You probably don’t think of a lobster as anything like an insect . . . especially when you’re eating it. But lobsters and insects are very similar in structure:
Both have hard skeletons covering and protecting their soft bodies; both have many legs with movable joints; both have bodies divided into segments; both have antennae; and both have similar blood, digestive, and reproductive systems.
And while insects are the most numerous creatures on land, lobsters and their relatives (crabs and shrimp) are the most common creatures in the sea.