Sclerocytes are spicule secreting cells, found in sponges. They secrete calcareous or siliceous spicules which are found in the mesohyl layer of sponges. The sclerocytes produce spicules via formation of a cellular triad. The triad of cells then undergo mitosis, creating six sclerocytes. In pairs, the sclerocytes secrete the minerals which create the spicules.

• http://acd.ufrj.br/labpor/4-Bibliografia/Pdfs/Imsiecke95a.pdf