- Members of this phylum are commonly known as sponges.
- Waterenters in the body of sponges through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the
- Choanocytes or collar cells line the spongocoel and the canals.
- Digestion is intracellular, skeleton made up of spicules or spongin fibres, they are hermaphrodites.
- Sponges reproduce asexually by fragmentation and sexually by formation of gametes, fertilization is internal and development is indirect.
Examples- Sycon (Scypha), Spongilla (Fresh water sponge)
Fig. Fresh water sponge