| Scientific Name | Author | English Name |
|---|---|---|
| Calycella gracilis | Hartlaub, 1897 | |
| Calycella hispida | (Nutting, 1896) | |
| Calycella oligista | Ritchie, 1910 | |
| Calycella syringa | (Linnaeus, 1767) | Creeping bell hydroid |
| Campanulina indivisa | unspecified | |
| Campanulina pumila | (Clark, 1875) | |
| Egmundella magellanica | Galea et al., 2019 | |
| Eutimalphes brownei | Torrey, 1909 | |
| Eutimalphes pretiosa | Haeckel, 1879 | |
| Eutonina indicans | (Romanes, 1876) | Aggregating jelly |
| Eutonina scintillans | (Bigelow, 1909) | |
| Helgicirrha brevistyla | Xu & Huang, 1984 | |
| Helgicirrha cari | (Haeckel, 1864) | |
| Helgicirrha cornelli | Bouillon, 1984 | |
| Helgicirrha danduensis | (Bigelow, 1904) | |
| Helgicirrha gemmifera | Bouillon, 1984 | |
| Helgicirrha irregularis | Bouillon, Boero & Seghers, 1988 | |
| Helgicirrha malayensis | (Stiasny, 1928) | |
| Helgicirrha medusifera | (Bigelow, 1909) | |
| Helgicirrha schulzei | Hartlaub, 1909 | |
| Lafoeina amirantensis | (Millard & Bouillon, 1973) | |
| Lafoeina longitheca | Jäderholm, 1904 | |
| Lafoeina maxima | Levinsen, 1893 | |
| Lafoeina tenuis | Sars, 1874 | |
| Opercularella belgicae | (Hartlaub, 1904) | Belgica's hydroid |
| Opercularella denticulata | (Clarke, 1907) | |
| Opercularella hispida | Nutting, 1898 | |
| Opercularella humilis | (Bale, 1924) | |
| Opercularella lacerata | (Johnson, 1847) | |
| Opercularella rugosa | (Nutting, 1901) | |
| Oplorhiza gracilis | (Stechow, 1921) | |
| Oplorhiza parvula | Allman, 1877 | |
| Tetrapoma quadridentatum | (Hincks, 1874) | |
| Tripoma arboreum | Hirohito, 1995 |