Between brackets is the number of accepted extant species
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- Platyhelminthes (5 977)
- Subphylum Catenulida (110)
- Subphylum Platyhelminthes incertae sedis (40)
- Subphylum Rhabditophora (5 827)
- Superclass Neodermata
- Superorder Macrostomorpha (293)
- Order Bothrioplanida (4)
- Order Fecampiida (18)
- Order Gnosonesimida (6)
- Order Polycladida (1 080)
- Suborder Acotylea (575)
- Superfamily Craspedommatidea Bock, 1913 accepted as Stylochoidea Poche, 1926
- Superfamily Cryptoceloidea Bahia, Padula & Schrödl, 2017 accepted as Discoceloidea Dittmann, Cuadrado, Aguado, Noreña & Egger, 2019 (23)
- Superfamily Discoceloidea Dittmann, Cuadrado, Aguado, Noreña & Egger, 2019 (58)
- Superfamily Emprosthommatidea Bock, 1913 accepted as Ilyplanoidea Faubel, 1984
- Superfamily Ilyplanoidea Faubel, 1984 accepted as Cryptoceloidea Bahia, Padula & Schrödl, 2017
- Superfamily Leptoplanoidea Faubel, 1984 (245)
- Family Candimboididae Faubel, 1983 (2)
- Family Faubelidae Özdikmen, 2010 (12)
- Family Gnesiocerotidae Marcus & Marcus, 1966 (7)
- Family Leptoplanidae Stimpson, 1857 (45)
- Subfamily Leptoplaninae Marcus, 1947 (1)
- Subfamily Stylochoplaninae Meixner, 1907
- Genus Bisacculosuteri Ramos-Sanchez, Bahia & Rolando Bastida-Zavala, 2019 (1)
- Genus Bivesiculoplana Pineda-López & González-Bulnes, 1984 (1)
- Genus Diplanaria Darwin, 1844 accepted as Leptoplana Ehrenberg, 1831
- Genus Indiplana Stummer-Traunfels, 1933 (1)
- Genus Itannia Marcus, 1947 (1)
- Genus Leptoplana Ehrenberg, 1831 (34)
- Species Leptoplana acticola Boone, 1929 accepted as Notocomplana acticola (Boone, 1929)
- Species Leptoplana acuta Stimpson, 1855
- Species Leptoplana affinis Stimpson, 1857 accepted as Prosthiostomum grande Stimpson, 1857
- Species Leptoplana alba Kelaart, 1858
- Species Leptoplana alba Schmidtlein, 1880 accepted as Cryptocelis alba (Schmidtlein, 1880)
- Species Leptoplana alba Lang, 1880 accepted as Cryptocelis alba (Schmidtlein, 1880)
- Species Leptoplana alcinoi Schmidt, 1862 accepted as Notoplana alcinoi (Schmidt, 1862)
- Species Leptoplana angusta Pearse, 1938 accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana angusta Pearse & Littler, 1938 accepted as Digynopora americana Hyman, 1940
- Species Leptoplana angusta Pearse & Littler, 1938 accepted as Euplana carolinensis Hyman, 1940
- Species Leptoplana angusta Verrill, 1893 accepted as Comoplana angusta (Verrill, 1893)
- Species Leptoplana arcta (Quatrefage, 1845) accepted as Prosthiostomum siphunculus (Delle Chiaje, 1822)
- Species Leptoplana atomata (Müller OF, 1776) accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana aurantiaca Collingwood, 1876 accepted as Prosthiostomum aurantiacum (Collingwood, 1876)
- Species Leptoplana australis Laidlaw, 1904 accepted as Notoplana australis (Schmarda, 1859)
- Species Leptoplana australis (Schmarda, 1859) accepted as Notoplana australis (Schmarda, 1859)
- Species Leptoplana bacteoalba Palombi, 1939 accepted as Armatoplana lactoalba (Verrill, 1900)
- Species Leptoplana badia (Stimpson, 1857) accepted as Notoplana australis (Schmarda, 1859)
- Species Leptoplana brunnea Cheeseman, 1882
- Species Leptoplana californica Plehn, 1898 accepted as Pleioplana californica (Plehn, 1898)
- Species Leptoplana capensis Schmarda, 1859
- Species Leptoplana cherchiae Plehn, 1896 accepted as Notocomplana chierchiae (Plehn, 1896)
- Species Leptoplana chierchiae Plehn, 1896 accepted as Notocomplana chierchiae (Plehn, 1896)
- Species Leptoplana chilensis Schmarda, 1859 accepted as Stylochoplana chilensis (Schmarda, 1859)
