Definitions for "Porifera"
A grand division of the Invertebrata, including the sponges; -- called also Spongiæ, Spongida, and Spongiozoa. The principal divisions are Calcispongiæ, Keratosa or Fibrospongiæ, and Silicea.
The phylum comprising the sponges.
A sponge has a system of holes and canals the animal uses to circulate water through its body. Sponges are multicellular but because its cells are not organized into tissues, they are considered "primitive" animals. No entries for this letter.