1. Subgenus Phialidium (Phialucium) Maas, 1905 accepted as Phialucium Maas, 1905
2. Species Phialidium bicophorum (L. Agassiz, 1862) accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
3. Species Phialidium brunescens (Bigelow, 1904) accepted as Clytia brunescens (Bigelow, 1904)
4. Species Phialidium chengshanense (Ling, 1937) accepted as Sugiura chengshanense (Ling, 1937)
5. Species Phialidium cruciferum Annandale, 1915 accepted as Clytia crucifera (Annandale, 1915) (basionym)
6. Species Phialidium discoida (Mayer, 1900) accepted as Clytia discoida (Mayer, 1900) (incorrect suffix)
7. Species Phialidium discoideum (Mayer, 1900) accepted as Clytia discoida (Mayer, 1900) (synonym)
8. Species Phialidium folleatum (McCrady, 1859) accepted as Clytia folleata (McCrady, 1859) (synonym)
9. Species Phialidium gelatinosum (Mayer, 1900) accepted as Clytia gelatinosa (Mayer, 1900) (unaccepted genus)
10. Species Phialidium globosum (Mayer, 1900) accepted as Clytia globosa (Mayer, 1900)
11. Species Phialidium gregarium (Agassiz, 1862) accepted as Clytia gregaria (Agassiz, 1862) (genus transfer)
12. Species Phialidium hemisphaericum (Linnaeus, 1767) accepted as Clytia hemisphaerica (Linnaeus, 1767) (unaccepted combination)
13. Species Phialidium iridescens Maas, 1906 accepted as Clytia iridescens (Maas, 1906)
14. Species Phialidium islandicum Kramp, 1919 accepted as Clytia islandica (Kramp, 1919) (basionym)
15. Species Phialidium kincaidi (Nutting, 1899) accepted as Clytia kincaidi (Nutting, 1899)
16. Species Phialidium languidum (A. Agassiz, 1862) accepted as Clytia languida (A. Agassiz, 1862) accepted as Clytia hemisphaerica (Linnaeus, 1767)
17. Species Phialidium lomae Torrey, 1909 accepted as Clytia lomae (Torrey, 1909) (basionym)
18. Species Phialidium maccreadyi (Brooks, 1888) accepted as Phialidium mccradyi (Brooks, 1888) accepted as Clytia mccradyi (Brooks, 1888) (misspelling)
19. Species Phialidium malayense Kramp, 1961 accepted as Clytia malayense (Kramp, 1961) (basionym)
20. Species Phialidium mccradyi (Brooks, 1888) accepted as Clytia mccradyi (Brooks, 1888) (unaccepted combination)
21. Species Phialidium minutum (Nutting, 1901) accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
22. Species Phialidium noliforme (McCrady, 1859) accepted as Clytia noliformis (McCrady, 1859) sensu Calder, 1991 (unaccepted combination)
23. Species Phialidium ovale (Mayer, 1900) accepted as Multioralis ovalis Mayer, 1900 (unaccepted combination)
24. Species Phialidium ovalis (Mayer, 1910) accepted as Multioralis ovalis Mayer, 1900 (unaccepted genus)
25. Species Phialidium pentata (Mayer, 1900) accepted as Pseudoclytia pentata Mayer, 1900 accepted as Clytia folleata (McCrady, 1859)
26. Species Phialidium simplex Browne, 1902 accepted as Clytia simplex (Browne, 1902)
27. Species Phialidium simplex Uchidai, 1947 accepted as Clytia uchidai (Kramp, 1961) (invalid junior homonym of Phialidium simplex Browne, 1902)
28. Species Phialidium singulare (Mayer, 1900) accepted as Clytia singulare (Mayer, 1900) (unaccepted combination)
29. Species Phialidium tenue Browne, 1905 accepted as Eirene tenuis (Browne, 1905) (basionym)
30. Species Phialidium uchidai Kramp, 1961 accepted as Clytia uchidai (Kramp, 1961) (basionym)
31. Species Phialidium uchodai Kramp, 1961 accepted as Phialidium uchidai Kramp, 1961 accepted as Clytia uchidai (Kramp, 1961) (spelling error)
32. Species Phialidium variabile (Claus, 1864) accepted as Clytia hemisphaerica (Linnaeus, 1767) (synonym)
33. Species Phialidium viridicans Leuckart, 1856 accepted as Clytia viridicans (Leuckart, 1956) accepted as Clytia hemisphaerica (Linnaeus, 1767) (basionym)
34. Species Phialidium temporarium Browne, 1896 (uncertain > taxon inquirendum)

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