| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Bonelliidae | 154975 | Lacaze-Duthiers, 1858 | | ITIS | valid | | Family |
| Echiuridae | 155045 | Quatrefages, 1847 | | ITIS | valid | | Family |
| Echiuroidea | 154974 | Segdwick, 1898 | spoon worms | ITIS | invalid | other, see comments of Echiuroinea | Order |
| Heteromyota | 155149 | Fisher, 1946 | | ITIS | invalid | other, see comments of Echiuroinea | Order |
| Ikedaidae | 155150 | Dawydoff, 1959 | | ITIS | invalid | unavailable, literature misspelling of Echiuridae | Family |
| Ikedidae | 705713 | Bock, 1942 | | ITIS | invalid | junior synonym of Echiuridae | Family |
