1. Species Medusa aequorea Forsskål, 1775 accepted as Aequorea forskalea Péron & Lesueur, 1810 (invalid junior homonym of Medusa aequorea Linnaeus, 1758)
2. Species Medusa andromeda Forskål, 1775 accepted as Cassiopea andromeda (Forskål, 1775) (synonym)
3. Species Medusa aurita Linnaeus, 1758 accepted as Aurelia aurita (Linnaeus, 1758) (basionym)
4. Species Medusa beroe Linnaeus, 1758 accepted as Beroe beroe (Linnaeus, 1758) (unaccepted > superseded combination)
5. Species Medusa cacuminata Modeer, 1791 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (indetermiante species, likely synonym)
6. Species Medusa caliparea Reynaud, 1830 accepted as Chrysaora caliparea (Reynaud, 1830) (synonym)
7. Species Medusa campanula Fabricius, 1780 accepted as Catablema vesicarium (A. Agassiz, 1862) (possible synonym, doubtful species)
8. Species Medusa campanulata Chamisso, 1821 accepted as Polyorchis penicillatus (Eschscholtz, 1829) (not in use)
9. Species Medusa capillata Linnaeus, 1758 accepted as Cyanea capillata (Linnaeus, 1758) (basionym)
10. Species Medusa cephea Forskål, 1775 accepted as Cephea cephea (Forskål, 1775) (synonym)
11. Species Medusa cruciata Forsskål, 1775 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (indeterminate species, possible synonym)
12. Species Medusa crucigera Gmelin, 1788 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (indeterminate species, possible synonym)
13. Species Medusa cymbaloidea Slabber, 1775 accepted as Phialella quadrata (Forbes, 1848) (synonym)
14. Species Medusa digitale O. F. Müller, 1776 accepted as Aglantha digitale (O. F. Müller, 1776) (basionym)
15. Species Medusa duodecilia Dalyell, 1847 accepted as Bougainvillia principis (Steenstrup, 1850) (questionable synonym)
16. Species Medusa fimbriata Dalyell, 1848 accepted as Obelia fimbriata (Dalyell, 1848) (basionym)
17. Species Medusa frondosa Pallas, 1774 accepted as Cassiopea frondosa (Pallas, 1774) (synonym)
18. Species Medusa fulgida Reynaud, 1830 accepted as Chrysaora fulgida (Reynaud, 1830) (synonym)
19. Species Medusa hemisphaerica Linnaeus, 1767 accepted as Clytia hemisphaerica (Linnaeus, 1767) (basionym)
20. Species Medusa hyacinthina Faber, 1829 accepted as Periphylla periphylla (Péron & Lesueur, 1810) (synonym)
21. Species Medusa hysoscella Linnaeus, 1767 accepted as Chrysaora hysoscella (Linnaeus, 1767) (basionym)
22. Species Medusa marginata Modeer, 1791 accepted as Maeotias marginata (Modeer, 1791) (basionym)
23. Species Medusa marsupialis Linnaeus, 1758 accepted as Carybdea marsupialis (Linnaeus, 1758) (basionym)
24. Species Medusa mollicina Forsskål, 1776 accepted as Pegantha mollicina (Forsskål, 1775) (basionym)
25. Species Medusa mucilaginosa Chamisso & Eysenhardt, 1821 accepted as Cunina mucilaginosa (Chamisso & Eysenhardt, 1821)
26. Species Medusa noctiluca Forsskål, 1775 accepted as Pelagia noctiluca (Forsskål, 1775) (basionym)
27. Species Medusa ocellata Modeer, 1791 accepted as Mastigias ocellatus (Modeer, 1791) (synonym)
28. Species Medusa ocilia Dalyell, 1847 accepted as Bougainvillia muscus (Allman, 1863) (possible synonym)
29. Species Medusa octocilia Dalyell, 1847 accepted as Bougainvillia muscus (Allman, 1863) (possible synonym)
30. Species Medusa octopus Gmelin, 1791 accepted as Rhizostoma octopus (Gmelin, 1791) (synonym)
31. Species Medusa octostyla Forskål, 1775 accepted as Cephea octostyla (Forskål, 1775) (synonym)
32. Species Medusa palliata Fabricius, 1779 accepted as Adamsia palliata (Fabricius, 1779) accepted as Calliactis palliata (Müller, 1776)
33. Species Medusa perla Slabber, 1769 accepted as Pelagia noctiluca (Forsskål, 1775) (unaccepted > junior subjective synonym, synonym)
34. Species Medusa persea Forsskål, 1775 accepted as Aurelia persea (Forsskål, 1775) (unaccepted > superseded combination, synonym)
35. Species Medusa pileata Forsskål, 1775 accepted as Neoturris pileata (Forsskål, 1775) (basionym)
36. Species Medusa pocillum Montagu, 1815 accepted as Velella velella (Linnaeus, 1758) (synonym)
37. Species Medusa porpita Linnaeus, 1758 accepted as Porpita porpita (Linnaeus, 1758) (basionym)
38. Species Medusa proboscidalis Forsskål, 1775 accepted as Geryonia proboscidalis (Forsskål, 1775) (genus transfer)
39. Species Medusa proboscidea Dalyell, 1847 accepted as Sarsia tubulosa (M. Sars, 1835) (synonym)
40. Species Medusa pulmo Gmelin, 1788 accepted as Rhizostoma pulmo (Macri, 1778) (synonym)
41. Species Medusa purpurea Pennant, 1777 accepted as Aurelia aurita (Linnaeus, 1758)
42. Species Medusa purpurea [Renier], [1804] (unaccepted > unavailable name, published in an unavailable publication fide ICZN Opinion 316.)
43. Species Medusa saltatrix Tilesius, 1818 accepted as Spirocodon saltatrix (Tilesius, 1818) (basionym)
44. Species Medusa sanguinolenta Modeer, 1791 accepted as Turritopsis polycirrha (Keferstein, 1862) (possible synonym)
45. Species Medusa tuberculata Gmelin, 1788 accepted as Cotylorhiza tuberculata (Macri, 1778) (synonym)
46. Species Medusa umbella Müller, 1776 accepted as Porpita porpita (Linnaeus, 1758) (synonym)
47. Species Medusa unguiculata Swartz, 1788 accepted as Linuche unguiculata (Swartz, 1788) (synonym)
48. Species Medusa utriculus Gmelin, 1788 accepted as Physalia utriculus (Gmelin, 1788) accepted as Physalia physalis (Linnaeus, 1758) (synonym)
49. Species Medusa velella Linnaeus, 1758 accepted as Velella velella (Linnaeus, 1758) (basionym)
50. Species Medusa aequorea Linnaeus, 1758 (uncertain > taxon inquirendum, unidentifiable)
51. Species Medusa stelligera Ehrenberg, 1835 (uncertain > unassessed)

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