(n.pl.) A grand division of the Invertebrata, including the sponges; -- called also Spongiae, Spongida, and Spongiozoa. The principal divisions are Calcispongiae, Keratosa or Fibrospongiae, and Silicea.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Porifera. Retrieved September 23, 2026, from http://smartdefine.org/porifera/definitions/2047577 |
| Chicago | Webster's. 2011. "Porifera" http://smartdefine.org/porifera/definitions/2047577 (accessed September 23, 2026). |
| Harvard | Webster's 2011, Porifera, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/porifera/definitions/2047577>. |
| MLA | Webster's. "Porifera" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/porifera/definitions/2047577> |