Sponges (also known as sea sponges), the members of the phylum Porifera (/pəˈrɪfərəˌ pɔː-/ pər-IF-ər-ə, por-; … See more

The term sponge derives from the Ancient Greek word σπόγγος spóngos. See more

Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs. Some of them are radially symmetrical, but most are a… See more

Sponges constitute the phylum Porifera, and have been defined as sessile metazoans (multicelled immobile animals) that have water intake and outlet openings connected by chambers lined with choanocytes, cells with whip-li… See more