| Sphalloplana percoeca (Packard, 1879) | | - | latest taxonomic authority | 4 |
| Girardia aurita (Kennel, 1888) | [with synonyms] | w | latest taxonomic authority | |
| Polycelis Polycelis Ehrenberg, 1831 | | w | latest taxonomic authority | 4 |
| Polycelis (Polycelis) coronata coronata (Girard, 1891) | [with synonyms] | w | latest taxonomic authority | 4 |
| Polycelis (Polycelis) coronata monticola Kenk & Hampton, 1982 | [with synonyms] | w | latest taxonomic authority | 4 |
| Polycelis monticola Kenk & Hampton, 1982 | | w | latest taxonomic authority | |
| Planaria simplex Woodworth, 1896 | | w | latest taxonomic authority | 6 |
| Cura foremanii (Girard, 1852) | [with synonyms] | w | latest taxonomic authority | 1 |
| Dugesia tigrina (Girard, 1850) | | w | latest taxonomic authority | 1 |
| Dugesiidae Dugesia Girard, 1850 | [with synonyms] | w | latest taxonomic authority | 2 |
| Dugesia dorotocephala (Woodworth, 1897) | | w | latest taxonomic authority | 2 |
| Girardia arizonensis Kenk, 1975 | | w | latest taxonomic authority | 2 |
| Dugesia jenkinsae Benazzi & Gourbault, 1977 | | w | latest taxonomic authority | 2 |
| Girardia azteca (Benazzi & Giannini, 1971) | [with synonyms] | w | latest taxonomic authority | 2 |
| Girardia typhlomexicana (Mitchell & Kawakatsu, 1973) | [with synonyms] | w | latest taxonomic authority | 2 |
| Dugesia typhlomexicana Mitchell & Kawakatsu, 1973 | | w | latest taxonomic authority | 2 |
| Dugesia guatemalensis Mitchell & Kawakatsu, 1973 | | w | latest taxonomic authority | |
| Girardia guatemalensis (Mitchell & Kawakatsu, 1973) | [with synonyms] | w | latest taxonomic authority | 2 |
| Girardia mckenziei (Mitchell & Kawakatsu, 1973) | [with synonyms] | w | latest taxonomic authority | 2 |
| Dugesia festae Borelli, 1898 | | w | latest taxonomic authority | 2 |
| Planaria aurita Kennel, 1888 | | w | latest taxonomic authority | 2 |
| Girardia arimana (Hyman, 1957) | [with synonyms] | w | latest taxonomic authority | 2 |
| Dugesia arimana Hyman, 1957 | | w | other taxonomic work | 2 |
| Girardia miltgeni (Gourbault, 1980) | | w | other taxonomic work | 2 |
| Girardia antillana Kenk, 1941 | [with synonyms] | w | latest taxonomic authority | 2 |
| Dugesia cubana Codreanu & Balcesco, 1973 | | w | latest taxonomic authority | 2 |
| Girardia cubana Codreanu & Balcesco, 1973 | [with synonyms] | w | latest taxonomic authority | 2 |
| Planariidae Phagocata Leidy, 1847 | [with synonyms] | w | latest taxonomic authority | 2-3 |
| Phagocata velata (Stringer, 1909) | [with synonyms] | w | latest taxonomic authority | 2 |
| Phagocata fawcetti Ball & Gourbault, 1975 | | w | latest taxonomic authority | 2 |
| Phagocata virilis Kenk, 1977 | | w | latest taxonomic authority | 2 |
| Phagocata bulbosa Kenk, 1970 | | w | latest taxonomic authority | 2-3 |
| Phagocata crenophila Carpenter, 1969 | | w | latest taxonomic authority | 3 |
| Phagocata tahoena Kawakatsu, 1968 | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata hamptonae Kenk, 1982 | | w | latest taxonomic authority | 3 |
| Phagocata oregonensis Hyman, 1963 | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata nivea Kenk, 1953 | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata morgani (Stevens & Boring, 1906) | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata morgani morgani Stevens & Boring, 1906 | [with synonyms] | w | other taxonomic work | 3 |
| Phagocata morgani polycelis (Kenk, 1935) | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata spuria Kenk, 1987 | | w | latest taxonomic authority | 3 |
| Phagocata angusta Kenk, 1977 | | w | latest taxonomic authority | 3 |
| Phagocata holleri Kenk, 1979 | | w | latest taxonomic authority | 3 |
| Phagocata carolinensis Kenk, 1979 | | w | latest taxonomic authority | 3 |
| Phagocata pygmaea Kenk, 1987 | | w | latest taxonomic authority | 3 |
| Phagocata procera Kenk, 1984 | | w | latest taxonomic authority | 3 |
| Phagocata bursaperforata Darlington, 1959 | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata notorchis Kenk, 1987 | | w | other taxonomic work | 3 |
| Phagocata gracilis (Haldeman, 1840) | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata woodworthi Hyman, 1937 | [with synonyms] | w | latest taxonomic authority | 3 |
| Phagocata nordeni Kenk, 1977 | | w | latest taxonomic authority | 3 |
| Planariidae Hymanella Castle, 1941 | | w | latest taxonomic authority | 3 |
