Pinacocytes: These cells form the outer layer of the sponge and help regulate the flow of water.

Porocytes: These tubular cells create pores (ostia) through which water enters the sponge.

Archaeocytes: Also known as amoebocytes, these versatile cells can transform into other cell types and are involved in digestion, reproduction, and repair.

Sclerocytes: These cells produce spicules, which are structural elements that provide support and deter predators.

Spongocytes: These cells produce spongin fibers, which contribute to the sponge's flexible skeleton.

Choanocytes: Also known as collar cells, these cells have flagella that create water currents and trap food particles for digestion.

Review: Biol 121 A Final exam Chapter 6-8