(n.pl.) A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Echiuroidea. Retrieved September 24, 2026, from http://smartdefine.org/echiuroidea/definitions/2001477 |
| Chicago | Webster's. 2011. "Echiuroidea" http://smartdefine.org/echiuroidea/definitions/2001477 (accessed September 24, 2026). |
| Harvard | Webster's 2011, Echiuroidea, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/echiuroidea/definitions/2001477>. |
| MLA | Webster's. "Echiuroidea" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/echiuroidea/definitions/2001477> |