- Species Leptoplana chloranota (Boone, 1929) accepted as Stylochoplana chloranota (Boone, 1929)
- Species Leptoplana collaris Stimpson, 1855 accepted as Prosthiostomum collare (Stimpson, 1855)
- Species Leptoplana concolor Meixner, 1907 accepted as Euplanoida concolor (Meixner, 1907)
- Species Leptoplana constipata Stimpson, 1857 accepted as Prosthiostomum constipatum Stimpson, 1857
- Species Leptoplana crassiuscula (Stimpson, 1857) accepted as Prosthiostomum crassiusculum Stimpson, 1857
- Species Leptoplana cribraria (Stimpson, 1857) accepted as Prosthiostomum cribrarium Stimpson, 1857
- Species Leptoplana delicatula Stimpson, 1857
- Species Leptoplana diaphana Stummer-Traunfels, 1933
- Species Leptoplana discus Le Conte, 1851
- Species Leptoplana droebachensis Ørsted, 1845 accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana drowbachensis Hyman, 1940 accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana dubia (Schmarda, 1859) accepted as Notoplana dubia (Schmarda, 1859)
- Species Leptoplana ellipsis (Dalyell, 1853) accepted as Stylostomum ellipse (Dalyell, 1853)
- Species Leptoplana ellipsoides Girard in Stimpson, 1854 accepted as Plehnia ellipsoides (Girard in Stimpson, 1854)
- Species Leptoplana ellipsoides Verrill, 1893 accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana elongata Quatrefage, 1845 accepted as Prosthiostomum siphunculus (Delle Chiaje, 1822)
- Species Leptoplana erythrotaenia (Schmarda, 1859) accepted as Notocomplana erythrotaenia (Schmarda, 1859)
- Species Leptoplana fallax (Quatrefage, 1845) accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana ferruginea (Schmarda, 1859) accepted as Melloplana ferruginea (Schmarda, 1859)
- Species Leptoplana flexilis (Dalyell, 1814) accepted as Leptoplana tremellaris (Müller OF, 1773)
- Species Leptoplana folium Verrill & Smith, 1874 accepted as Trigonoporus folium (Verrill, 1873)
- Species Leptoplana formosa Darwin, 1844
- Species Leptoplana fulva Kelaart, 1858
- Species Leptoplana fusca Stimpson, 1857
- Species Leptoplana gardineri Laidlaw, 1904 accepted as Notocomplana gardineri (Laidlaw, 1904)
- Species Leptoplana genicotyla (Palombi, 1939) accepted as Stylochoplana genicotyla Palombi, 1939
- Species Leptoplana gigas Schmarda, 1859 accepted as Ilyella gigas (Schmarda, 1859)
- Species Leptoplana gracilis (Girard, 1850) accepted as Euplana gracilis Girard, 1853
- Species Leptoplana graffii Laidlaw, 1906 accepted as Stylochoplana graffi (Laidlaw, 1906)
- Species Leptoplana grandis (Stimpson, 1857) accepted as Prosthiostomum grande Stimpson, 1857
- Species Leptoplana haloglena (Schmarda, 1859) accepted as Notoplana haloglena (Schmarda, 1859)
- Species Leptoplana hamata (Schmidt, 1861) accepted as Prosthiostomum siphunculus (Delle Chiaje, 1822)
- Species Leptoplana humilis Stimpson, 1857 accepted as Notocomplana humilis (Stimpson, 1857)
- Species Leptoplana hyalina Ehrenberg, 1831 accepted as Leptoplana tremellaris (Müller OF, 1773)
- Species Leptoplana inconspicua Pease, 1860
- Species Leptoplana inquieta Heath & McGregor, 1912 accepted as Pleioplana inquieta (Heath & McGregor, 1912)
- Species Leptoplana irrorata Pease, 1860
- Species Leptoplana jaltensis Czerniavsky, 1881
- Species Leptoplana kuekenthalli Plehn, 1896 accepted as Notoplana kuekenthali (Plehn, 1896)
- Species Leptoplana kukenthali Plehn, 1896 accepted as Notoplana kuekenthali (Plehn, 1896)
- Species Leptoplana lactea (Stimpson, 1857) accepted as Ilyella gigas (Schmarda, 1859)
- Species Leptoplana lacteoalba Laidlaw, 1903 accepted as Armatoplana lactoalba (Verrill, 1900)
