Spicule Images: Drawings of spicules and of skeleton of material from Colombia. a) Spicules from Islas del Rosario (oxea and centrangulate toxiform raphides); b) from Santa Marta (only oxeas); c) and d) tangential view of the ectosome; e) perpendicular section at the surface (from Zea, 1987, figure 38, as Pellina carbonaria).