CRAB

Crabs are a prominent group within the subphylum Crustacea, a diverse class of marine arthropods that also includes lobsters, shrimp, and krill. Characterized by a durable exoskeleton composed of chitin, crabs are well-protected against environmental challenges while supporting their internal structure. As decapod crustaceans, crabs possess ten limbs, a defining feature that contributes to their mobility, adaptability, and ecological significance across marine and coastal habitats.