- Species Leptoplana lactoalba Verrill, 1900 accepted as Armatoplana lactoalba (Verrill, 1900)
- Species Leptoplana laevigatus (Quatrefage, 1845) accepted as Leptoplana tremellaris (Müller OF, 1773)
- Species Leptoplana lanceolata Schmarda, 1859 accepted as Stylochoplana chilensis (Schmarda, 1859)
- Species Leptoplana levigata (Quatrefage, 1845) accepted as Leptoplana tremellaris (Müller OF, 1773)
- Species Leptoplana lichenoides (Mertens, 1833) accepted as Discocelis lichenoides (Mertens, 1833)
- Species Leptoplana limnoriae Hyman, 1953 accepted as Stylochoplana limnoriae (Hyman, 1953)
- Species Leptoplana littoralis Morgan, 1905
- Species Leptoplana lutea Örsted, 1844 accepted as Planaria luteola Delle Chiaje, 1822
- Species Leptoplana lutea? Oersted, 1844 accepted as Planaria luteola Delle Chiaje, 1822
- Species Leptoplana luteola (Delle Chiaje, 1822) accepted as Planaria luteola Delle Chiaje, 1822
- Species Leptoplana lyrosora (Schmarda, 1859) accepted as Notocomplana erythrotaenia (Schmarda, 1859)
- Species Leptoplana macrorhyncha (Schmarda, 1859) accepted as Prosthiostomum macrorhynchum (Schmarda, 1859)
- Species Leptoplana macrosora Schmarda, 1859
- Species Leptoplana maculosa Stimpson, 1857
- Species Leptoplana malayana Laidlaw, 1903 accepted as Euplanoida malayana (Laidlaw, 1903)
- Species Leptoplana mediterranea Bock, 1913
- Species Leptoplana mertemsii (Claperede, 1861) accepted as Leptoplana mertensi Claparède, 1861
- Species Leptoplana mertensi Claparède, 1861
- Species Leptoplana microsora (Schmarda, 1859) accepted as Notocomplana microsora (Schmarda, 1859)
- Species Leptoplana modesta (Quatrefage, 1845) accepted as Emprosthopharynx pallida (Quatrefage, 1845)
- Species Leptoplana monosora Schmarda, 1859 accepted as Lurymare monosorum (Schmarda, 1859)
- Species Leptoplana moseleyi Lang, 1884
- Species Leptoplana nadiae Melouk, 1941 accepted as Stylochoplana nadiae (Melouk, 1941)
- Species Leptoplana nationalis Plehn, 1896 accepted as Notoplana atlantica (Plehn, 1896)
- Species Leptoplana nigripunctata Ørsted, 1844
- Species Leptoplana notabilis Darwin, 1844
- Species Leptoplana oblonga Stimpson, 1857
- Species Leptoplana obovata (Schmarda, 1859) accepted as Adenoplana obovata (Schmarda, 1859)
- Species Leptoplana obscura Stimpson, 1855 accepted as Prosthiostomum obscurum (Stimpson, 1855)
- Species Leptoplana obtusum (Collingwood, 1876)
- Species Leptoplana oosora (Schmarda, 1859) accepted as Indiplana oosora (Schmarda, 1859)
- Species Leptoplana ophryoglena Schmarda, 1859
- Species Leptoplana orbicularia (Schmarda, 1859) accepted as Postenterogonia orbicularis (Schmarda, 1859)
- Species Leptoplana orbicularis (Schmarda, 1859) accepted as Postenterogonia orbicularis (Schmarda, 1859)
- Species Leptoplana otophora Schmarda, 1859 accepted as Notocomplana otophora (Schmarda, 1859)
- Species Leptoplana pacificola Plehn, 1896 accepted as Euplanoida pacificola (Plehn, 1896)
- Species Leptoplana pallida (Quatrefage, 1845) accepted as Emprosthopharynx pallida (Quatrefage, 1845)
- Species Leptoplana panamensis Plehn, 1896 accepted as Stylochoplana panamensis (Plehn, 1896) Bock, 1913
- Species Leptoplana pardalis Laidlaw, 1902 accepted as Euplanoida pardalis (Laidlaw, 1902)
- Species Leptoplana patellarum Stimpson, 1855 accepted as Notocomplana erythrotaenia (Schmarda, 1859)
- Species Leptoplana patellensis Collingwood, 1876 accepted as Notocomplana erythrotaenia (Schmarda, 1859)
- Species Leptoplana pellucida Grube, 1840 accepted as Prosthiostomum pellucidum (Grube, 1840)
