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