Fig. 12From: Insights into the structure and morphogenesis of the giant basal spicule of the glass sponge Monorhaphis chuniOrganic net (ON) adhering to the surface (here shown above tuberculate layer surface). a General view. b, c Details showing organic net and its relation to incipient tubercles; note irregular meshes of the net and small spicules occurring below the net (b). d Details of organic net showing its fibrous natureBack to article page