae Martínez Arb..., 2000 | | 0 | Species | Taxom |
| Hamondiidae Huys, 1990 | | 1 | Species | Taxom |
| Hansenocarididae Itô, 1985 | Hansenocaris | 6 | Species | Taxom |
| Harpacticidae Dana, 1846 | | 76 | Species | Taxom |
| Hatschekiidae Kabata, 1979 | | 109 | Species | Taxom |
| Hemicyclopinidae Martínez Arb..., 2001 | | 10 | Species | Taxom |
| Hemitrochiscidae | | 4 | Species | Taxom |
| Herpyllobiidae Hansen, 1892 | | 17 | Species | Taxom |
| Heteralepadidae Nilsson-Cantell, 1921 | | 40 | Species | Taxom |
| Heterorhabdidae Sars, 1902 | | 72 | Species | Taxom |
| Huntemanniidae (Por, 1986) | | 34 | Species | Taxom |
| Hyperbioncidae | | 1 | Species | Taxom |
| Hyponeoidae Heegaard, 1962 | | 3 | Species | Taxom |
| Iblidae Leach, 1825 | | 5 | Species | Taxom |
| Idioiblidae Buckeridge &..., 2006 | | 4 | Species | Taxom |
| Idyanthidae Lang, 1944 | | 6 | Species | Taxom |
| Iveidae Tung, Cheng,..., 2014 | | 1 | Species | Taxom |
| Kelleriidae Humes & Boxs..., 1996 | | 10 | Species | Taxom |
| Koleolepadidae Hiro, 1933 | | 3 | Species | Taxom |
| Kroyeriidae Kabata, 1979 | | 28 | Species | Taxom |
| Lamippidae Joliet, 1882 | | 60 | Species | Taxom |
| Laophontidae Scott, 1905 | | 303 | Species | Taxom |
| Laophontopsidae Huys & Willems, 1989 | | 5 | Species | Taxom |
| Latiremidae Bozic, 1969 | | 2 | Species | Taxom |
| Lauridae Gruvel, 1905 | | 8 | Species | Taxom |
| Lepadidae Darwin, 1852 | Goose barnacles | 38 | Species | Taxom |
| Leptastacidae Lang, 1948 | | 44 | Species | Taxom |
| Leptopontiidae Lang, 1948 | | 24 | Species | Taxom |
| Lernaeidae Cobbold, 1879 | | 71 | Species | Taxom |
| Lernaeodiscidae Boschma, 1928 | | 19 | Species | Taxom |
| Lernaeopodidae H. Milne-Edw..., 1840 | | 386 | Species | Taxom |
| Lernaeosoleidae (Yamaguti, 1963) | | 2 | Species | Taxom |
| Lernanthropidae Kabata, 1979 | | 118 | Species | Taxom |
| Lichomolgidae Kossmann, 1877 | | 202 | Species | Taxom |
| Linguatulidae Haldeman, 1851 | | 3 | Species | Taxom |
| Lithoglyptidae Aurivillius, 1892 | | 36 | Species | Taxom |
| Longipediidae Sars, 1903 | | 15 | Species | Taxom |
| Louriniidae Monard, 1927 | | 2 | Species | Taxom |
| Lubbockiidae Huys & Böttg..., 1997 | | 22 | Species | Taxom |
| Lucicutiidae Sars, 1902 | | 41 | Species | Taxom |
| Macrochironidae Humes & Boxs..., 1996 | | 26 | Species | Taxom |
| Makrostrotidae Huys, Fatih,..., 2011 | | 2 | Species | Taxom |
| Malacolepadidae Hiro, 1937 | | 2 | Species | Taxom |
| Mantridae Leigh-Sharpe, 1934 | | 3 | Species | Taxom |
| Mecynoceridae (Andronov, 1973) | | 3 | Species | Taxom |
| Megacalanidae Sewell, 1947 | | 29 | Species | Taxom |
| Megapontiidae Heptner, 1968 | | 3 | Species | Taxom |
| Melinnacheridae (Lutzen, 1964) | | 4 | Species | Taxom |
| Mesaiokeratidae Matthews, 1961 | | 3 | Species | Taxom |
