| Nominal Species (n = 37) | Present allocation (n = 34) | Ref. |
|---|---|---|
| Oithona aruensis Früchtl, 1923 | Oithona aruensis | 3477 |
| Oithona atlantica Farran, 1908 | Oithona atlantica | 19 |
| Oithona attenuata Farran, 1913 | Oithona attenuata | 19 |
| Oithona brevicornis Giesbrecht, 1891 | Oithona brevicornis | 19 |
| Oithona brevicornis minor Nishida, Tanaka & Omori, 1977 | Oithona aruensis | 3477 |
| Oithona colcarva Bowman, 1975 | Oithona colcarva | 19 |
| Oithona davisae Ferrari & Orsi, 1984 | Oithona davisae | 19 |
| Oithona decipiens Farran, 1913 | Oithona decipiens | 19 |
| Oithona dissimilis Lindberg, 1940 | Oithona dissimilis | 3477 |
| Oithona dissimilis oceanica Lindberg, 1947 | Oithona dissimilis | 3477 |
| Oithona fallax Farran, 1913 | Oithona fallax | 19 |
| Oithona fonsecae Ferrari & Bowman, 1980 | Oithona fonsecae | 87203 |
| Oithona fragilis Nishida, 1979 | Oithona fragilis | 19 |
| Oithona frigida Giesbrecht, 1902 | Oithona frigida | 19 |
| Oithona frigida pseudofrigida Rosendorn, 1917 | Oithona pseudofrigida | 3477 |
| Oithona hamata Rosendorn | Oithona hamata | 19 |
| Oithona hebes Giesbrecht, 1891 | Oithona hebes | 19 |
| Oithona helgolandica Claus, 1863 | Oithona helgolandica | 19 |
| Oithona linearis Giesbrecht, 1891 | Oithona linearis | 19 |
| Oithona longispina Nishida, Tanaka & Omori, 1977 | Oithona longispina | 19 |
| Oithona minuta Krichagin, 1877 | Oithona minuta | 19 |
| Oithona nana Giesbrecht, 1892 | Oithona nana | 19 |
| Oithona oculata Farran, 1913 | Dioithona oculata | 19 |
| Paroithona parvula Farran, 1908 | Paroithona parvula | 19 |
| Oithona plumifera Baird, 1843 | Oithona plumifera | 19 |
| Oithona pseudofrigida Rosendorn, 1917 | Oithona pseudofrigida | 3477 |
| Paroithona pulla Farran, 1913 | Paroithona pulla | 19 |
| Oithona rigida Giesbrecht, 1896 | Oithona rigida | 19 |
| Oithona robusta Giesbrecht, 1891 | Oithona robusta | 19 |
| Oithona setigera Dana, 1852 | Oithona setigera | 19 |
| Oithona similis Claus, 1866 | Oithona similis | 19 |
| Oithona simplex Farran, 1913 | Oithona simplex | 19 |
| Oithona spinirostris Claus, 1863 | Oithona spinirostris | 19 |
| Oithona tenuis Rosendorn, 1917 | Oithona tenuis | 19 |
| Limnoithona tetraspina Zhang & Li, 1976 | Limnoithona tetraspina | 19 |
| Oithona vivida Farran, 1913 | Oithona vivida | 19 |
| Oithona wellershausi Ferrari, 1982 | Oithona wellershausi | 3477 |