| Hymanella retenuova Castle, 1941 | | w | latest taxonomic authority | 3 |
| Paraplanaria dactyligera (Kenk, 1935) | [with synonyms] | w | latest taxonomic authority | 4 |
| Planaria dactyligera musculosa Kenk, 1969 | | w | latest taxonomic authority | 4 |
| Planaria dactyligera dactyligera Kenk, 1935 | | w | latest taxonomic authority | 4 |
| Planariidae Planaria Müller, 1776 | | w | other taxonomic work | |
| Tricladida Paludicola Hallez, 1892 | | w | latest taxonomic authority | |
| Planaria occulta Kenk, 1969 | | w | latest taxonomic authority | 4 |
| Paraplanaria occulta (Kenk, 1969) | [with synonyms] | w | latest taxonomic authority | 4 |
| Polycelis (Polycelis) coronata (Girard, 1891) | [with synonyms] | w | latest taxonomic authority | 4 |
| Polycelis (Polycelis) coronata brevipenis Kenk, 1972 | [with synonyms] | w | latest taxonomic authority | 4 |
| Planariidae Seidlia Zabusov, 1911 | [with synonyms] | w | latest taxonomic authority | 4 |
| Seidlia sierrensis (Kenk, 1973) | | w | latest taxonomic authority | 4 |
| Dendrocoelidae Kenkiinae Hyman, 1937 | | w | latest taxonomic authority | 4-5 |
| Sphalloplana Sphalloplana de Beauchamp, 1931 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) percoeca (Packard, 1879) | [with synonyms] | w | latest taxonomic authority | 4 |
| Fonticola percaeca (Packard, 1879) | | w | latest taxonomic authority | 4 |
| Fonticola percoecum (Packard, 1879) | | w | other taxonomic work | 4 |
| Dendrocoelum percoecum Packard, 1879 | | w | other taxonomic work | 4 |
| Sphalloplana (Sphalloplana) georgiana Hyman, 1954 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) evaginata Kenk, 1977 | | w | other taxonomic work | 4 |
| Sphalloplana (Speophila) holsingeri Kenk, 1977 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) kansensis Hyman, 1945 | | w | other taxonomic work | 4 |
| Sphalloplana (Sphalloplana) californica Kenk, 1977 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) culveri Kenk, 1977 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) consimilis Kenk, 1977 | | w | latest taxonomic authority | 4 |
| Sphalloplana (Sphalloplana) subtilis Kenk, 1977 | | w | latest taxonomic authority | 4 |
| Sphalloplana Speophila Hyman, 1937 | | w | latest taxonomic authority | 4-5 |
| Sphalloplana virginiana Hyman, 1945 | | - | latest taxonomic authority | 4 |
| Sphalloplana (Speophila) hypogea Kenk, 1984 | [with synonyms] | w | latest taxonomic authority | 5 |
| Sphalloplana (Speophila) hoffmasteri Hyman, 1954 | [with synonyms] | w | latest taxonomic authority | 5 |
| Sphalloplana Polypharyngea Carpenter, 1971 | | w | latest taxonomic authority | 5 |
| Sphalloplana (Polypharyngea) mohri (Hyman, 1938) | | w | latest taxonomic authority | 5 |
| Kenkiidae Kenkia Hyman, 1937 | [with synonyms] | w | latest taxonomic authority | 5 |
| Kenkia rhynchida Hyman, 1937 | | w | latest taxonomic authority | 5 |
| Kenkia glandulosa (Hyman, 1956) | [with synonyms] | w | latest taxonomic authority | 5 |
| Kenkia lewisi (Kenk, 1975) | [with synonyms] | w | latest taxonomic authority | |
| Planarioidea Dendrocoelidae Hallez, 1892 | | w | other taxonomic work | 5-6 |
| Dendrocoelidae Dendrocoelinae Hallez, 1892 | | w | other taxonomic work | 5-6 |
| Dendrocoelidae Dendrocoelopsis Kenk, 1930 | | w | other taxonomic work | 5-6 |
| Dendrocoelopsis vaginata Hyman, 1935 | | w | latest taxonomic authority | 5 |
| Dendrocoelopsis piriformis Kenk, 1953 | | w | latest taxonomic authority | 5 |
| Dendrocoelopsis alaskensis Kenk, 1953 | | w | latest taxonomic authority | 5 |
| Dendrocoelopsis hymanae Kawakatsu, 1968 | | w | latest taxonomic authority | 5 |
| Dendrocoelopsis americana (Hyman, 1939) | | w | other taxonomic work | 5 |
| Dendrocoelidae Procotyla Leidy, 1857 | | w | latest taxonomic authority | 5-6 |
| Procotyla fluviatilis Leidy, 1857 | [with synonyms] | w | latest taxonomic authority | 5 |
| Procotyla typhlops Kenk, 1935 | | w | latest taxonomic authority | 5 |
| Dendrocoelidae Rectocephala Hyman, 1953 | | w | latest taxonomic authority | 5-6 |
| Rectocephala exotica Hyman, 1953 | [with synonyms] | w | latest taxonomic authority | 5-6 |
| Planaria fissipara Kennel, 1888 | | w | latest taxonomic authority | 6 |
| Hydrolimax bruneus Girard, 1891 | | w | latest taxonomic authority | 6 |
| Planaria fuliginosus Leidy, 1852 | | w | latest taxonomic authority | 6 |
| Planaria unionicola Woodworth, 1897 | | w | latest taxonomic authority | 6 |