(Zool.) A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans.
Echiuroidea
Echiuroidea
[‚ek·ē·yə′rȯid·ē·ə] (invertebrate zoology) A phylum of schizocoelous animals.