• Acicula bioculata Renier, 1847 accepted as Acicula macula ([Renier], [1804])
• Acicula macula ([Renier], [1804]) (uncertain > taxon inquirendum)
• Ascaris flustrae Dalyell, 1853 (uncertain > nomen dubium)
• Ascaris linearis (Rathke, 1799) accepted as Cephalothrix linearis (Rathke, 1799)
• Ascaris longissima Gunnerus, 1770 accepted as Lineus longissimus (Gunnerus, 1770)
• Ascaris pelagica Gunnerus, 1770 (uncertain > taxon inquirendum)
• Ascaris rubra (Müller, 1774) accepted as Lineus ruber (Müller, 1774)
• Cephalonema brunniceps Stimpson, 1857 (uncertain > nomen dubium)
• Chloraima siculum Kölliker, 1845 (uncertain > nomen dubium)
• Legnodesmus ehlersi Howell, 1958 †
• Lobilabrum ostrearium Blainville, 1828 (uncertain > taxon inquirendum)
• Meckelia albo-vittata Simpson, 1855 accepted as Notospermus albovittatus (Stimpson, 1855)
• Meckelia albula Stimpson, 1857 accepted as Cerebratulus albulus (Stimpson, 1857)
• Meckelia angulata (Müller, 1774) accepted as Amphiporus angulatus (Müller, 1774)
• Meckelia annulata Grube, 1840 accepted as Notospermus annulatus (Grube, 1840)
• Meckelia asulcata McIntosh, 1874
• Meckelia atra Girard, 1851 accepted as Dushia atra (Girard, 1851) sensu Girard, 1851
• Meckelia atrocaerulea Schmarda, 1859 accepted as Lineus atrocaeruleus (Schmarda, 1859)
• Meckelia atrocaeruleus accepted as Lineus atrocaeruleus (Schmarda, 1859)
• Meckelia aurantiaca Grube, 1855 accepted as Leucocephalonemertes aurantiaca (Grube, 1855)
• Meckelia australis Stimpson, 1857 accepted as Cerebratulus australis (Stimpson, 1857)
• Meckelia beattiaei (Gray, 1857) accepted as Lineus beattiaei Gray, 1857 accepted as Cerebratulus marginatus [Renier], [1804]
• Meckelia bella accepted as Micrura bella (Stimpson, 1857)
• Meckelia bilineata (Renier, 1804) accepted as Lineus bilineatus (Renier, 1804) accepted as Siphonenteron bilineatum Renier in Menighini, 1847
• Meckelia borealis Diesing, 1862 accepted as Cerebratulus borealis (Diesing, 1862)
• Meckelia borlasii (Cuvier, 1816) accepted as Lineus longissimus (Gunnerus, 1770)
• Meckelia capensis Diesing, 1862 accepted as Meckelia macrorrhochma Schmarda, 1859 accepted as Cerebratulus macrorrhochmus (Schmarda, 1859)
• Meckelia carmellina (Quatrefages, 1846) accepted as Borlasia carmellina Quatrefages, 1846 accepted as Baseodiscus delineatus (Delle Chiaje, 1822)
• Meckelia carnea (Rathke, 1799) accepted as Lineus ruber (Müller, 1774)
• Meckelia cerebratulus Diesing, 1850 (unaccepted > unavailable name)
• Meckelia ceylanica Schmarda, 1859 accepted as Micrura ceylanica (Schmarda, 1859)
• Meckelia cingulata Stimpson, 1855 accepted as Lineus cingulatus (Stimpson, 1855)
• Meckelia coeca Örsted, 1845 (uncertain > nomen dubium)
• Meckelia depressa (Quatrefages, 1846) accepted as Cerebratulus depressus Quatrefages, 1846
• Meckelia ehrenbergii Diesing, 1850 (unaccepted > unavailable name)
• Meckelia erythrorochma (Joubin, 1902) accepted as Cerebratulus erythrorochma Joubin, 1902
• Meckelia fasciata (Stimpson, 1857) accepted as Cerebratulus fasciatus Stimpson, 1857 accepted as Notospermus geniculatus (Delle Chiaje, 1822)
• Meckelia fasciatus accepted as Cerebratulus fasciatus Stimpson, 1857 accepted as Notospermus geniculatus (Delle Chiaje, 1822)
• Meckelia fragilis Girard, 1851 accepted as Micrura leidyi (Verrill, 1892)
• Meckelia fusca (Fabricius, 1780) accepted as Nemertes fusca (Fabricius, 1780) accepted as Lineus ruber (Müller, 1774)
• Meckelia gracilis (Goodsir, 1845) accepted as Emplectonema gracile (Johnston, 1837)
• Meckelia gracilis Johnston, 1837 accepted as Nemertes gracilis Johnston, 1837 accepted as Emplectonema gracile (Johnston, 1837)
• Meckelia impressa accepted as Micrura impressa (Stimpson, 1857)
• Meckelia ingens Leidy, 1855 accepted as Cerebratulus lacteus (Leidy, 1851)
• Meckelia knerii Diesing, 1850 accepted as Cerebratulus knerii (Diesing, 1850) accepted as Notospermus geniculatus (Delle Chiaje, 1822)
• Meckelia lactea Leidy, 1851 accepted as Cerebratulus lacteus (Leidy, 1851)
• Meckelia leuckarti Diesing, 1862 accepted as Cerebratulus annellatus (Leuckart, 1849)
• Meckelia ligurica accepted as Cerebratulus liguricus Blanchard, 1849
• Meckelia lizziae Girard, 1853 accepted as Cerebratulus lacteus (Leidy, 1851)
• Meckelia lurida Verrill, 1873 accepted as Tarrhomyos luridus (Verrill, 1873)
• Meckelia macrorrhochma Schmarda, 1859 accepted as Cerebratulus macrorrhochmus (Schmarda, 1859)
