1. Subgenus Waihaoia (Pachymelon) Marwick, 1926 † accepted as Pachymelon Marwick, 1926 †
   1. Species Waihaoia (Pachymelon) amoriaformis Marwick, 1926 † accepted as Pachymelon amoriaformis (Marwick, 1926) † (superseded combination)
   2. Species Waihaoia (Pachymelon) bulbus Marwick, 1931 † accepted as Alcithoe bulbus (Marwick, 1931) † (superseded combination)
   3. Species Waihaoia (Pachymelon) firma Marwick, 1926 † accepted as Alcithoe firma (Marwick, 1926) † (superseded combination)
   4. Species Waihaoia (Pachymelon) murdochi Marwick, 1926 † accepted as Alcithoe murdochi (Marwick, 1926) † (superseded combination)
   5. Species Waihaoia (Pachymelon) pinguella Marwick, 1931 † accepted as Alcithoe pinguella (Marwick, 1931) † (superseded combination)
   6. Species Waihaoia (Pachymelon) renwicki Marwick, 1928 † accepted as Alcithoe renwicki (Marwick, 1928) † (superseded combination)
   7. Species Waihaoia (Pachymelon) waitakiensis Marwick, 1926 † accepted as Teremelon waitakiensis (Marwick, 1926) † (superseded combination)
2. Subgenus Waihaoia (Palomelon) H. J. Finlay, 1926 accepted as Alcithoe H. Adams & A. Adams, 1853 (junior subjective synonym)
   1. Species Waihaoia (Palomelon) lutea (R. B. Watson, 1882) accepted as Alcithoe lutea (R. B. Watson, 1882) (superseded combination)
3. Subgenus Waihaoia (Teremelon) Marwick, 1926 accepted as Teremelon Marwick, 1926 † (superseded combination)
   1. Species Waihaoia (Teremelon) awamoaensis Marwick, 1926 † accepted as Teremelon tumidior (H. J. Finlay, 1926) † (junior subjective synonym)
4. Species Waihaoia allani Marwick, 1926 † accepted as Spinomelon allani (Marwick, 1926) † (superseded combination)
5. Species Waihaoia amoriaformis Marwick, 1926 † accepted as Pachymelon amoriaformis (Marwick, 1926) † (superseded combination)
6. Species Waihaoia awamoaensis Marwick, 1926 † accepted as Teremelon tumidior (H. J. Finlay, 1926) † (junior subjective synonym)
7. Species Waihaoia bulbus Marwick, 1931 † accepted as Alcithoe bulbus (Marwick, 1931) † (superseded combination)
8. Species Waihaoia confusa Marwick, 1926 † accepted as Spinomelon confusa (Marwick, 1926) † (superseded combination)
9. Species Waihaoia firma Marwick, 1926 † accepted as Alcithoe firma (Marwick, 1926) † (superseded combination)
10. Species Waihaoia formosa Laws, 1935 † accepted as Spinomelon formosa (Laws, 1935) † (original combination)
11. Species Waihaoia lutea (R. B. Watson, 1882) accepted as Alcithoe lutea (R. B. Watson, 1882) (superseded combination)
12. Species Waihaoia murdochi Marwick, 1926 † accepted as Alcithoe murdochi (Marwick, 1926) † (superseded combination)
13. Species Waihaoia nodulifera Laws, 1935 † accepted as Alcithoe nodulifera (Laws, 1935) † (superseded combination)
14. Species Waihaoia pinguella Marwick, 1931 † accepted as Alcithoe pinguella (Marwick, 1931) † (superseded combination)
15. Species Waihaoia renwicki Marwick, 1928 † accepted as Alcithoe renwicki (Marwick, 1928) † (superseded combination)
16. Species Waihaoia rugosa Marwick, 1926 † accepted as Alcithoe rugosa (Marwick, 1926) † (superseded combination)
17. Species Waihaoia scitula Marwick, 1926 † accepted as Alcithoe scitula (Marwick, 1926) † (superseded combination)
18. Species Waihaoia striata Laws, 1935 † accepted as Teremelon striata (Laws, 1935) † (original combination)
19. Species Waihaoia superstes Marwick, 1926 † accepted as Spinomelon superstes (Marwick, 1926) † (superseded combination)
20. Species Waihaoia suteri Marwick, 1926 † accepted as Spinomelon suteri (Marwick, 1926) † (superseded combination)
21. Species Waihaoia thomsoni Marwick, 1926 † accepted as Spinomelon thomsoni (Marwick, 1926) † (superseded combination)
22. Species Waihaoia waitakiensis Marwick, 1926 † accepted as Teremelon waitakiensis (Marwick, 1926) † (superseded combination)

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