Any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton.
Animal with hard shell.
One of the class of arthropods that includes crabs, lobsters, shrimps, woodlice, and barnacles. The external skeleton is made of protein and chitin hardened with lime. Each segment bears a pair of appendages that may be modified as sensory feelers (antennae), as mouthparts, or as swimming, walking, or grasping structures. + prikaži više