1. Species Udotea abbottiorum D.S.Littler & Littler, 1990
2. Species Udotea argentea Zanardini, 1858
3. Species Udotea caribaea D.S.Littler & Littler, 1990
4. Species Udotea conglutinata (J.Ellis & Solander) J.V.Lamouroux, 1816
5. Species Udotea cyathiformis Decaisne, 1842
6. Species Udotea dixonii D.S.Littler & Littler, 1990
7. Species Udotea dotyi D.S.Littler & Littler, 1990
8. Species Udotea explanata Gepp & E.S.Gepp, 1911
9. Species Udotea fibrosa D.S.Littler & Littler, 1990
10. Species Udotea flabelliformis (Desfontaines) P.L.Crouan & H.M.Crouan
11. Species Udotea flabellum (J.Ellis & Solander) M.Howe, 1904
12. Species Udotea fontanesii Decaisne
13. Species Udotea fragilifolia C.K.Tseng & M.L.Dong, 1975
14. Species Udotea geppiorum Yamada, 1930
15. Species Udotea glaucescens Harvey ex J.Agardh, 1887
16. Species Udotea goreaui D.S.Littler & Littler, 1990
17. Species Udotea indica A.Gepp & E.S.Gepp, 1911
18. Species Udotea kuetzingii De Toni, 1889
19. Species Udotea lacinulata (Kützing) Kützing, 1849
20. Species Udotea looensis D.S.Littler & M.M.Littler, 1990
21. Species Udotea luna D.S.Littler & M.M.Littler, 1990
22. Species Udotea luteofusca Howe
23. Species Udotea norrisii D.S.Littler & M.M.Littler, 1990
24. Species Udotea occidentalis A.Gepp & E.S.Gepp, 1911
25. Species Udotea orientalis A.Gepp & E.S.Gepp, 1911
26. Species Udotea palmetta Decaisne, 1842
27. Species Udotea papillosa A.Gepp & E.Gepp, 1911
28. Species Udotea plumula
29. Species Udotea polychotomis Cordero, 1975
30. Species Udotea reniformis C.K.Tseng & Dong, 1975
31. Species Udotea spinulosa M.Howe, 1909
32. Species Udotea suborbiculata Sonder
33. Species Udotea tenax C.K.Tseng & M.L.Dong, 1975
34. Species Udotea tenuifolia C.K.Tseng & M.L.Dong, 1975
35. Species Udotea tomentosa (Kützing) G.Murray
36. Species Udotea unistratea D.S.Littler & Littler, 1990
37. Species Udotea velutina C.K.Tseng & M.L.Dong, 1975
38. Species Udotea verticillosa A.Gepp & E.S.Gepp, 1909
39. Species Udotea wilsonii A.Gepp, E.S.Gepp & M.A.Howe, 1911
40. Species Udotea xishaensis C.K.Tseng & Dong, 1975
41. Species Udotea yamadae Tanaka & Itono, 1977
42. Species Udotea abbreviata Gilbert, 1962 accepted as Siphonogramen abbreviatum (W.J.Gilbert) I.A.Abbott & Huisman, 2004 (synonym)
43. Species Udotea amadelpha Montagne, 1857 accepted as Avrainvillea amadelpha (Montagne) A.Gepp & E.S.Gepp, 1908 (synonym)
44. Species Udotea desfontainii (J.V.Lamouroux) Decaisne, 1842 accepted as Flabellia petiolata (Turra) Nizamuddin, 1987 (synonym)
45. Species Udotea flabellata J.V.Lamououx, 1816 accepted as Udotea flabellum (J.Ellis & Solander) M.Howe, 1904
46. Species Udotea halimeda Kützing, 1849 accepted as Udotea flabellum (J.Ellis & Solander) M.Howe, 1904
47. Species Udotea infundibulum J.Agardh, 1887 accepted as Udotea cyathiformis f. infundibulum (J.Agardh) D.S.Littler & Littler, 1990 (synonym)
48. Species Udotea javensis (Montagne) A.Gepp & E.S.Gepp, 1904 accepted as Rhipidosiphon javensis Montagne, 1842 (synonym)
49. Species Udotea luteofusca (P.L.Crouan & H.M.Crouan) M.A.Howe, 1907 accepted as Cladocephalus luteofuscus (P.Crouan & H.Crouan) Børgesen, 1909 (synonym)
50. Species Udotea minima Ernst, 1904 accepted as Flabellia petiolata (Turra) Nizamuddin, 1987
51. Species Udotea peltata J.Agardh, 1887 accepted as Rhipiliopsis peltata (J.Agardh) A.Gepp & E.Gepp, 1911 (synonym)
52. Species Udotea petiolata (Turra) Børgesen, 1925 accepted as Flabellia petiolata (Turra) Nizamuddin, 1987 (synonym)
53. Species Udotea phoenix (Ellis & Solander) Crouan & Crouan, 1878 accepted as Rhipocephalus phoenix (J.Ellis & Solander) Kützing, 1843 (synonym)
54. Species Udotea plametta accepted as Udotea palmetta Decaisne, 1842 (misspelling)
55. Species Udotea reticulata C.Hoek, 1978 accepted as Rhipiliopsis reticulata (C.Hoek) Farghaly & Denizot, 1979 (synonym)
56. Species Udotea sordida Montagne, 1844 accepted as Avrainvillea erecta (Berkeley) A.Gepp & E.S.Gepp, 1911 (synonym)
57. Species Udotea sublittoralis W.R.Taylor, 1928 accepted as Udotea cyathiformis f. sublittoralis (W.R.Taylor) D.S.Littler & Littler, 1990 (synonym)
58. Species Udotea ciliata Kützing (uncertain)
59. Species Udotea iyengarii Untawale, Dhargalkar & Agadi, 1983 (uncertain)
60. Species Udotea lacerata Harvey (uncertain)

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