We can definitely learn a thing or two! For gills to work, they must be able to take in oxygen and transport it into the animal's bloodstream. Belonging to the subphylum Crustacea, crabs have well-developed brains. Area of the square is side x sidei.e., a x a=a2Therefore, TSA of the cube=6 x area of one side.TSA=6a2. Sushi ii: A Ho-Hum Omakase Experience | Exploration: Hawaii, The Snackdown review: McDonald's Ebi Burger & White Choc Strawberry Cream Pie. Do they have a cluster of nerves sophisticated enough to be considered a brain? If all that stuff in the crab really was brains, crabs would have to have the largest brain to body size ratio in the world… as far as I know humans hold that honour and crustations, well lets just say they ain’t that smart. First time i tried it, here in Sydney i haaaaated it. When shore crabs (Hemigrapsus sanguineus) have formalin injected into the cheliped (claw), this evokes specific nociceptive behavior and neurochemical responses in the thoracic ganglia and the brain.