They are certainly not alone in their quest for camouflage using external sources, with a number of other crustaceans using seaweed and shells (think hermit crabs) to mask their identity on the sea floor. Sponge Crabs . There is no daily possession limit for blue crabs, but its legal size must be a minimum of 5 inches, measuring across the body from one tip of its spine to the other. It was first seen off Egyptian waters in the 1940s, but reports of blue crab sightings in Italy, Israel, Greece, and Turkey have been made, too. Genus: Lauridromia Only its mandibles move as it picks away at a smaller, deceased crab. CHANCES ARE YOU’VE NEVER spotted a sponge crab, but if you had, you wouldn’t be forgetting their wacky appearance any time soon. They have a very ungainly walk and have a grumpy look about them. The size of the sponge varies greatly and some crabs appear to be better than others at trimming the sponge to fit them. 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