Bothromesostoma esseni accepted as Bothromesostoma essenii Braun, 1885 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma essenii Braun, 1885 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma evelinae Marcus, 1946
Bothromesostoma lineata accepted as Bothromesostoma lineatum Braun, 1885 accepted as Bothromesostoma essenii Braun, 1885 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma lineatum Braun, 1885 accepted as Bothromesostoma essenii Braun, 1885 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma marginatum Braun, 1885 accepted as Bothromesostoma essenii Braun, 1885 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
Bothromesostoma pieti Marcus, 1960
Bothromesostoma primitivum Sabussowa, 1929 accepted as Mesostoma primitivum (Sabussowa, 1929) Marcus, 1946
Bothromesostoma truncatum Beklemischev, 1921
Marcomesostoma evelinae (Marcus, 1955) Noreña Janssen & Faubel, 1992
Mesostoma africanum Kolasa, 1976
Mesostoma ajpetri Nasonov, 1923 (uncertain > nomen dubium )
Mesostoma andicola (Schmarda, 1859) Graff, 1882 (uncertain > nomen dubium )
Mesostoma andrewsi Hyman, 1957 accepted as Mesostoma platygastricum Hofsten, 1924
Mesostoma angulare Higley, 1918 (uncertain > nomen dubium )
Mesostoma antarcticum Dreyer, 1918 accepted as Mesostoma mutabile Bohmig, 1902
Mesostoma appia Kolasa, 1984 (unaccepted > nomen nudum )
Mesostoma appinum Kolasa & Schwartz, 1988
Mesostoma arctica Hyman, 1938 accepted as Mesostoma arcticum Hyman, 1938
Mesostoma arcticum Hyman, 1938
Mesostoma armatum Fuhrmann, 1894 accepted as Castrada (Castrada) armata (Fuhrmann, 1894) Luther, 1904
Mesostoma armeniacum Plotnikow, 1906 (uncertain > nomen dubium )
Mesostoma aselli Kennel, 1898 accepted as Castrada (Castradella) granea Braun, 1885
Mesostoma auditivum Forel & du Plessis, 1874 accepted as Otomesostoma auditivum (Forel & Du Plessis, 1874) Hofsten, 1907
Mesostoma balatonicum Szigethy, 1897 (uncertain > nomen dubium )
Mesostoma banaticum Graff, 1875 accepted as Olisthanella truncula (Schmidt, 1858) Voigt, 1892
Mesostoma baoensis Ruebush, 1939 accepted as Mesostoma lingua baoensis Ruebush, 1939 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma benazii accepted as Mesostoma benazzii Papi, 1949
Mesostoma benazzii Papi, 1949
Mesostoma bistrigatum (Fabricius, 1826) Diesing, 1850 (uncertain > nomen dubium )
Mesostoma bologoviense Plotnikow, 1906 accepted as Strongylostoma elongatum elongatum Hofsten, 1907
Mesostoma brincki Marcus, 1970
Mesostoma californicum Hyman, 1957
Mesostoma canum Weiss, 1909
Mesostoma chromobactrum Braun, 1885 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma chromobractrum accepted as Mesostoma chromobactrum Braun, 1885 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma chusholense Ruebush, 1939
Mesostoma climenti Nasonov, 1923 (uncertain > nomen dubium )
Mesostoma coecum Silliman, 1885 accepted as Olisthanella coeca (Silliman, 1885) Luther, 1904
Mesostoma columbianum Hyman, 1939
Mesostoma craci Schmidt, 1858
Mesostoma cracii accepted as Mesostoma craci Schmidt, 1858
Mesostoma cracy accepted as Mesostoma craci Schmidt, 1858
Mesostoma cuenoti Dörler, 1900 accepted as Castrada (Castrada) cuenoti (Dörler, 1900) Luther, 1904 accepted as Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904
Mesostoma curvipenis Hyman, 1955
Mesostoma cyathus Schmidt, 1858 accepted as Mesostoma chromobactrum Braun, 1885 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma cycloposthe Dorner, 1902 accepted as Castrada (Castrada) armata (Fuhrmann, 1894) Luther, 1904
Mesostoma delmarmola Vendrix, 1963 (uncertain > unassessed )
Mesostoma ehrenbergi accepted as Mesostoma ehrenbergii (Focke, 1836) Örsted, 1843
Mesostoma ehrenbergii (Focke, 1836) Örsted, 1843
Mesostoma ehrenbergii wardii Woodworth, 1896 accepted as Mesostoma ehrenbergii (Focke, 1836) Örsted, 1843
Mesostoma evelinae Marcus, 1955 accepted as Marcomesostoma evelinae (Marcus, 1955) Noreña Janssen & Faubel, 1992
Mesostoma ewerum Du Bois-Reymond Marcus, 1951
Mesostoma exiguum Dorner, 1902 accepted as Olisthanella exigua (Dorner, 1902) Luther, 1904
Mesostoma extremeniense Noreña, Campo & Real, 1999
Mesostoma flavidum Graff, 1882 accepted as Castrada (Castrada) flavida (Graff, 1882) Luther, 1904
