1. Subgenus Thaumantias (Cosmetira) Forbes, 1848 accepted as Cosmetira Forbes, 1848 (elevated to full genus level)
   1. Species Thaumantias (Cosmetira) pilosella Forbes, 1848 accepted as Cosmetira pilosella Forbes, 1848
2. Species Thaumantias achroa Cobbold, 1858 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
3. Species Thaumantias aeronautica Forbes, 1848 accepted as Phialella quadrata (Forbes, 1848) (synonym)
4. Species Thaumantias cellularia (A. Agassiz, 1862) accepted as Mitrocoma cellularia (Agassiz, 1862)
5. Species Thaumantias confluens Forbes & Goodsir, 1853 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (synonym)
6. Species Thaumantias corynetes Gosse, 1853 accepted as Gossea corynetes (Gosse, 1853) accepted as Octobulbacea corynetes (Gosse, 1853)
7. Species Thaumantias cymbaloidea (Slabber, 1775) accepted as Phialella quadrata (Forbes, 1848)
8. Species Thaumantias cymbaloides (Slabber, 1775) accepted as Phialella quadrata (Forbes, 1848) (synonym, incorrect spelling of specific epithet)
9. Species Thaumantias eschscholtzii Haeckel, 1879 accepted as Tiaropsis multicirrata (M. Sars, 1835) (synonym)
10. Species Thaumantias globosa Forbes, 1848 accepted as Phialella quadrata (Forbes, 1848) (synonym)
11. Species Thaumantias hemispherica (Linnaeus, 1767) accepted as Clytia hemisphaerica (Linnaeus, 1767) (unaccepted combination)
12. Species Thaumantias inconspicua Forbes, 1848 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
13. Species Thaumantias lineata Forbes, 1848 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
14. Species Thaumantias lucida Forbes, 1848 accepted as Obelia lucifera (Forbes, 1848) (unaccepted > misspelling - incorrect subsequent spelling)
15. Species Thaumantias lucifera Forbes, 1848 accepted as Obelia lucifera (Forbes, 1848) (genus transfer)
16. Species Thaumantias maculata Forbes, 1848 accepted as Phialella quadrata (Forbes, 1848) (synonym)
17. Species Thaumantias maeotica Ostroumoff, 1896 accepted as Odessia maeotica (Ostroumoff, 1896) (basionym)
18. Species Thaumantias mediterranea Gegenbaur, 1857 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (synonym)
19. Species Thaumantias melanops Forbes, 1848 accepted as Tiaropsis multicirrata (M. Sars, 1835) (synonym)
20. Species Thaumantias multicirrata M. Sars, 1835 accepted as Tiaropsis multicirrata (M. Sars, 1835) (original combination)
21. Species Thaumantias pattersonii Green, 1857 accepted as Tiaropsis multicirrata (M. Sars, 1835) (synonym)
22. Species Thaumantias pileata Forbes, 1841 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
23. Species Thaumantias plana Sars, 1835 accepted as Obelia plana (M. Sars, 1835)
24. Species Thaumantias punctata Forbes, 1848 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
25. Species Thaumantias quadrata Forbes, 1848 accepted as Phialella quadrata (Forbes, 1848) (original combination)
26. Species Thaumantias sarnica Forbes, 1848 accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
27. Species Thaumantias undulata Forbes & Goodsir, 1853 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (basionym)
28. Species Thaumantias convexa Forbes, 1848 (uncertain > taxon inquirendum)
29. Species Thaumantias elsaeoswaldae Stechow, 1914 (uncertain > taxon inquirendum)
30. Species Thaumantias octona Forbes, 1848 (uncertain > taxon inquirendum)

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