- Species Leptoplana polycyclia Schmarda, 1859
- Species Leptoplana polysora (Schmarda, 1859) accepted as Leptostylochus polysorus (Schmarda, 1859)
- Species Leptoplana punctata Stimpson, 1857
- Species Leptoplana punctata (Kelaart, 1858) accepted as Centrostomum punctatum (Kelaart, 1858)
- Species Leptoplana purpurea Schmarda, 1859 accepted as Ilyella purpurea Stummer-Traunfels, 1933
- Species Leptoplana rupicola Heath & McGregor, 1912 accepted as Notocomplana rupicola (Heath & McGregor, 1912)
- Species Leptoplana saxicola Heath & McGregor, 1912 accepted as Notocomplana saxicola (Heath & McGregor, 1912)
- Species Leptoplana schizoporellae Hallez, 1893
- Species Leptoplana schoenbornii Stimpson, 1857 accepted as Leptoplana schonbornii Stimpson, 1857
- Species Leptoplana schonbornii Stimpson, 1857
- Species Leptoplana sciophila Boone, 1929 accepted as Notocomplana sciophila (Boone, 1929)
- Species Leptoplana sparsa Stimpson, 1855 accepted as Cycloporus variegatus Kato, 1934
- Species Leptoplana stimpsoni Diesing, 1862 accepted as Notoplana australis (Schmarda, 1859)
- Species Leptoplana striata Schmarda, 1859
- Species Leptoplana subauriculata (Johnston, 1836) accepted as Stylochoplana maculata (Quatrefage, 1845)
- Species Leptoplana subviridis Plehn, 1896 accepted as Ilyella gigas (Schmarda, 1859)
- Species Leptoplana suteri Jacubowa, 1906 accepted as Notoplana suteri (Jacubowa, 1906)
- Species Leptoplana taenia Schmarda, 1859
- Species Leptoplana tenebrosa (Stimpson, 1857)
- Species Leptoplana tenella Stimpson, 1857
- Species Leptoplana tigrina (Blanchard, 1847) accepted as Discocelis tigrina (Blanchard, 1847)
- Species Leptoplana timida Heath & McGregor, 1912 accepted as Notocomplana timida (Heath & McGregor, 1912)
- Species Leptoplana trapezoglena (Schmarda, 1859)
- Species Leptoplana tremellaris (Müller OF, 1773)
- Species Leptoplana trullaeformis Stimpson, 1855
- Species Leptoplana tuba Grube, 1871 accepted as Prosthiostomum grande Stimpson, 1857
- Species Leptoplana variabilis (Girard, 1850) accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana vesiculata Hyman, 1939
- Species Leptoplana virilis Verrill, 1893 accepted as Pleioplana atomata (Müller OF, 1776)
- Species Leptoplana vitrea Lang, 1884 accepted as Notoplana vitrea (Lang, 1884)
- Genus Leptoplanella Faubel, 1983 (1)
- Genus Longiprostatum Hyman, 1953 (1)
- Genus Parviplana Hyman, 1953 (4)
- Family Mucroplanidae Faubel, 1983 (1)
- Family Notocirridae Faubel, 1983 accepted as Faubelidae Özdikmen, 2010
- Family Notocomplanidae Litvaitis, Bolaños & Quiroga, 2019 (33)
- Family Notoplanidae Marcus & Marcus, 1966 (39)
- Family Palauidae Faubel, 1983
- Family Pleioplanidae Faubel, 1983 (11)
- Family Pseudostylochidae Faubel, 1983 (17)
- Family Stylochoplanidae Faubel, 1983 (78)
- Superfamily Planoceroidea Poche, 1925 accepted as Stylochoidea Poche, 1926
- Superfamily Schematommatidea Bock, 1913 accepted as Leptoplanoidea Faubel, 1984
- Superfamily Stylochoidea Poche, 1926 (211)
- Family Anocellidae Quiroga, Bolanos & Litvaitis, 2006 (1)
- Family Apidioplanidae Bock, 1926 (4)
- Family Didangiidae Faubel, 1983 (2)
- Family Enantiidae Graff, 1889 (2)
- Family Euplanidae Marcus & Marcus, 1966 (20)
- Family Limnostylochidae Faubel, 1983 (3)
- Family Stylochocestidae Bock, 1913 (6)
- Suborder Acotylina accepted as Acotylea
- Suborder Cotylea (505)
- Genus Platydendron Simonetta & Delle-Cave, 1978 †
- Order Prolecithophora (201)
- Order Prorhynchida (30)
- Order Proseriata (514)
- Order Rhabdocoela (1 814)
- Order Tricladida (1 867)
- Class Turbellaria