1. Species Dumontia alaskana V.Tai, S.C.Lindstrom & G.W.Saunders, 2001
2. Species Dumontia canariensis Montagne, 1841
3. Species Dumontia clava Postels & Ruprecht, 1840
4. Species Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
5. Species Dumontia cornuta J.D.Hooker & Harvey, 1845
6. Species Dumontia simplex Cotton, 1906
7. Species Dumontia calvadosii J.V.Lamouroux ex Duby, 1830 accepted as Helminthocladia calvadosii (J.V.Lamouroux ex Duby) Setchell, 1915
8. Species Dumontia decapitata Postels & Ruprecht, 1841 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850 (synonym)
9. Species Dumontia dura Ruprecht, 1850 accepted as Gloiopeltis dura (Ruprecht) J.Agardh, 1876 (synonym)
10. Species Dumontia fastigiata (Bory de Saint-Vincent) Bory de Saint-Vincent, 1828 accepted as Nothogenia fastigiata (Bory) P.G.Parkinson, 1983
11. Species Dumontia filiformis (Hornemann) Greville, 1830 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
12. Species Dumontia firma Postels & Ruprecht, 1840 accepted as Devaleraea firma (Postels & Ruprecht) Selivanova, 2016
13. Species Dumontia fucicola Postels & Ruprecht, 1840 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850 (synonym)
14. Species Dumontia furcata Postels & Ruprecht, 1840 accepted as Gloiopeltis furcata (Postels & Ruprecht) J.Agardh, 1851
15. Species Dumontia furcellata (Turner) Bory, 1834 accepted as Scinaia furcellata (Turner) J.Agardh, 1851
16. Species Dumontia hydrophora Postels & Ruprecht, 1840 accepted as Halosaccion glandiforme (S.G.Gmelin) Ruprecht, 1850
17. Species Dumontia incrassata (O.F.Müller) J.V.Lamouroux, 1813 accepted as Dumontia contorta (S.G.Gmelin) Ruprecht, 1850
18. Species Dumontia interrupta (A.P.de Candolle) Duby, 1830 accepted as Scinaia interrupta (A.P.de Candolle) M.J.Wynne, 1989
19. Species Dumontia lepechinii Postels & Ruprecht, 1840 accepted as Halosaccion saccatum (Lepechin) Kützing, 1866
20. Species Dumontia lepechinii Endlicher, 1843 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
21. Species Dumontia ovalis Suhr, 1840 accepted as Nothogenia ovalis (Suhr) P.G.Parkinson, 1983
22. Species Dumontia prismatica J.Agardh, 1841 accepted as Corynomorpha prismatica (J.Agardh) J.Agardh, 1876
23. Species Dumontia ramentacea (Linaeus) Greville, 1830 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
24. Species Dumontia robusta Greville, 1830 accepted as Solieria robusta (Greville) Kylin, 1932
25. Species Dumontia sobolifera (Oeder) J.V.Lamouroux, 1813 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982 (synonym)
26. Species Dumontia triquetra J.V.Lamouroux, 1813 accepted as Scinaia interrupta (A.P.de Candolle) M.J.Wynne, 1989
27. Species Dumontia tubulosa (Lepechin) Postels & Ruprecht, 1840 accepted as Devaleraea ramentacea (Linnaeus) Guiry, 1982
28. Species Dumontia ventricosa J.V.Lamouroux, 1813 accepted as Chrysymenia ventricosa (J.V.Lamouroux) J.Agardh, 1842
29. Species Dumontia humilis Schousboe (uncertain)
30. Species Dumontia pinnatifida Schousboe (uncertain)

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