| Family | Ascidicolidae Thorell, 1860
| 30 253 | Genera Species |
| Family | Botryllophilidae G.O. Sars, 1921 ⇒ Ascidicolidae
| 6 4 | Genera Species |
| Family | Buproridae Thorell, 1859
| 2 4 | Genera Species |
| Family | Catlaphilidae Tripathi, 1960 ⇒ Lernaeidae
| 0 0 | Genera Species |
| Family | Cyclopidae Rafinesque, 1815 Copepods | 114 2496 | Genera Species |
| Family | Doropygidae Brady, 1878
| 0 0 | Genera Species |
| Family | Enterocolidae Della Valle, 1883 ⇒ Enteropsidae
| 0 0 | Genera Species |
| Family | Enterognathidae Illg & Dudley, 1980
| 4 8 | Genera Species |
| Family | Enteropsidae Thorell, 1859
| 14 31 | Genera Species |
| Family | Euryteidae Monchenko, 1974
| 0 0 | Genera Species |
| Family | Fratiidae Ho, Conradi & López-González, 1998
| 1 1 | Genus Species |
| Family | Halicyclopidae Kiefer, 1927
| 0 0 | Genera Species |
| Family | Haplostomidae ⇒ Botryllophilidae
| 0 0 | Genera Species |
| Family | Lernaeidae Cobbold, 1879
| 32 222 | Genera Species |
| Family | Ozmanidae Ho & Thatcher, 1989
| 1 2 | Genus Species |