The largest crab in the ocean is the megalopa.

The world's largest crab is the giant mitten crab, is the largest existing kind of crustacean, it is said that the largest one found so far a giant mitten crab legs fully spread out after the length of 4.2 meters, but its body length is only 38 inside, just the legs of the extraordinarily long, the weight of 20 kilograms.

Introduction to the giant crabs

The giant crabs most commonly inhabits the continental shelf and slope of the sandy beaches and rocky bottoms, the average depth of 150-300 meters, generally in the depth of about 180 meters of water activities. During the spawning season, the crab spends most of its time in staying in shallow waters, around 50 meters. In Suruga Bay, they live in water depths of 300 meters and temperatures of about 10 degrees Celsius. Young crabs live mostly in shallower areas when temperatures rise.

The giant crabs weigh 16 to 20 kilograms and average 3 meters in length, with their chelae spread across a span of up to 4.2 meters. They are also the largest of the extant arthropods and are the largest known extant crustacean in the world. Without swimming limbs or air chambers or sacs, Gann's mitten crabs are completely incapable of swimming or floating, and can only crawl at a fast speed across the ocean floor in search of food.

They have extremely sensitive vibration-sensing organs in their bodies, which can distinguish moving objects on the surface of the sea, and the crabs are exceptionally flexible and agile in the water. The giant crabs body shape is pike-shaped, pointed at both ends, 10 crab claws both long and sharp, especially the pair of chelae like steel pincers, very strong and powerful, all the claws unfolded, can cover a range of 3 meters in diameter.

Don't look at their huge bodies, but the action is very sensitive, in front of its eyes swam through the small fish, almost no one can escape its huge pincers. To find its target, the crab lurks silently on the sea floor, using its two periscope-like eyes, as well as the vibration sensors inside its body, to distinguish objects around itself.

When it finds food nearby, it rushes there as fast as it can, and with its eight sharp claws, it wraps itself around the struggling food, and then attacks the prey with its two large, hard pincers, until the prey is bruised and exhausted and dies, and then it eats the prey.