1. Species Monostomum cymbium Diesing, 1850 accepted as Neivaia cymbium (Diesing, 1850) Dubois, 1959 (unaccepted > superseded combination)
2. Species Monostomum dujonis Leuckart, 1874 accepted as Opisthotrema dujonis (Leuckart, 1874) Price, 1932 (Superseded combination)
3. Species Monostomum echinatum von Linstow, 1878 accepted as Cryptocotyle echinatum (von Linstow, 1878) Lühe, 1909 accepted as Cryptocotyle concava (Creplin, 1825) Lühe, 1899 (unaccepted > superseded combination)
4. Species Monostomum exile (Stossich, 1903) Lühe, 1909 accepted as Selfcoelum exile (Stossich, 1903) Dronen & Blend, 2015 (unaccepted > superseded combination)
5. Species Monostomum galeatum (Rudolphi, 1819) accepted as Monostoma galeatum Rudolphi, 1819 accepted as Rhipidocotyle galeata (Rudolphi, 1819) Eckmann, 1932 (Superseded combination)
6. Species Monostomum lacteum Jägerskiöld, 1896 accepted as Galactosomum lacteum (Jägerskiöld, 1896) Looss, 1899 (Superseded combination)
7. Species Monostomum molle Leidy, 1856 accepted as Pleorchis mollis (Leidy, 1856) Stiles, 1896 accepted as Pleorchis americanus Lühe, 1906 (unaccepted > superseded combination)
8. Species Monostomum nephrocephalum Diesing, 1858 accepted as Pyelosomum renicapite (Leidy, 1856) Ruiz, 1946 (synonym)
9. Species Monostomum ovopunctatum (Stossich, 1903) Lühe, 1909 accepted as Selfcoelum ovopunctatum (Stossich, 1903) Dronen & Blend, 2015 (unaccepted > superseded combination)
10. Species Monostomum pomacanthi MacCallum, 1916 accepted as Barisomum erubescens Linton, 1910 accepted as Pyelosomum erubescens (Linton, 1910) (synonym)
11. Species Monostomum reticulare Van Beneden, 1859 accepted as Microscaphidium reticulare (Van Beneden, 1859) Looss, 1901 (Superseded combination)
12. Species Monostomum spinossimum Stossich, 1883 accepted as Centroderma spinosissima (Stossich, 1883) Lühe, 1901 (Superseded combination)
13. Species Monostomum stossichianum Monticelli, 1892 accepted as Centroderma stossichianum (Monticelli, 1892) Skrjabin, 1963 accepted as Elstia stossichianum (Monticelli, 1892) Bray, 1984 (Superseded combination)
14. Species Monostomum vicarium Arnsdorff, 1908 accepted as Selfcoelum vicarium (Arnsdorff, 1908) Dronen & Blend, 2015 (unaccepted > superseded combination)
15. Species Monostomum vinaledwardsii Linton, 1901 accepted as Siphodera vinaledwardsii (Linton, 1901) Linton, 1910 (Superseded combination)

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