Spicules are small, spike-like structures found in various organisms, including sponges and some marine animals. In sponges, spicules serve as a skeletal framework, providing structural support and protection. They are made of calcium carbonate or silica and come in various shapes and sizes.
Spicules help maintain the sponge’s shape and prevent it from collapsing. They also deter predators by making the sponge difficult to consume. Additionally, spicules can aid in the sponge’s defense mechanism by causing irritation to potential threats.
In marine animals like sea cucumbers, spicules are part of the skin and contribute to the animal’s texture and defense. They can also play a role in locomotion and sensory functions.
Overall, spicules are essential for the structural integrity and survival of the organisms that possess them.