1. Species Mesostomum agile Levinsen, 1879 accepted as Promesostoma agile (Levinsen, 1879) Graff, 1882 accepted as Maehrenthalia agilis (Levinsen, 1879) Graff, 1905
2. Species Mesostomum assimile (Ørsted, 1843) Schultze, 1851 accepted as Mesostoma fusiforme (Duges, 1830) Ehrenberg, 1836 (unaccepted > junior subjective synonym)
3. Species Mesostomum auditivum Forel & du Plessis, 1874 accepted as Mesostoma auditivum Forel & du Plessis, 1874 accepted as Otomesostoma auditivum (Forel & Du Plessis, 1874) Hofsten, 1907 (Genus name with the wrong ending)
4. Species Mesostomum balatonicum Szigethy, 1897 accepted as Mesostoma balatonicum Szigethy, 1897 (Genus name with the wrong ending (See note on the genus))
5. Species Mesostomum banaticum Graff, 1875 accepted as Mesostoma banaticum Graff, 1875 accepted as Olisthanella truncula (Schmidt, 1858) Voigt, 1892
6. Species Mesostomum bifidum McIntosh, 1874 accepted as Pseudorhynchus bifidus (McIntosh, 1874) Graff, 1882 accepted as Astrotorhynchus bifidus (McIntosh, 1874) Graff, 1905
7. Species Mesostomum bistrigatum (Fabricius, 1826) Diesing, 1850 accepted as Mesostoma bistrigatum (Fabricius, 1826) Diesing, 1850
8. Species Mesostomum chlorosticum Schmidt, 1857 accepted as Proxenetes chlorosticus (Schmidt, 1857) Graff, 1882
9. Species Mesostomum craci Schmidt, 1858 accepted as Mesostoma craci Schmidt, 1858
10. Species Mesostomum cyathus Schmidt, 1858 accepted as Mesostoma chromobactrum Braun, 1885 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848
11. Species Mesostomum echinatum Uljanin, 1870 accepted as Proxenetes echinatus (Uljanin, 1870) Graff, 1882 (unaccepted > superseded combination)
12. Species Mesostomum ehrenbergii accepted as Mesostoma ehrenbergii (Focke, 1836) Örsted, 1843
13. Species Mesostomum ellipticum Uljanin, 1870 accepted as Promesostoma ellipticum (Uljanin, 1870) Graff, 1882 (unaccepted > superseded combination)
14. Species Mesostomum ensifer Uljanin, 1870 accepted as Promesostoma ensifer (Uljanin, 1870) Pereyaslawzewa, 1892 (unaccepted > superseded combination)
15. Species Mesostomum fallax Schmidt, 1858 accepted as Mesostoma productum (Schmidt, 1848) Leuckart, 1854 (unaccepted > junior subjective synonym)
16. Species Mesostomum flabelliferum Levinsen, 1879 accepted as Proxenetes flabellifer Jensen, 1878 (unaccepted > superseded combination)
17. Species Mesostomum graffii Mereschkowsky, 1879 accepted as Promesostoma graffii (Mereschkowsky, 1879) Graff, 1882 (unaccepted > superseded combination)
18. Species Mesostomum grossum accepted as Mesostoma grossum (Müller, 1774) Ehrenberg, 1836 accepted as Mesostoma productum (Schmidt, 1848) Leuckart, 1854 (unaccepted > misspelling - incorrect subsequent spelling, Wrong spelling of genus name)
19. Species Mesostomum hallezianum Vejdovsky, 1880 accepted as Mesostoma hallezianum Vejdovsky, 1880 accepted as Olisthanella halleziana (Vejdovsky, 1880) Sekera, 1906 accepted as Typhloplanella halleziana (Vejdovsky, 1880) Sekera, 1911 (Genus name with the wrong ending (See note on the genus))
20. Species Mesostomum herclotisanum accepted as Mesostomum herklotsianum De Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843 (unaccepted > misspelling - incorrect subsequent spelling)
21. Species Mesostomum herclotsianum accepted as Mesostomum herklotsianum De Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843 (unaccepted > misspelling - incorrect subsequent spelling)
22. Species Mesostomum herklotsianum De Man, 1875 accepted as Castrada (Castrada) radiata (Müller, 1773) Graff, 1882 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843
23. Species Mesostomum hirudo Schmidt, 1858 accepted as Typhloplana hirudo (Schmidt, 1858) Diesing, 1862 accepted as Mesostoma hirudo Schmidt, 1858 accepted as Castrada (Castrada) hirudo (Schmidt, 1858) Hofsten, 1907 (Genus name with the wrong ending (See note on the genus))
24. Species Mesostomum hystrix Schmarda, 1859 accepted as Mesostoma hystrix Schmarda, 1859 (Genus name with the wrong ending (See note on the genus))
25. Species Mesostomum lapponicum Schmidt, 1852 accepted as Mesostoma lapponicum Schmidt, 1852 accepted as Mesostoma viridatum (Abildgaard, 1789) Schultze, 1851 accepted as Typhloplana viridata (Abildgaard, 1789) Ehrenberg, 1831 (Genus name with the wrong ending (See note on the genus))
26. Species 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
27. Species Mesostomum lingua (Abildgaard, 1789) Schmidt, 1848 accepted as Mesostoma lingua (Abildgaard, 1789) Schmidt, 1848 (unaccepted > misspelling - incorrect subsequent spelling)
28. Species Mesostomum lugdunense De Man, 1875 accepted as Mesostoma lugdunense De Man, 1875 (Genus name with the wrong ending (See note on the genus))
