Which aquatic animal listed possesses jointed legs and a hard shell, classifying it strictly as a crustacean?
Answer
Lobster
Crustaceans are defined by possessing jointed legs and a hard shell, lacking a backbone. Among the common seafood types, lobster fits this description perfectly, alongside shrimp, prawns, crab, and crayfish. Clams, squid, and oysters, conversely, belong to the mollusk category, which is a separate subdivision within the broader shellfish classification. Distinguishing between crustaceans and mollusks is important because crustaceans are often responsible for the most frequent types of allergic reactions.
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