- Porifera (meaning “pore bearer”).
- Asymmetrical or a few radially symmatrical
- Their bodies are full of pores and channels allowing water to circulate through them.
- Have unspecialized cells (not true tissue)
- Rely on maintaining a constant water flow through their bodies to obtain food and oxygen from their environment and to remove wastes.
- Adults are sessile
- Larval stage is motile (swims through the water)