Definition
A crustacean is a type of arthropod that primarily lives in aquatic environments and has a hard exoskeleton, segmented body, and jointed appendages. π¦π¦ Think of crabs, lobsters, shrimp, and barnacles! These creatures are found in oceans, rivers, and even some terrestrial habitats. They play important roles in marine ecosystems. Crustaceans vary greatly in size and shape. They are a major food source for many animals, including humans.