| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Apistobranchidae | 66776 | Mesnil and Caullery, 1898 | | ITIS | valid | | Family |
| Chaetopteridae | 67095 | Audouin and Milne-Edwards, 1833 | | ITIS | valid | | Family |
| Disomidae | 67070 | Mesnil, 1897 | | ITIS | invalid | junior synonym of Trochochaetidae | Family |
| Heterospionidae | 67086 | Hartman, 1963 | | ITIS | invalid | junior synonym of Longosomatidae | Family |
| Longosomatidae | 555676 | Hartman, 1944 | | ITIS | valid | | Family |
| Magelonidae | 67042 | Cunningham and Ramage, 1888 | | ITIS | valid | | Family |
| Poecilochaetidae | 67080 | Hannerz, 1956 | | ITIS | valid | | Family |
| Spionidae | 66781 | Grube, 1850 | | ITIS | valid | | Family |
| Trochochaetidae | 67069 | Pettibone, 1963 | | ITIS | valid | | Family |
| Uncispionidae | 68387 | Green, 1982 | | ITIS | valid | | Family |
