1. Family [Unassigned]
   1. Genus Cnidocodon Bouillon, 1978
   2. Genus Oonautes Damas, 1937
   3. Genus Paulinum Brinckmann-Voss & Arai, 1998
   4. Genus Rhabdoon Keferstein & Ehlers, 1861
   5. Genus Tetraralphia Pagès & Bouillon, 1997
   6. Genus Blastothela Verrill, 1878 accepted as Candelabrum de Blainville, 1830 (synonym)
   7. Genus Microcampana Fewkes, 1889 accepted as Corymorpha M. Sars, 1835 (possible synonym)
   8. Genus Pararhysomedusa Shirley & Leung, 1970 accepted as Rhabdoon Keferstein & Ehlers, 1861 (synonym)
   9. Genus Plankayon Wagner, 1880 accepted as Plotocnide Wagner, 1885 (invalid as based on nomen nudum)
   10. Genus Ramus Zhang & Wu, 1981 accepted as Cnidocodon Bouillon, 1978 (synonym)
   11. Genus Rhysomedusa Vannucci & Soares Moreira, 1966 accepted as Rhabdoon Keferstein & Ehlers, 1861 (synonym)
   12. Genus Yakovia Margulis, 1989 accepted as Rhabdoon Keferstein & Ehlers, 1861 (synonym)

1. Family Acaulidae Fraser, 1924
2. Family Boeromedusidae Bouillon, 1995
3. Family Boreohydridae Westblad, 1947
4. Family Candelabridae Stechow, 1921
5. Family Corymorphidae Allman, 1872
6. Family Hydridae Dana, 1846
7. Family Margelopsidae Mayer, 1910
8. Family Paracorynidae Picard, 1957
9. Family Protohydridae Allman, 1888
10. Family Tubulariidae Goldfuss, 1818
11. Family Amalthaeidae Haeckel, 1879 accepted as Corymorphidae Allman, 1872 (synonym)
12. Family Branchiocerianthidae Broch, 1916 accepted as Corymorphidae Allman, 1872 (unaccepted > junior subjective synonym)
13. Family Hybocodonidae Allman, 1872 accepted as Tubulariidae Goldfuss, 1818 (synonym)
14. Family Monocaulidae Allman, 1872 accepted as Corymorphidae Allman, 1872 (synonym)
15. Family Myriothelidae Hincks, 1868 accepted as Candelabridae Stechow, 1921 (synonym)
16. Family Pelagohydridae Dendy, 1902 accepted as Margelopsidae Mayer, 1910 (not in use)
17. Family Symplectaneidae Fraser, 1941 accepted as Candelabridae Stechow, 1921 (synonym)
18. Family Tubulariae Goldfuss, 1818 accepted as Tubulariidae Goldfuss, 1818 (old spelling)
19. Superfamily Tubulariida accepted as Tubulariidae Goldfuss, 1818 (unfounded grouping)

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