👉 Calathians are a group of marine animals that include sea cucumbers, sea anemones, and other invertebrates. They are typically found in warm coastal waters near the equator, where they can survive for long periods without food or water. Calathians are characterized by their unique shape, which is often flattened and has a smooth surface. Their bodies are made of hard, fibrous tissue called calathoids that provide them with support and protection from predators.