the crab with the shells

abdomen animal animals blue brachyura brown callinectes carapace cephalothorax claw claws coast colour colourful colours confused crab crabs creamy crustacean crustaceans eye eyes frutti hermit leg legs mare marine maxilla natural naturalist naturalists nature people pincer pincers sand sapidus sea shell shells swimmerets the thoracic tint tints water wildlife without