• Meckelia macrostoma Schmarda, 1859 accepted as Cerebratulus macrostomus (Schmarda, 1859)
• Meckelia nigra Stimpson, 1855 accepted as Cerebratulus nigrus (Stimpson, 1855) accepted as Dushia nigra (Stimpson, 1855)
• Meckelia nigrofusca accepted as Lineus nigrofuscus (Stimpson, 1857)
• Meckelia oerstedii (van Beneden, 1861) accepted as Lineus bilineatus (Renier, 1804) accepted as Siphonenteron bilineatum Renier in Menighini, 1847
• Meckelia olivacea Rathke, 1843
• Meckelia olivacea Stimpson, 1855 accepted as Cerebratulus oleaginus Stimpson, 1857
• Meckelia pallida Diesing, 1850 (uncertain > nomen dubium)
• Meckelia paludicola accepted as Cerebratulus paludicolus Stimpson, 1857
• Meckelia piperata Stimpson, 1855 accepted as Iwatanemertes piperata (Stimpson, 1855)
• Meckelia pocohontas Girard, 1853 accepted as Cerebratulus lacteus (Leidy, 1851)
• Meckelia rosea Leidy, 1851 accepted as Micrura leidyi (Verrill, 1892)
• Meckelia rubella Stimpson, 1855 accepted as Cerebratulus rubellus (Stimpson, 1855)
• Meckelia serpentaria Diesing, 1850 accepted as Cerebratulus marginatus [Renier], [1804]
• Meckelia sinensis Stimpson, 1855 accepted as Cerebratulus sinensis (Stimpson, 1855)
• Meckelia siphunculus (Delle Chiaje, 1825) accepted as Cerebratulus marginatus [Renier], [1804]
• Meckelia somatotomus Leuckart, 1828 accepted as Cerebratulus marginatus [Renier], [1804]
• Meckelia striata Schmarda, 1859 accepted as Myorhynchonemertes striata (Schmarda, 1859)
• Meckelia striolenta (Girard, 1853) accepted as Cerebratulus striolenta (Gerard, 1853) accepted as Cerebratulus striolentus (Girard, 1853)
• Meckelia subacuta Stimpson, 1857 accepted as Cerebratulus subacutus (Stimpson, 1857)
• Meckelia taenia (Dalyell, 1853) accepted as Lineus bilineatus (Renier, 1804) accepted as Siphonenteron bilineatum Renier in Menighini, 1847
• Meckelia trigonocephala Schmarda, 1859 accepted as Micrura trigonocephala (Schmarda, 1859)
• Meckelia trilineata accepted as Tubulanus annulatus (Montagu, 1804)
• Meckelia urticans Müller, 1854 accepted as Cerebratulus urticans (Müller, 1854)
• Meckelia viridis accepted as Notospermus tricuspidatus (Quoy & Gaimard, 1833)
• Meckelia vittata (Quoy & Gaimard, 1833) accepted as Lineus vittatus (Quoy & Gaimard, 1833)
• Meckelia vittata var. violacea accepted as Lineus vittatus (Quoy & Gaimard, 1833)
• Nemertites ollivantii MacLeay, 1839 †
• Ophyocephalus bilineata accepted as Cerebratulus marginatus [Renier], [1804]
• Ophyocephalus bilineatus accepted as Cerebratulus marginatus [Renier], [1804]
• Ophyocephalus murenoides Delle Chiaje, 1829 (uncertain > nomen dubium)
• Ophyocephalus polymorphus accepted as Tubulanus polymorphus [Renier], [1804]
• Pararhynchoscolex lacustris Czerniavsky, 1880 (uncertain > nomen dubium)
• Planaria alba Dalyell, 1853 (uncertain > nomen dubium)
• Planaria algae Dalyell, 1853 accepted as Tetrastemma algae (Dalyell, 1853) accepted as Tetrastemma candidum (Müller, 1774)
• Planaria angulata (Müller, 1774) accepted as Fasciola angulata Müller, 1774 accepted as Amphiporus angulatus (Müller, 1774)
• Planaria ascaridea Montagu, 1808 accepted as Tetrastemma melanocephalum (Johnston, 1837)
• Planaria atropurpurea Rathke, 1799 (uncertain > nomen dubium)
• Planaria badia Rathke, 1799 accepted as Nemertes badia (Rathke, 1799) accepted as Drepanophorus spectabilis (Quatrefages, 1846)
• Planaria bioculata Johnston, 1828 (uncertain > taxon inquirendum)
• Planaria candida Müller, 1774 accepted as Fasciola candida Müller, 1774 accepted as Tetrastemma candidum (Müller, 1774)
• Planaria carnea Rathke, 1799 accepted as Lineus ruber (Müller, 1774)
• Planaria dorsalis Abildgaard, 1806 accepted as Oerstedia dorsalis (Abildgaard, 1806)
• Planaria filaris Müller, 1780 accepted as Micrura filaris (Müller, 1780)
• Planaria filiformis Johnston, 1828 accepted as Cephalothrix filiformis (Johnston, 1828)
• Planaria flaccida sensu Johnston, 1828
• Planaria flava Montagu, 1808 accepted as Prosorhochmus claparedii Keferstein, 1862
• Planaria fusca Fabricius, 1780 accepted as Meckelia fusca (Fabricius, 1780) accepted as Nemertes fusca (Fabricius, 1780) accepted as Lineus ruber (Müller, 1774)
• Planaria fuscescens Fabricius, 1798 accepted as Cerebratulus fuscescens accepted as Lineus ruber (Müller, 1774)
• Planaria gordius accepted as Astemma gordius Parfitt, 1867 accepted as Oerstedia dorsalis (Abildgaard, 1806)