Sponges belong to phylum Porifera.
Different cell types and their functions are as follows:
1. Pinacocytes - It forms the outer layer of the sponge. It sometimes helps in phagocytosis of food particles.
2. Lophocyte or Collenocyte - these cells secretes collagen.
3. Porocyte - it controls the water flow through ostia.
4. Amoebocyte - provides nutrients to the cell.
5. Chanocyte - generates water current and filters food particles from water.
6. Sclerocyte - secretes silica spicules.
7. Oocyte - egg cell.