| Mesoglicolidae de Zulueta, 1911 | | 1 | Species | Taxom |
| Mesoprosopidae | | 1 | Species | Taxom |
| Metidae Sars, 1910 | | 18 | Species | Taxom |
| Metridinidae G. O. Sars, 1902 | | 45 | Species | Taxom |
| Micrallectidae Huys, 2001 | | 2 | Species | Taxom |
| Microdajidae Boxshall & L..., 1987 | | 6 | Species | Taxom |
| Micropontiidae Gooding, 1957 | | 2 | Species | Taxom |
| Miraciidae Dana, 1846 | | 453 | Species | Taxom |
| Misophriidae Brady, 1878 | | 13 | Species | Taxom |
| Monstrillidae Dana, 1849 | | 150 | Species | Taxom |
| Monstrilloidae | | 1 | Species | Taxom |
| Mormonillidae Giesbrecht, 1893 | | 5 | Species | Taxom |
| Mycetomorphidae Høeg & Rybakov, 1992 | | 3 | Species | Taxom |
| Myicolidae Yamaguti, 1936 | | 25 | Species | Taxom |
| Mytilicolidae Bocquet & Stock, 1957 | | 12 | Species | Taxom |
| Nanaspididae Humes & Cressey, 1959 | | 16 | Species | Taxom |
| Nannopodidae Brady, 1880 | | 1 | Species | Taxom |
| Naobranchiidae (Yamaguti, 1939) | | 16 | Species | Taxom |
| Neobrachylepadidae Newman & Yam..., 1995 | | 1 | Species | Taxom |
| Neobradyidae Oloffson, 1917 | | 9 | Species | Taxom |
| Neoverrucidae Newman, 1989 | | 2 | Species | Taxom |
| Nereicolidae Claus, 1875 | | 12 | Species | Taxom |
| Nicothoidae Dana, 1852 | | 132 | Species | Taxom |
| Normanellidae Lang, 1944 | | 24 | Species | Taxom |
| Notodelphyidae Dana, 1852 | | 155 | Species | Taxom |
| Novocriniidae Huys & Iliffe, 1998 | | 3 | Species | Taxom |
| Nullosetigeridae Soh, Ohtsuk..., 1999 | | 7 | Species | Taxom |
| Octopicolidae Humes & Boxs..., 1996 | | 4 | Species | Taxom |
| Oithonidae Dana, 1852 | | 60 | Species | Taxom |
| Oncaeidae Giesbrecht, 1893 | | 121 | Species | Taxom |
| Onceroxenidae Huys, 1991 | | 2 | Species | Taxom |
| Orthopsyllidae Huys, 1990 | | 11 | Species | Taxom |
| Oxynaspididae Gruvel, 1905 | | 31 | Species | Taxom |
| Ozmanidae Ho & Thatcher, 1989 | | 2 | Species | Taxom |
| Pachylasmatidae Utinomi, 1968 | | 61 | Species | Taxom |
| Pachynesthidae Hesse, 1878 | | 3 | Species | Taxom |
| Palpophriidae Boxshall & J..., 2000 | | 1 | Species | Taxom |
| Pandaridae Milne Edwards, 1840 | | 88 | Species | Taxom |
| Paracalanidae Giesbrecht, 1893 | | 59 | Species | Taxom |
| Paralubbockiidae Boxshall & Huys, 1989 | | 1 | Species | Taxom |
| Paramesochridae Lang, 1944 | | 120 | Species | Taxom |
| Parapontellidae Giesbrecht, 1893 | | 1 | Species | Taxom |
| Parastenheliidae Lang, 1936 | | 10 | Species | Taxom |
| Parastenocarididae Chappuis, 1933 | | 188 | Species | Taxom |
| Peltidiidae Sars, 1904 | | 57 | Species | Taxom |
| Peltogastridae Lilljeborg, 1860 | | 48 | Species | Taxom |
| Pennellidae Burmeister, 1816 | | 153 | Species | Taxom |
| Petrarcidae Gruvel, 1905 | | 11 | Species | Taxom |
| Phaennidae G. O. Sars, 1902 | | 86 | Species | Taxom |
| Pharodidae (Illg, 1948) | | 2 | Species | Taxom |
