Usually occurs in sessile colonies

• Primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework

Wiktionary Word definitions in Wiktionary
n. (context zoology English) Any sponge (of the subkingdom Parazoa)

WordNet Word definitions in WordNet
n. primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies [syn: sponge , poriferan ] [also: parazoa (pl)]