31. The spicules are composed solely of strongyles, cylindrical in shape with rounded ends. 32. More commonly, the mesohyl is stiffened by spicules , by spongin fibers or both. 33. For example, it is uncertain whether the ancestral mollusc was embryological origins of spicules . 34. The tissues of this tunicate are strengthened by the presence of two types of spicules . 35. The body of the sponge consists of a spicule and fibers and is water absorbent. 36. Trabeculae are the tiny spicules of bone crisscrossing the cancellous bone that make it look spongy. 37. Its color is white with variable amounts of bright yellow dots on top of the spicules . 38. Sponge skeletons consist of either spongin or calcareous and siliceous spicules with some collagen molecules interspersed. 39. It is the combination of spicule forms within a sponge s tissues that helps identify the species. 40. The silica spicules fossilised with the sponges makes the material hazardous to handle by being highly abrasive.
