Echiuroidea
Echiuroidea is an order of annelids in the class Polychaeta.
Families
- Suborder Bonelliida
- *Bonelliidae Lacaze-Duthiers, 1858
- *Ikedidae Bock, 1942
- Suborder Echiurida
- *Echiuridae de Quatrefages, 1847
- *Thalassematidae Forbes & Goodsir, 1841
- *Urechidae Monro, 1927