Echiuroidea
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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