| Philichthyidae Vogt, 1877 | | 69 | Species | Taxom |
| Philoblennidae Izawa, 1976 | | 5 | Species | Taxom |
| Phyllodicolidae Delamare-Deb..., 1961 | | 3 | Species | Taxom |
| Phyllognathopodidae Gurney, 1932 | | 6 | Species | Taxom |
| Phyllopidae (Campaner, 1977) | | 6 | Species | Taxom |
| Platycopiidae G. O. Sars, 1911 | | 7 | Species | Taxom |
| Platylepadidae Newman & Ross, 1976 | Turtle barnacle | 16 | Species | Taxom |
| Poecilasmatidae Annandale, 1909 | | 92 | Species | Taxom |
| Pollicipedidae Leach, 1817 | | 21 | Species | Taxom |
| Polyankyliidae Ho & Kim, 1997 | | 2 | Species | Taxom |
| Polyascidae Høeg & Glenner, 2019 | | 4 | Species | Taxom |
| Polysaccidae Lützen & Tak..., 1996 | | 2 | Species | Taxom |
| Pontellidae Dana, 1852 | | 151 | Species | Taxom |
| Pontoeciellidae Giesbrecht, 1895 | | 1 | Species | Taxom |
| Porcellidiidae Boeck, 1865 | | 103 | Species | Taxom |
| Porocephalidae Sambon, 1922 | | 7 | Species | Taxom |
| Psammocyclopinidae Martínez Arb..., 2001 | | 5 | Species | Taxom |
| Pseudanthessiidae Humes & Stock, 1972 | | 57 | Species | Taxom |
| Pseudocyclopidae Giesbrecht, 1893 | | 30 | Species | Taxom |
| Pseudocyclopiidae Sars, 1902 | | 10 | Species | Taxom |
| Pseudocycnidae Wilson, 1922 | | 18 | Species | Taxom |
| Pseudodiaptomidae Sars, 1902 | | 76 | Species | Taxom |
| Pseudohatschekiidae Tang & al., 2010 | | 1 | Species | Taxom |
| Pseudotachidiidae Lang, 1936 | | 100 | Species | Taxom |
| Pyrgomatidae Gray, 1825 | Coral barnacle | 82 | Species | Taxom |
| Raillietiellidae Sambon, 1922 | | 1 | Species | Taxom |
| Rataniidae Giesbrecht, 1897 | | 3 | Species | Taxom |
| Reighardiidae Heymons, 1935 | | 2 | Species | Taxom |
| Rhincalanidae Geletin, 1976 | | 7 | Species | Taxom |
| Rhizolepadidae Zevina, 1980 | | 1 | Species | Taxom |
| Rhizothricidae (Por, 1986) | | 19 | Species | Taxom |
| Rhynchomolgidae Humes & Stock, 1972 | | 299 | Species | Taxom |
| Ridgewayiidae Wilson, 1958 | | 23 | Species | Taxom |
| Rostrocalanidae Markhaseva, ..., 2009 | | 0 | Species | Taxom |
| Rotundiclipeidae Huys, 1988 | | 0 | Species | Taxom |
| Ryocalanidae Andronov, 1974 | | 5 | Species | Taxom |
| Sabelliphilidae Gurney, 1927 | | 46 | Species | Taxom |
| Saccopsidae Lützen, 1964 | | 1 | Species | Taxom |
| Sacculinidae Lilljeborg, 1860 | | 108 | Species | Taxom |
| Sambonidae Heymons, 1935 | | 10 | Species | Taxom |
| Sapphirinidae Thorell, 1859 | | 49 | Species | Taxom |
| Scalpellidae Pilsbry, 1907 | | 374 | Species | Taxom |
| Schminkepinellidae Martínez Arb..., 2006 | | 3 | Species | Taxom |
| Scolecithricidae (Giesbrecht, 1892) | | 11 | Species | Taxom |
| Scolecitrichidae Giesbrecht, 1893 | | 236 | Species | Taxom |
| Scottomyzontidae Ivanenko, F..., 2001 | | 1 | Species | Taxom |
| Sebekidae Sambon, 1922 | | 15 | Species | Taxom |
