👉 Crustoderma is a type of crustacean found primarily in freshwater habitats, typically living on the surface of bodies of water or on rocks and sand. They have a hard, protective shell that they use to protect their delicate tentacles from predators and to provide protection against parasites. Crustoderms are characterized by their long, slender bodies, which often resemble those of fish, and their large eyes, which they use to detect prey or predators in the water.