The pericellular (silica) material fuses to a delimited and textured layer of silica with depressions approximately 20–30? μm in diameter. The cells release silica for controlled formation of a lamella. This spicule is composed of concentrically arranged lamellae that are approximately 10 ?μm thick…It is shown that the formation of an outermost lamella begins with the association of cell clusters with the surface of the thickening and/or growing spicule. “The giant basal spicule of the hexactinellid sponge Monorhaphis chuni represents the longest natural siliceous structure on Earth.
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