Leuconoid
Leuconoid Sponges are the most complex form of sponges. They lose radial symmetry, and they are irregular in their shape. They can achieve very large sizes. They have even more channels allowing for further increase in surface area. That makes these sponges highly efficient in moving and filtering water. The largest sponges are leuconoid sponges because they have eliminated the spongocoel. This means all the water entering the sponge is moved through small canals all lined with flagella, making it the most hydrologically efficient method.