Mesostoma fusiforme (Duges, 1830) Ehrenberg, 1836 (uncertain > nomen dubium )
Mesostoma gangetica Dutta, 1925 (uncertain > nomen dubium )
Mesostoma georgianum Darlington, 1959
Mesostoma gonocephalum Silliman, 1884 accepted as Strongylostoma gonocephalum (Silliman, 1884) Graff, 1911
Mesostoma gracile (Schmarda, 1859) Graff, 1882 (uncertain > nomen dubium )
Mesostoma griseum (Müller, 1789) Graff, 1882 (uncertain > nomen dubium )
Mesostoma grossum (Müller, 1774) Ehrenberg, 1836 accepted as Mesostoma productum (Schmidt, 1848) Leuckart, 1854
Mesostoma hallezianum Vejdovsky, 1880 accepted as Olisthanella halleziana (Vejdovsky, 1880) Sekera, 1906 accepted as Typhloplanella halleziana (Vejdovsky, 1880) Sekera, 1911
Mesostoma herclotsiannum accepted as Mesostoma herklotsianum de Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843
Mesostoma herclotsianum accepted as Mesostoma herklotsianum de Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843
Mesostoma herklotsianum de Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843
Mesostoma hirudo Schmidt, 1858 accepted as Castrada (Castrada) hirudo (Schmidt, 1858) Hofsten, 1907
Mesostoma hystrix Schmarda, 1859 (uncertain > nomen dubium )
Mesostoma inversum Beauchamp, 1954 accepted as Mesostoma productum (Schmidt, 1848) Leuckart, 1854
Mesostoma jilinense Wang & Huang, 2923
Mesostoma karrooense Dreyer, 1914 (uncertain > taxon inquirendum )
Mesostoma lacteum Neppi, 1904 (uncertain > nomen dubium )
Mesostoma lanceola Braun, 1885 accepted as Castrada (Castrada) lanceola (Braun, 1885) Luther, 1904
Mesostoma lapponicum Schmidt, 1852 accepted as Mesostoma viridatum (Abildgaard, 1789) Schultze, 1851 accepted as Typhloplana viridata (Abildgaard, 1789) Ehrenberg, 1831
Mesostoma lenticulatum accepted as Mesostomum lenticulatum Schmidt, 1852 accepted as Turbella lenticulata (Schmidt, 1852) Diesing, 1862 accepted as Promesostoma lenticulatum (Schmidt, 1852) Graff, 1882 accepted as Beauchampiella lenticulata (Schmidt, 1852) Karling, 1956 accepted as Beauchampiola lenticulata (Schmidt, 1852) Luther, 1957
Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma lingua baoensis Ruebush, 1939 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma lingua cyathus Schmidt, 1858 accepted as Mesostoma cyathus Schmidt, 1858 accepted as Mesostoma chromobactrum Braun, 1885 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma lingua lacustris Brinkmann, 1905 (uncertain > nomen dubium )
Mesostoma lingua lingua (Abildgaard, 1789) Schmidt, 1848 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma lingua typica Brinkmann, 1906 accepted as Mesostoma lingua lingua (Abildgaard, 1789) Schmidt, 1848 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
Mesostoma lugdunense De Man, 1875 (uncertain > nomen dubium )
Mesostoma macropenis Hyman, 1939
Mesostoma macroprostatum Hyman, 1939
Mesostoma maculatum Hofsten, 1917
Mesostoma magnum Kolasa & Schwartz, 1988
Mesostoma marmorosum (Müller, 1773) Örsted, 1844 accepted as Mesostoma robertsonii Graff, 1882 accepted as Tetracelis marmorosa (Müller, 1774) Ehrenberg, 1831
Mesostoma masovicum Dorner, 1902 (uncertain > nomen dubium )
Mesostoma metopoglea accepted as Mesostoma metopoglena (Schmarda, 1859)
Mesostoma metopoglena (Schmarda, 1859) (uncertain > nomen dubium )
Mesostoma michaelseni Weiss, 1909
Mesostoma minimum Fuhrmann, 1894 accepted as Typhloplana minima (Fuhrmann, 1894) Luther, 1904
Mesostoma morgiense du Plessis, 1876 accepted as Monotus morgiensis (du Plessis, 1876) du Plessis, 1885 accepted as Automolos morgiensis (Du Plessis, 1876) Braun, 1885 accepted as Otomesostoma auditivum (Forel & Du Plessis, 1874) Hofsten, 1907
Mesostoma murmanicum Nasonov, 1923 (uncertain > taxon inquirendum )
Mesostoma mutabile Bohmig, 1902
Mesostoma nassanoffii accepted as Mesostoma nassonoffii Graff, 1882 accepted as Olisthanella nassonoffii (Graff, 1882) Luther, 1904 accepted as Olisthanella truncula nassonoffii (Graff, 1882) Luther, 1904
Mesostoma nassonoffii Graff, 1882 accepted as Olisthanella nassonoffii (Graff, 1882) Luther, 1904 accepted as Olisthanella truncula nassonoffii (Graff, 1882) Luther, 1904
Mesostoma neopolitanum Graff, 1882 accepted as Paramesostoma neapolitanum (Graff, 1882) Attems, 1896