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This illustration shows a crab, a species of cancer. Crabs are decapod crustaceans with thick exoskeletons.

Crab

This illustration shows a crab, a species of cancer. Crabs are decapod crustaceans with thick exoskeletons.

"The fiddler-crab has one large claw and one small one; the large claw is held in such a manner as to suggest a violin, and the small one in such a position as to represent the bow."

Fiddler-crab

"The fiddler-crab has one large claw and one small one; the large claw is held in such a manner as to…

A common shrimp, a genus of the decapod Crustacea.

Shrimp

A common shrimp, a genus of the decapod Crustacea.