Because of the simple cells that make up sponges, cell types and water currents used by the sponges to obtain food have been extensively studied. Sponges in general use flagellated cells called choanocyte cells to create a current. Choanocytes are located in the interior part of the sponge. In the asconoid structure, the water is drawn in through the ostium (outer pores), goes through the spongocoel or atrium, and out the osculum (the opening in the top of the sponge). Outer pores are 50 micrometers or less, so larger particles and animals are not ingested.
As food or particles are moved through the sponges, amoemoid cells surround and engulf it (pinocytosis and phagocytosis). Particles are caught in the collar part of the choanocyte cells.
Foraging Behavior: filter-feeding
Primary Diet: planktivore ; detritivore