29. Species Mesostomum marmoratum Schultze, 1851 accepted as Promesostoma marmoratum (Schultze, 1851) Graff, 1882 (unaccepted > superseded combination)
30. Species Mesostomum montanum Graff, 1875 accepted as Mesostoma rostratum (Müller, 1774) Ehrenberg, 1836 accepted as Rhynchomesostoma rostratum (Müller, 1774) Luther, 1904 (unaccepted > junior subjective synonym)
31. Species Mesostomum morgiense Du Plessis, 1876 accepted as 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 (Genus name with the wrong ending)
32. Species Mesostomum obtusum Schultze, 1851 accepted as Mesostoma obtusum Schultze, 1851 accepted as Olisthanella obtusa (Schultze, 1851) Luther, 1904 (Genus name with the wrong ending)
33. Species Mesostomum ovoideum Schmidt, 1852 accepted as Turbella ovoidea (Schmidt, 1852) Diesing, 1862 accepted as Promesostoma ovoideum (Schmidt, 1852) Graff, 1882
34. Species Mesostomum ovoideum Uljanin, 1870 accepted as Promesostoma solea (Schmidt, 1857) Graff, 1882
35. Species Mesostomum personatum Schmidt, 1848 accepted as Mesostoma personatum Schmidt, 1848 accepted as Bothromesostoma personatum (Schmidt, 1848) Braun, 1885
36. Species Mesostomum productum (Schmidt, 1848) Leuckart, 1854 accepted as Mesostoma productum (Schmidt, 1848) Leuckart, 1854 (unaccepted > misspelling - incorrect subsequent spelling, Genusname should be Mesostoma)
37. Species Mesostomum pusillum Schmidt, 1848 accepted as Turbella pusilla (Schmidt, 1848) Diesing, 1862 accepted as Mesostoma pusillum Schmidt, 1848 (unaccepted > superseded combination)
38. Species Mesostomum radiatum (Müller, 1773) Diesing, 1850 accepted as Turbella radiata (Müller, 1773) Diesing, 1862 accepted as Strongylostoma radiatum (Müller, 1773) Örsted, 1843 (unaccepted > superseded combination)
39. Species Mesostomum rostratum accepted as Mesostoma rostratum (Müller, 1774) Ehrenberg, 1836 accepted as Rhynchomesostoma rostratum (Müller, 1774) Luther, 1904
40. Species Mesostomum sensitivum Uljanin, 1870 accepted as Proxenetes sensitivus (Uljanin, 1870) Graff, 1882
41. Species Mesostomum solea Schmidt, 1857 accepted as Turbella solea (Schmidt, 1857) Diesing, 1862 accepted as Promesostoma solea (Schmidt, 1857) Graff, 1882 (unaccepted > superseded combination)
42. Species Mesostomum striatum Uljanin, 1870 accepted as Proxenetes striatus (Uljanin, 1870) Graff, 1882 (unaccepted > superseded combination)
43. Species Mesostomum sulphureum (Schmidt, 1848) De Man, 1875 accepted as Mesostoma sulphureum (Schmidt, 1848) De Man, 1875 (Genus name with the wrong ending)
44. Species Mesostomum tetragonum (Müller, 1774) Schmidt, 1848 accepted as Mesostoma tetragonum (Müller, 1774) Schmidt, 1848 (unaccepted > misspelling - incorrect subsequent spelling, Genus name schould be Mesostoma, not Mesostomum)
45. Species Mesostomum truncatum accepted as Mesostomum trunculum Schmidt, 1858 accepted as Mesostoma trunculum Schmidt, 1858 accepted as Olisthanella truncula (Schmidt, 1858) Voigt, 1892 (unaccepted > misspelling - incorrect subsequent spelling)
46. Species Mesostomum trunculum Schmidt, 1858 accepted as Mesostoma trunculum Schmidt, 1858 accepted as Olisthanella truncula (Schmidt, 1858) Voigt, 1892
47. Species Mesostomum variabile Weissmann, 1864 accepted as Mesostoma rostratum (Müller, 1774) Ehrenberg, 1836 accepted as Rhynchomesostoma rostratum (Müller, 1774) Luther, 1904 (unaccepted > junior subjective synonym)
48. Species Mesostomum variable accepted as Mesostomum variabile Weissmann, 1864 accepted as Mesostoma rostratum (Müller, 1774) Ehrenberg, 1836 accepted as Rhynchomesostoma rostratum (Müller, 1774) Luther, 1904 (unaccepted > misspelling - incorrect subsequent spelling)
49. Species Mesostomum violaceum Levinsen, 1879 accepted as Promesostoma ovoideum (Schmidt, 1852) Graff, 1882
50. Species Mesostomum virginianum Kepner, Stirewalt & Ferguson, 1938 accepted as Mesostoma virginianum Kepner, Stirewalt & Ferguson, 1938 (unaccepted > misspelling - incorrect subsequent spelling)
51. Species Mesostomum viridatum (Abildgaard, 1789) Schultze, 1851 accepted as Mesostoma viridatum (Abildgaard, 1789) Schultze, 1851 accepted as Typhloplana viridata (Abildgaard, 1789) Ehrenberg, 1831 (Genus name with the wrong ending (See note on the genus))
52. Species Mesostomum wandae Schmidt, 1858 accepted as Mesostoma rostratum (Müller, 1774) Ehrenberg, 1836 accepted as Rhynchomesostoma rostratum (Müller, 1774) Luther, 1904 (unaccepted > junior subjective synonym)
53. Species Mesostomum bacilliferum (Diesing, 1862) De Man, 1875 (uncertain > nomen dubium)
54. Species Mesostomum pratense Schultze, 1851 (uncertain > nomen dubium)

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