| Serpulidicolidae Stock, 1979 | | 7 | Species | Taxom |
| Shiinoidae Cressey, 1975 | | 7 | Species | Taxom |
| Skaraidae Müller & Wal..., 1985 | | 3 | Species | Taxom |
| Smirnovipinidae Martínez Arb..., 1997 | | 2 | Species | Taxom |
| Speleoithonidae da Rocha & I..., 1991 | | 3 | Species | Taxom |
| Speleophriidae Boxshall & J..., 2000 | | 14 | Species | Taxom |
| Sphyriidae Wilson, 1919 | | 40 | Species | Taxom |
| Spinocalanidae Vervoort, 1951 | | 55 | Species | Taxom |
| Spiophanicolidae Ho, 1984 | | 2 | Species | Taxom |
| Splanchnotrophidae Norman & Scott, 1906 | | 17 | Species | Taxom |
| Sponginticolidae Topsent, 1928 | | 2 | Species | Taxom |
| Spongiocnizontidae Stock & Kleeton, 1964 | | 5 | Species | Taxom |
| Stellicomitidae Humes & Cressey, 1958 | | 12 | Species | Taxom |
| Stephidae Sars, 1902 | | 29 | Species | Taxom |
| Stramentidae Withers, 1920 | | 4 | Species | Taxom |
| Strepidae Cheng, Liu &..., 2016 | | 1 | Species | Taxom |
| Subtriquetridae Fain, 1961 | | 3 | Species | Taxom |
| Sulcanidae Nicholls, 1945 | | 1 | Species | Taxom |
| Superornatiremidae Huys, 1997 | | 3 | Species | Taxom |
| Synagogidae Gruvel, 1905 | | 28 | Species | Taxom |
| Synapticolidae Humes & Boxs..., 1996 | | 44 | Species | Taxom |
| Synaptiphilidae Bocquet, 1953 | | 5 | Species | Taxom |
| Tachidiidae Boeck, 1865 | | 18 | Species | Taxom |
| Taeniacanthidae Wilson, 1911 | | 111 | Species | Taxom |
| Tanypleuridae Kabata, 1969 | | 1 | Species | Taxom |
| Tegastidae G. O. Sars, 1904 | | 44 | Species | Taxom |
| Telsidae Ho, 1967 | | 2 | Species | Taxom |
| Temoridae Giesbrecht, 1893 | | 47 | Species | Taxom |
| Tetraclitidae Gruvel, 1903 | | 53 | Species | Taxom |
| Tetragonicipitidae Lang, 1944 | | 68 | Species | Taxom |
| Thalestridae Sars, 1905 | | 202 | Species | Taxom |
| Thamnomolgidae Humes & Boxs..., 1996 | | 5 | Species | Taxom |
| Tharybidae Sars, 1902 | | 30 | Species | Taxom |
| Thaumatopsyllidae Sars, 1913 | | 3 | Species | Taxom |
| Thompsoniidae Høeg & Ryba..., 1992 | | 14 | Species | Taxom |
| Thompsonulidae Lang, 1944 | | 6 | Species | Taxom |
| Tisbidae Stebbing, 1910 | | 163 | Species | Taxom |
| Tortanidae Sars, 1902 | | 41 | Species | Taxom |
| Trebiidae Wilson, 1905 | | 10 | Species | Taxom |
| Trypetesidae Stebbing, 1910 | | 6 | Species | Taxom |
| Tuccidae (Vervoort, 1962) | | 2 | Species | Taxom |
| Urocopiidae Humes & Stock, 1972 | | 3 | Species | Taxom |
| Vahiniidae Humes, 1967 | | 2 | Species | Taxom |
| Ventriculinidae Leigh-Sharpe, 1934 | | 1 | Species | Taxom |
| Verrucidae Darwin, 1854 | | 84 | Species | Taxom |
| Waikalasmatidae Ross & Newman, 2001 | | 3 | Species | Taxom |
| Xarifiidae Humes, 1960 | | 96 | Species | Taxom |
| Xenocoelomatidae Bresciani & ..., 1966 | | 3 | Species | Taxom |
| Zapfellidae Saint-Seine, 1954 | | 10 | Species | Taxom |
