What are the major cell types in sponges?

Sponges primarily consist of three major cell types: choanocytes, amoebocytes, and pinacocytes. Choanocytes, or collar cells, are responsible for capturing food particles and creating water currents through the sponge. Amoebocytes play a versatile role, aiding in digestion, nutrient distribution, and reproduction. Pinacocytes form the outer protective layer of the sponge, providing structure and regulating water flow.