| Suborder | Cyclopida Khodami, Mercado-Salas, Tang & Martinez Arbizu, 2019
| 15 204 3021 | Families Genera Species |
| Suborder | Ergasilida Khodami, Mercado-Salas, Tang & Martinez Arbizu, 2019
| 70 632 3781 | Families Genera Species |
| Superfamily | Cyclopoidea
| 0 4 2 | Families Genera Species |
| Family | Archinotodelphyidae Lang, 1949
| 2 22 | Genera Species |
| Family | Bradyophilidae
| 1 0 | Genus Species |
| Family | Chordeumiidae Boxshall, 1988
| 9 18 | Genera Species |
| Family | Cucumaricolidae Bouligand & Delamare-Deboutteville, 1959
| 1 2 | Genus Species |
| Family | Cyclopettidae Martínez Arbizu, 2000
| 3 12 | Genera Species |
| Family | Cyclopicinidae G.O. Sars, 1913 ⇒ Cyclopinidae
| 1 9 | Genus Species |
| Family | Cyclopinidae Sars, 1913
| 33 149 | Genera Species |
| Family | Grandiunguidae Pearse, 1852
| 0 0 | Genera Species |
| Family | Hemicyclopinidae Martínez Arbizu, 2001
| 6 22 | Genera Species |
| Family | Mantridae Leigh-Sharpe, 1934
| 3 3 | Genera Species |
| Family | Notodelphyidae Dana, 1852
| 104 519 | Genera Species |
| Family | Oithonidae Dana, 1852
| 9 121 | Genera Species |
| Family | Psammocyclopinidae Martínez Arbizu, 2001
| 2 7 | Genera Species |
| Family | Pterinopsyllidae G.O. Sars, 1913
| 1 0 | Genus Species |
| Family | Pteropsyllidae G.O. Sars, 1913 ⇒ Pterinopsyllidae
| 0 0 | Genera Species |
| Family | Smirnovipinidae Martínez Arbizu, 1997
| 4 5 | Genera Species |
| Family | Speleoithonidae da Rocha & Iliffe, 1991
| 1 3 | Genus Species |
| Family | Splanchnotropidae Izawa, 1976 ⇒ Splanchnotrophidae
| 0 0 | Genera Species |
| Family | Thaumatopsyllidae Sars, 1913
| 5 6 | Genera Species |
| Family | Thespesiopsyllidae C.B. Wilson, 1924
| 0 0 | Genera Species |
| Family | Umazuracolidae Ho, Ohtsuka & Nakadachi, 2006 accepted as Taeniacanthidae C.B. Wilson, 1911
| 0 0 | Genera Species |
| Family | Vaigamidae Thatcher & Robertson, 1984
| 0 0 | Genera Species |
| Family | Xenocoelomidae Bresciani & Lutzen, 1966
| 0 0 | Genera Species |
| Genus | Hesseius Özdikmen, 2008
| 1 | Species |
| Genus | Lobosomatium Stock, 1995
| 1 | Species |
| Genus | Myticola
| 0 | Species |
| Genus | Nisis Risso, 0
| 1 | Species |
| Genus | Parabotryllophilus Leigh-Sharpe, 1934
| 1 | Species |
| Genus | Pegesimallus Krøyer, 1863
| 0 | Species |
| Genus | Platythorax Hesse, 1866
| 0 | Species |
| Genus | Scotophilus Hesse, 1881
| 0 | Species |