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Diatoms. The cell walls of diatoms are made of silica formed into their characteristic pillbox shape. Diatoms are composed of two valves or frustules, one on top of the other, within which the living matter of the diatom is found.
Diatoms acquired photosynthesis after the evolution of the chloroplast. Diatoms, photosynthesis protists that live in the ocean, possess strange chloroplasts with four membranes instead of two. The leading hypothesis explaining this is that the chloroplasts in diatoms actually represent eukaryotic cells that formed symbiosis with the diatoms. The inner two membranes represent the membranes of the regular chloroplasts contained in this symbiotic cell. The outer two membranes represent the plasma membraned of the symbiotic cell and the food vacuole it was trapped in.