crustacean; any of various aquatic arthropods having a body covered with a hard shell, such as crabs, lobsters, or shrimp

Any of a large group of arthropods, typically with a hard shell and two pairs of antennae, such as shrimp and crabs

chitin; a fibrous substance consisting of polysaccharides that forms the major constituent in the exoskeleton of arthropods

beetle; any insect with hard wing covers that protect the wings used for flying

insects belonging to the order Coleoptera