1. Species Nemastoma canariense (Kützing) Montagne, 1856
2. Species Nemastoma coliforme J.Agardh, 1885
3. Species Nemastoma dichotomum J.Agardh, 1842
4. Species Nemastoma discigenum (C.Agardh) J.Agardh, 1851
5. Species Nemastoma dumontioides J.Agardh, 1851
6. Species Nemastoma fernandezianum Levring ex J.De Toni, 1947
7. Species Nemastoma foliaceum Yamada, 1941
8. Species Nemastoma jardinii
9. Species Nemastoma lenormandianum J.Agardh
10. Species Nemastoma minus Zanardini, 1869
11. Species Nemastoma multifidum (J.Agardh) J.Agardh, 1851
12. Species Nemastoma palmatum Harvey
13. Species Nemastoma proliferum Harvey, 1855
14. Species Nemastoma attenuatum Harvey, 1855 accepted as Glaphyrosiphon intestinalis (Harvey) Leister & W.A.Nelson, 2010 (synonym)
15. Species Nemastoma bairdii Farlow, 1875 accepted as Tsengia bairdii (Farlow) K.C.Fan & Y.P.Fan, 1962
16. Species Nemastoma californicum Farlow, 1877 accepted as Gloiosiphonia californica (Farlow) J.Agardh, 1885
17. Species Nemastoma canariensis (Kützing) J. Agardh accepted as Nemastoma canariense (Kützing) Montagne, 1856
18. Species Nemastoma cervicornis J.Agardh, 1842 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894 (synonym)
19. Species Nemastoma comosum Harvey, 1859 accepted as Tsengia comosa (Harvey) Womersley & Kraft, 1994
20. Species Nemastoma confusum Kraft & D.M.John, 1976 accepted as Platoma confusum (Kraft & D.M.John) Gabriel & Fredericq, 2011 (synonym)
21. Species Nemastoma constrictum Ercegovic, 1949 accepted as Nemastoma dichotomum var. longitrichogynum (Ercegović) Athanasiadis, 2016 (synonym)
22. Species Nemastoma cowdryi M.Howe, 1924 accepted as Tsengia nakamurae (Yendo) K.C.Fan & Y.P.Fan, 1962
23. Species Nemastoma cyclocolpum (Montagne) Zanardini, 1843 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894
24. Species Nemastoma damaecorne Harvey, 1855 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894
25. Species Nemastoma damicorne Harvey, 1855 accepted as Platoma cyclocolpum (Montagne) F.Schmitz, 1894
26. Species Nemastoma daviesii Harvey, 1855 accepted as Grateloupia urvilleana (Montagne) P.G.Parkinson, 1974
27. Species Nemastoma densum Harvey, 1859 accepted as Helminthocladia densa (Harvey) F.Schmitz & Hauptfleisch, 1896
28. Species Nemastoma endiviaefolium Harvey, 1855 accepted as Grateloupia urvilleana (Montagne) P.G.Parkinson, 1974
29. Species Nemastoma feredayae Harvey, 1859 accepted as Tsengia feredayae (Harvey) Womersley & Kraft, 1994 (synonym)
30. Species Nemastoma foliaceum Levring, 1941 accepted as Nemastoma fernandezianum Levring ex J.De Toni, 1947 (synonym)
31. Species Nemastoma gelatinosum M.Howe, 1918 accepted as Platoma gelatinosum (M.Howe) C.W.Schneider, McDevit, G.W.Saunders & C.E.Lane, 2011 (synonym)
32. Species Nemastoma gelinarioides Harvey, 1855 accepted as Gelinaria ulvoidea Sonder, 1845
33. Species Nemastoma intestinale Harvey, 1855 accepted as Glaphyrosiphon intestinalis (Harvey) Leister & W.A.Nelson, 2010 (synonym)
34. Species Nemastoma laciniatum J.Agardh, 1876 accepted as Tsengia laciniata (J.Agardh) D'Archino & Zuccarello, 2020
35. Species Nemastoma laingii Kylin, 1932 accepted as Tsengia laingii (Kylin) Womersley & Kraft, 1994
36. Species Nemastoma lanceolatum J.Agardh, 1848 accepted as Tsengia lanceolata (J.Agardh) Saunders & Kraft, 2002 (synonym)
37. Species Nemastoma lancifolium Okamura, 1933 accepted as Tsengia lancifolia (Okamura) Masuda & Guiry, 1994
38. Species Nemastoma levringii T.Yoshida, 1992 accepted as Nemastoma fernandezianum Levring ex J.De Toni, 1947 (synonym)
39. Species Nemastoma lividum Harvey, 1857 accepted as Grateloupia livida (Harvey) Yamada, 1931
40. Species Nemastoma marginatum (Roussel) J.Agardh, 1842 accepted as Felicinia marginata (Roussel) Manghisi, Le Gall, Ribera, Gargiulo & Morabito, 2014
41. Species Nemastoma marginiferum J.Agardh, 1851 accepted as Itonoa marginifera (J.Agardh) Masuda & Guiry, 1995
42. Species Nemastoma minus J.Agardh, 1842 accepted as Schizymenia dubyi (Chauvin ex Duby) J.Agardh, 1851 (synonym)
43. Species Nemastoma nakamurae Yendo, 1920 accepted as Tsengia nakamurae (Yendo) K.C.Fan & Y.P.Fan, 1962
44. Species Nemastoma oligarthum (J.Agardh) Kylin, 1934 accepted as Catenellopsis oligarthra (J.Agardh) V.J.Chapman, 1979
45. Species Nemastoma pinnatum J.D.Hooker & Harvey, 1855 accepted as Grateloupia urvilleana (Montagne) P.G.Parkinson, 1974
46. Species Nemastoma pulchrum Baardseth, 1941 accepted as Tsengia pulchra (Baardseth) Masuda & Guiry, 1994 (synonym)
47. Species Nemastoma vermiculare J.Agardh, 1851 accepted as Calosiphonia vermicularis (J.Agardh) F.Schmitz, 1889
48. Species Nemastoma caulescens J.Agardh (uncertain)
49. Species Nemastoma cuneatum J.Agardh (uncertain)
50. Species Nemastoma endiviifolium Harvey (uncertain)
51. Species Nemastoma furcatum Meneghini (uncertain)
52. Species Nemastoma inconspicuumR einsch (uncertain)

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