1. Species Giffordia turbinariae Jaasund, 1969
2. Species Giffordia acutoramulis (Noda) Luan & Luan, 1991 accepted as Hincksia acutoramulis (Noda) R.X.Luan, 2009
3. Species Giffordia andamanensis V.Krishnamurthy & Baluswami, 1983 accepted as Hincksia andamanensis (V.Krishnamurthy & Baluswami) P.C.Silva, 1987
4. Species Giffordia bhimlipatnamensis V.Krishnamurthy & Baluswami, 1983 accepted as Hincksia bhimlipatnamensis (V.Krishnamurthy & Baluswami) P.C.Silva, 1987
5. Species Giffordia breviarticulata (J.Agardh) Doty & I.A.Abbott accepted as Asteronema breviarticulatum (J.Agardh) Ouriques & Bouzon, 2000 (synonym)
6. Species Giffordia clavata V.Krishnamurthy & Baluswami, 1983 accepted as Hincksia clavata (V.Krishnamurthy & Baluswami) P.C.Silva, 1987
7. Species Giffordia conifera (Børgesen) W.R.Taylor, 1960 accepted as Hincksia conifera (Børgesen) I.A.Abbott, 1989 (synonym)
8. Species Giffordia dalmatica (Ercegovic) Cormaci & G.Furnari, 1987 accepted as Hincksia dalmatica (Ercegovic) Cormaci & G.Furnari, 1992
9. Species Giffordia duchassaingiana (Grunow) W.R.Taylor, 1960 accepted as Feldmannia duchassaingiana (Grunow) Aisha & Shameel, 2011
10. Species Giffordia elegans (Thuret) Knoeppfler-Peguy, 1974 accepted as Hincksia sandriana (Zanardini) P.C.Silva, 1987
11. Species Giffordia fenestrata (Berkeley ex Harvey) Batters, 1893 accepted as Hincksia fenestrata (Berkeley ex Harvey) P.C.Silva, 1987
12. Species Giffordia fuscata (Zanardini) Kuckuck accepted as Hincksia fuscata (Zanardini) P.C.Silva, 1987
13. Species Giffordia geniculata (Ercegovic) Cormaci & G.Furnari, 1987 accepted as Hincksia geniculata (Ercegovic) Cormaci & G.Furnari, 1992
14. Species Giffordia ghardaqaensis (Nasr) Papenfuss, 1968 accepted as Hincksia ghardaqaensis (Nasr) P.C.Silva, 1987 (synonym)
15. Species Giffordia granulosa (Smith) Hamel, 1939 accepted as Hincksia granulosa (Smith) P.C.Silva, 1987 (synonym)
16. Species Giffordia granulosoides (Setchell & N.L.Gardner) Hollenberg & I.A.Abbott, 1966 accepted as Hincksia sandriana (Zanardini) P.C.Silva, 1987 (synonym)
17. Species Giffordia hauckii (Ercegovic) Cormaci & G.Furnari, 1987 accepted as Hincksia hauckii (Ercegovic) Cormaci & G.Furnari, 1992
18. Species Giffordia hincksiae (Harvey) Hamel, 1939 accepted as Hincksia hincksiae (Harvey) P.C.Silva, 1987 (synonym)
19. Species Giffordia indica (Sonder) Papenfuss & Chihara, 1968 accepted as Feldmannia indica (Sonder) Womersley & A.Bailey, 1970 (synonym)
20. Species Giffordia intermedia (Rosenvinge) S.Lund, 1959 accepted as Hincksia ovata (Kjellman) P.C.Silva, 1987
21. Species Giffordia irregularis (Kützing) Joly, 1965 accepted as Feldmannia irregularis (Kützing) Hamel, 1939
22. Species Giffordia lebelii (Areschoug ex P.Crouan & H.Crouan) Batters, 1893 accepted as Feldmannia lebelii (Areschoug ex P.Crouan & H.Crouan) Hamel, 1939 (synonym)
23. Species Giffordia mitchellae (Harv.) Hamel accepted as Giffordia mitchelliae (Harvey) G.Hamel, 1939 accepted as Feldmannia mitchelliae (Harvey) H.-S.Kim, 2010 (misspelling)
24. Species Giffordia mitchelliae (Harvey) G.Hamel, 1939 accepted as Feldmannia mitchelliae (Harvey) H.-S.Kim, 2010 (synonym)
25. Species Giffordia onslowensis Amsler & Kapraun, 1985 accepted as Hincksia onslowensis (Amsler & Kapraun) P.C.Silva, 1987
26. Species Giffordia ovata (Kjellman) Kylin, 1947 accepted as Hincksia ovata (Kjellman) P.C.Silva, 1987 (synonym)
27. Species Giffordia oviger (Harvey) Hollenberg & I.A.Abbott, 1966 accepted as Hincksia granulosa (Smith) P.C.Silva, 1987
28. Species Giffordia padinae Buffham, 1893 accepted as Feldmannia padinae (Buffham) Hamel, 1939
29. Species Giffordia prolifera V.Krishnamurthy & Baluswami, 1983 accepted as Hincksia prolifera (V.Krishnamurthy & Baluswami) P.C.Silva, 1987
30. Species Giffordia rallsiae (Vickers) W.R.Taylor, 1960 accepted as Ectocarpus rallsiae Vickers, 1905 (synonym)
31. Species Giffordia recurvata Kuckuck ex Cardinal, 1964 accepted as Hincksia granulosa (Smith) P.C.Silva, 1987
32. Species Giffordia sandriana (Zanardini) Hamel, 1939 accepted as Hincksia sandriana (Zanardini) P.C.Silva, 1987 (synonym)
33. Species Giffordia saundersii (Setchell & N.L.Gardner) Hollenberg & I.A.Abbott, 1966 accepted as Hincksia saundersii (Setchell & N.L.Gardner) P.C.Silva, 1987
34. Species Giffordia secunda (Kützing) Batters, 1893 accepted as Hincksia secunda (Kützing) P.C.Silva, 1987 (synonym)
35. Species Giffordia sordida (Harvey) M.N.Clayton, 1974 accepted as Hincksia sordida (Harvey) P.C.Silva, 1987
36. Species Giffordia terminalis V.Krishnamurthy & Baluswami, 1983 accepted as Hincksia terminalis (V.Krishnamurthy & Baluswami) P.C.Silva, 1987
37. Species Giffordia thyrsoidea (Børgesen) A.K.M.N.Islam, 1976 accepted as Hincksia thyrsoidea (Børgesen) P.C.Silva, 1987
38. Species Giffordia zhejiangensis S.B.Wang, 1994 accepted as Hincksia zhejiangensis (S.B.Wang) Luan Rixiao & Ding Lanping, 2015
39. Species Giffordia hainanensis S.B.Wang, 1994 (uncertain)

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