1. Species Hermadion magalhaensi Kinberg, 1856
2. Species Hermadion acanellae [auct.] accepted as Neopolynoe acanellae (Verrill, 1882) (superseded recombination)
3. Species Hermadion africanus Hartman, 1976 accepted as Harmothoe africanus (Hartman, 1976) (superseded recombination)
4. Species Hermadion ambiguum Ehlers, 1900 accepted as Harmothoe magellanica (McIntosh, 1885) (subjective synonym)
5. Species Hermadion anderssoni (Bergström, 1916) accepted as Harmothoe anderssoni Bergström, 1916 (superseded subsequent combination, revalidation to original name)
6. Species Hermadion assimile McIntosh, 1874 accepted as Adyte assimilis (McIntosh, 1874) accepted as Adyte hyalina (G.O. Sars, 1873) (superseded original combination)
7. Species Hermadion echini Giard, 1886 accepted as Adyte assimilis (McIntosh, 1874) accepted as Adyte hyalina (G.O. Sars, 1873) (subjective synonym)
8. Species Hermadion extenuata (Grube, 1840) accepted as Harmothoe extenuata (Grube, 1840) (superseded recombination)
9. Species Hermadion ferox Baird, 1865 accepted as Antarctinoe ferox (Baird, 1865) (subjective synonym)
10. Species Hermadion fragile Claparède, 1868 accepted as Subadyte pellucida (Ehlers, 1864) (subjective synonym)
11. Species Hermadion fugax Giard, 1890 accepted as Subadyte pellucida (Ehlers, 1864) (subjective synonym)
12. Species Hermadion fuligineum Baird, 1865 accepted as Harmothoe spinosa Kinberg, 1856 (subjective synonym)
13. Species Hermadion hyalinus G.O. Sars, 1873 accepted as Adyte hyalina (G.O. Sars, 1873) (superseded recombination)
14. Species Hermadion kerguelensis McIntosh, 1885 accepted as Hermadion magalhaensi Kinberg, 1856 (subjective synonym)
15. Species Hermadion longicirratus Kinberg, 1856 accepted as Hermadion magalhaensi Kinberg, 1856 (subjective synonym)
16. Species Hermadion molluscum Ehlers, 1897 accepted as Hermadion magalhaensi Kinberg, 1856
17. Species Hermadion nipponicus Imajima & Hartman, 1964 accepted as Hermadionella nipponicus (Imajima & Hartman, 1964) (superseded original combination)
18. Species Hermadion ornatus Hartman, 1967 accepted as Harmothoe ornatus (Hartman, 1967) (superseded recombination)
19. Species Hermadion pellucidum (Ehlers, 1864) accepted as Subadyte pellucida (Ehlers, 1864) (superseded recombination)
20. Species Hermadion rouchi Gravier, 1911 accepted as Hermadion ferox Baird, 1865 accepted as Antarctinoe ferox (Baird, 1865) (subjective synonym)
21. Species Hermadion sabatieri Darboux, 1899 accepted as Subadyte pellucida (Ehlers, 1864) (subjective synonym)
22. Species Hermadion trochiscophora (Schmarda, 1861) accepted as Lepidonotus semitectus (Stimpson, 1855) (superseded recombination)
23. Species Hermadion truncata (Moore, 1902) accepted as Hermadionella truncata (Moore, 1902) (superseded subsequent combination)
24. Species Hermadion fauveli Gravier, 1918 (uncertain > taxon inquirendum)
25. Species Hermadion truncata (Czerniavsky, 1882) (uncertain > nomen dubium, not valid fide regional checklist)

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