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