| Nominal Species (n = 73) | Present allocation (n = 70) | Ref. |
|---|---|---|
| Hydrocorella africana Stechow, 1921 | Hydrocorella africana | 19 |
| Hydractinia aggregata Fraser, 1911 | Hydractinia aggregata | 19 |
| Hydractinia allmani Bonnevie, 1898 | Schuchertinia allmanii | 19 |
| Hydractinia altispina Millard, 1955 | Hydractinia altispina | 8278 |
| Hydractinia angusta Hartlaub, 1904 | Hydractinia angusta | 8278 |
| Hydractinia antonii Miglietta, 2006 | Hydractinia antonii | 7479 |
| Podocoryne apicata Kramp, 1959 | Podocoryne apicata | 19 |
| Hydractinia armata Fraser, 1940 | Hydractinia armata | 19 |
| Oceania armata Kolliker, 1853 | Oceania armata | 19 |
| Hydractinia bayeri Hirohito, 1984 | Hydractinia bayeri | 8278 |
| Podocoryne bella Hand, 1861 | Podocoryne bella | 19 |
| Hydractinia californica Torrey, 1904 | Hydractinia californica | 19 |
| Hydractinia canalifera Millard, 1957 | Hydractinia canalifera | 8278 |
| Hydractinia carica Bergh, 1887 | Hydractinia carica | 19 |
| Podocoryna carnea Sars, 1846 | Podocoryna carnea | 3477 |
| Podocoryne carnea Sars, 1846 | Podocoryna carnea | 19 |
| Hydractinia carolinae Fraser, 1912 | Hydractinia carolinae | 19 |
| Stylactis claviformis Bouillon, 1965 | Stylactis claviformis | 19 |
| Tubiclava cornucopiae Norman, 1864 | Merona cornucopiae | 19 |
| Hydractinia cryptogonia Hirohito, 1988 | Hydractinia cryptogonia | 8278 |
| Hydractinia dendritica Hickson & Gravely, 1907 | Hydractinia dendritica | 8278 |
| Hydractinia diogenes Millard, 1959 | Hydractinia diogenes | 8278 |
| Hydractinia disjuncta Fraser, 1938 | Hydractinia disjuncta | 8278 |
| Hydractinia epiconcha Stechow, 1907 | Hydractinia epiconcha | 8278 |
| Hydractinia epispongia Fraser, 1938 | Hydractinia epispongia | 8278 |
| Rhizogeton ezoense Yamada, 1964 | Rhizogeton ezoense | 8278 |
| Turritopsis fascicularis Fraser, 1943 | Turritopsis fascicularis | 19 |
| Tubiclava fruticosa Allman, 1897 | Tubiclava rubra | 88965 |
| Corydendrium fruticosum Fraser, 1914 | Corydendrium fruticosum | 19 |
| Rhizogeton fusiformis Agassiz, 1862 | Rhizogeton fusiformis | 19 |
| Hydractinia galeai Calder & Watling, 2021 | Hydractinia galeai | 3477 |
| Hydractinia granulata Hirohito, 1988 | Hydractinia granulata | 8278 |
| Hydractinia hancocki Fraser, 1938 | Hydractinia hancocki | 8278 |
| Hydractinia humilis Bonnevie, 1898 | Hydractinia humilis | 8278 |
| Hydractinia laevispina Fraser, 1911 | Hydractinia laevispina | 8278 |
| Turritopsis lata Van Lendenfeld, 1884 | Turritopsis lata | 19 |
| Tubiclava laxa Fraser, 1938 | Merona laxa | 19 |
| Hydractinia leizhouensis Huang, Zhang et Yang, 2020 | Hydractinia leizhouensis | 3477 |
| Clava leptostyla Agassiz, 1860 | Clava leptostyla | 19 |
| Hydractinia longispina Fraser, 1938 | Hydractinia longispina | 8278 |
| Tubiclava lucerna Allman, 1863 | Tubiclava lucerna | 19 |
| Podocoryne meteoris Thiel, 1938 | Podocoryne meteoris | 19 |
| Hydractinia milleri Torrey, 1902 | Hydractinia milleri | 19 |
| Janaria mirabilis Stechow, 1921 | Janaria mirabilis | 1663 |
| Hydractinia monocarpa Allman, 1847 | Hydractinia monocarpa | 19 |
| Hydractinia multispina Fraser, 1938 | Hydractinia multispina | 19 |
| Rhizogeton nematophorum Antsulevich, 1986 | Rhizogeton nematophorum | 1663 |
| Hydractinia novaezelandiae Schuchert, 1996 | Hydractinia novaezelandiae | 8278 |
| Rhizogeton nudum Broch, 1910 | Rhizogeton nudum | 1663 |
| Turritopsis nutricula Mccrady, 1859 | Turritopsis nutricula | 19 |
| Hydractinia ornata Bonnevie, 1899 | Schuchertinia allmanii | 75097 |
| Hydractinia pacifica Hartlaub, 1905 | Hydractinia pacifica | 8278 |
| Hydractinia parvispina Hartlaub, 1905 | Hydractinia parvispina | 19 |
| Hydractinia polycarpa Fraser, 1938 | Hydractinia polycarpa | 19 |
| Hydractinia polyclina Agassiz, 1862 | Hydractinia polyclina | 1663 |
| Hydractinia prolifica Fraser, 1948 | Hydractinia prolifica | 19 |
| Hydractinia quadrigemina Fraser, 1938 | Hydractinia quadrigemina | 8278 |
| Tubiclava rubra Farquhar, 1895 | Tubiclava rubra | 19 |
| Hydractinia rubricata Schuchert, 1996 | Hydractinia rubricata | 8278 |
| Hydractinia rugosa Fraser, 1938 | Hydractinia rugosa | 8278 |
| Latebrahydra schulzei Calder & Watling, 2021 | Latebrahydra schulzei | 3477 |
| Podocoryne selena Mills, 1976 | Hydractinia selena | 19 |
| Hydractinia serrata Kramp, 1943 | Hydractinia serrata | 8278 |
| H. simplex Kramp, 1928 | Hydractinia minuta | 75097 |
| Hydractinia simplex Kramp, 1928 | Hydractinia minima | 75097 |
| Podocoryne simplex Kramp, 1928 | Podocoryne simplex | 19 |
| Hydractinia sodalis Stimpson, 1858 | Hydractinia sodalis | 8278 |
| Rhizodendrium sterreri Calder, 1988 | Rhizodendrium sterreri | 813 |
| Hydractinia symbiolongicarpus Buss & Yund, 1989 | Hydractinia symbiolongicarpus | 1663 |
| Hydractinia symbiopollicaris Buss & Yund, 1989 | Hydractinia symbiopollicaris | 1663 |
| Tubiclava triserialis Fraser, 1938 | Tubiclava triserialis | 19 |
| Hydractinia valens Fraser, 1941 | Hydractinia valens | 19 |
| Hydractinia vallini Jäderholm, 1926 | Hydractinia vallini | 8278 |