Spicule Images: Drawings of spicules and of skeleton of material from Colombia. a) Spicules from Old Providence; b) spicules from Islas del Rosario; c) tangential view of the ectosome; d) longitudinal cross-section of a branchelet (material from Islas del Rosario); e) fibers cored by spicules and debris (material from Old Providence) (From Zea, 1987, figure 66, as Ulosa funicularis).