Acholadidae Hickman & Olsen, 1955 (basis of record)
Acrumenidae Karling, 1980 accepted as Acrumeninae Karling, 1980 (additional source)
Aculeorhynchidae Schilke, 1969 (additional source)
Anonymidae Lang, 1884 (additional source)
Antigonariidae Dörjes, 1968 (additional source)
Antroposthiidae Faubel, 1976 (additional source)
Apidioplanidae Bock, 1926 (basis of record)
Archimonocelidinae Meixner, 1938 (basis of record)
Bdellouridae Diesing, 1862 (additional source)
Bertiliellidae Rieger & Sterrer, 1975 (additional source)
Boniniidae Bock, 1923 (basis of record)
Callioplanidae Hyman, 1953 (additional source)
Centrovarioplanidae Westblad, 1952 (basis of record)
Cercyridae Bohmig, 1906 (additional source)
Cestoplanidae Lang, 1884 (additional source)
Chromoplanidae Bock, 1922 (basis of record)
Convolutidae Graff, 1905 (additional source)
Crassicollidae Dean, 1977 (additional source)
Cryptocelidae Laidlaw, 1903 (additional source)
Cytocystidae Karling, 1964 accepted as Cytocystididae Karling, 1964 (additional source)
Dalyelliida accepted as Dalytyphloplanida (additional source)
Diopisthoporidae Westblad, 1940 (additional source)
Diplopharyngeatidae accepted as Euplanidae Marcus & Marcus, 1966 (basis of record)
Diposthidae Woodworth, 1898 (basis of record)
Discocelidae Laidlaw, 1903 (basis of record)
Ditremageniidae Palombi, 1928 (basis of record)
Emprosthopharyngidae accepted as Stylochoplanidae Faubel, 1983 (basis of record)
Enantiidae Graff, 1889 (additional source)
Fecampiidae Graff, 1903 (additional source)
Gnesiocerotidae Marcus & Marcus, 1966 (additional source)
Gnosonesimidae Reisinger, 1926 (additional source)
Hallangiidae Westblad, 1946 (additional source)
Haploposthiidae Westblad, 1948 accepted as Proporidae Graff, 1882 (additional source)
Hoploplanidae Stummer-Traunfels, 1933 (basis of record)
Hypoblepharinidae Böhmig, 1914 (basis of record)
Hypotrichinidae Bresslau, 1928-1933 (additional source)
Kytorhynchidae Rieger, 1974 (basis of record)
Latocestidae Laidlaw, 1903 (basis of record)
Microstomidae Luther, 1907 (additional source)
Monotoplanidae Ax, 1958 (additional source)
Nadinidae Dörjes, 1968 (additional source)
Nemertoderma Steinböck, 1930 (additional source)
Nemertodermatidae Steinböck, 1930 (additional source)
Notoplanidae Marcus & Marcus, 1966 (additional source)
Opisthogeniidae Palombi, 1928 (basis of record)
Otomesostomatidae Midelburg, 1908 accepted as Otomesostomidae Midelburg, 1908 (basis of record)
Pericelidae Laidlaw, 1902 (basis of record)
Pleioplanidae Faubel, 1983 (additional source)
Polystyliphoridae Ax, 1958 (additional source)
Proplicastomata (basis of record)
Proporidae Graff, 1882 (additional source)
Proporoplanidae (basis of record)
Prosthiostomidae Lang, 1884 (additional source)
Psammorhynchus Meixner, 1938 (additional source)
Pseudoceridae accepted as Pseudocerotidae Lang, 1884 (basis of record)
Pseudocerotidae Lang, 1884 (additional source)
Pterastericolidae Meixner, 1926 (additional source)
Rhabdocoela (basis of record)
Sagittiferidae Kostenko & Mamkaev, 1990 accepted as Convolutidae Graff, 1905 (additional source)
Scleraulophoridae Marcus, 1950 (additional source)
Solenofilomorphidae Dörjes, 1968 (additional source)
Solenopharynginae Ehlers, 1972 (basis of record)
Stenostomidae Vejdovsky, 1880 (additional source)
Stylochidae Stimpson, 1857 (additional source)
Stylochocestidae Bock, 1913 (basis of record)
Stylochoididae Bock, 1913 (basis of record)
Stylochoplanidae Faubel, 1983 (additional source)
Taurididae Kostenko, 1989 (additional source)
Theamidae accepted as Theamatidae Marcus, 1949 (basis of record)
Typhloplanida accepted as Dalytyphloplanida (additional source)
Tyrrheniellidae Riedl, 1959 (additional source)
Ulianiniidae Levinsen, 1879 accepted as Pseudostomidae Graff, 1904-08 (additional source)
Umagillidae Wahl, 1910 (additional source)
Urastomidae Dörler, 1900 (additional source)
Urostomatidae Marcus, 1951 accepted as Urastomidae Dörler, 1900 (basis of record)