1. Species Monostoma album Kuhl & van Hasselt, 1822 accepted as Cricocephalus albus (Kuhl & van Hasselt, 1822) Looss, 1899 (Superseded combination)
2. Species Monostoma alvieforme Cohn, 1904 accepted as Paramonostomum alveatum (Mehlis in Creplin, 1846) Lühe, 1909
3. Species Monostoma bipartitum Wedl, 1855 accepted as Wedlia bipartita (Wedl, 1855) Cobbold, 1860 (Superseded combination)
4. Species Monostoma capitellata Rudolphi, 1819 accepted as Wardula capitellata (Rudolphi, 1819) Poche, 1926 (superseded combination)
5. Species Monostoma crucibulum Rudolphi, 1819 accepted as Prosorhynchus crucibulum (Rudolphi, 1819) Odhner, 1905 (Superseded combination)
6. Species Monostoma dujonis Leuckart, 1874 accepted as Opisthotrema dujonis (Leuckart, 1874) Price, 1932 (Superseded combination)
7. Species Monostoma filicolle Rudolphi, 1819 accepted as Koellikeria filicollis (Rudolphi, 1819) Cobbold, 1860 (unaccepted > superseded combination)
8. Species Monostoma flavum Mehlis, 1831 accepted as Typhlocoelum flavum (Mehlis, 1831) Stossich, 1903 accepted as Typhlocoelum cucumerinum (Rudolphi, 1809) Stossich, 1903 (unaccepted > superseded combination)
9. Species Monostoma galeatum Rudolphi, 1819 accepted as Rhipidocotyle galeata (Rudolphi, 1819) Eckmann, 1932 (Superseded combination)
10. Species Monostoma himantopodis Rudolphi, 1819 accepted as Cyclocoelum mutabile (Zeder, 1800) Brandes, 1892 (unaccepted > junior subjective synonym)
11. Species Monostoma holostomoides Mehlis in Creplin, 1846 accepted as Taphrogonymus holostomoides (Mehlis in Creplin, 1846) Cohn, 1904 (unaccepted > superseded combination)
12. Species Monostoma lanceolatum Wedl, 1858 accepted as Haematotrephus lanceolatum (Wedl, 1858) Stossich, 1903 (unaccepted > superseded combination)
13. Species Monostoma microstomum Creplin, 1829 accepted as Cyclocoelum microstomum (Creplin, 1829) Kossack, 1911 accepted as Cyclocoelum mutabile (Zeder, 1800) Brandes, 1892 (unaccepted > superseded combination)
14. Species Monostoma molae Rudolphi, 1819 accepted as Didymozoon molae (Rudolphi, 1819) Dollfus, 1946 (Superseded combination)
15. Species Monostoma oculobium Cohn, 1902 accepted as Spaniometra oculobia (Cohn, 1902) Kossack, 1911 (unaccepted > superseded combination)
16. Species Monostoma orbiculare Rudolphi, 1819 accepted as Mesometra orbicularis (Rudolphi, 1819) Lühe, 1901
17. Species Monostoma plicatum Creplin, 1829 accepted as Ogmogaster plicata (Creplin, 1829) Jägerskiöld, 1891 (Superseded combination)
18. Species Monostoma renicapite Leidy, 1856 accepted as Pronocephalus renicapite (Leidy, 1856) Pratt, 1916 accepted as Astrorchis renicapite (Leidy, 1856) Poche, 1926 accepted as Pyelosomum renicapite (Leidy, 1856) Ruiz, 1946 (Superseded combination)
19. Species Monostoma semifuscum Olsson, 1876 accepted as Galactosomum semifuscum (Olsson, 1876) Price, 1934 (Superseded combination)
20. Species Monostoma tenuicolle Rudolphi, 1819 accepted as Didymozoon tenuicolle (Rudolphi, 1819) Kossack, 1911 accepted as Koellikeria tenuicolle (Rudolphi, 1819) MacCallum & MacCallum, 1916 accepted as Neolamprididymozoon tenuicolle (Rudolphi, 1819) Wierzbicka, 1982 (superseded combination)
21. Species Monostoma trigonocephalum Rudolphi, 1809 accepted as Pleurogonius trigonocephalus (Rudolphi, 1809) Looss, 1901 (Superseded combination)
22. Species Monostoma viviparae von Linstow, 1877 accepted as Linstowiella viviparae (von Linstow, 1877) Szidat, 1933 (Superseded combination)
23. Species Monostoma filum Dujardin, 1845 (uncertain > taxon inquirendum)

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