GIANT JAPANESE SPIDER CRAB
The giant Japanese spider crab has the biggest leg span of any other arthropod. Male spider crabs have longer leg span than the females. The claws of male specimens become longer than its legs and a large males claws, when opened, can widen to 3 metres. The width of the oval-shaped and vertically rounded shell can reach up to 30 centimetres and can be up to 40 centimetres in length. Apart from the leg span, there are numerous things in which the Japanese spider crab differs from the other crab species. It has orange body with thin legs which are covered with white spots. Their claws are usually longer than the legs and when open, they can reach to a width of about 3 meters! It has oval shaped shell and a pair of compound eyes. Young crabs bear small thorns on their shell and frontal horns, which they molt as they get older.
Average fully grown Japanese spider carb, can reach a leg span of almost 13 feet, a body size of up to 15 inches and a weight of up to 44 pounds.
Natural habitat of the Japanese spider crab is the ocean beds, especially of the Pacific Ocean. They are mostly found off the south eastern coasts of Honshu (a Japanese island), Tokyo Bay and Kagoshima Prefecture. Their noticeable population is also found off the coasts of Taiwan. Adult Japanese spider crabs can be found from deep water areas of 2000 feet to the shallow areas of 160 feet as well. But their most prominent habitat is the depth of 800 to 1000 feet. Sea goers have found eggs of the Japanese spider crabs at the depths of 300 feet, during springtime.
Japanese spider crab diet mainly consists of deep water algae, plants, mollusks, starfish, shellfishes and sometimes the animal and human carcasses.
The Japanese spider crab is believed to have a life expectancy of up to 100 years, when they are in their natural habitat. It is a particularly old species of crab and it is often referred to as a living fossil.
The Japanese spider crab predators such as octopi but...mainly Humans.
Their armored exoskeletons help protect them from larger predators such as octopi, but giant spider crabs also use camouflage. The crab's bumpy carapace blends into the rocky ocean floor. To further the illusion, a spider crab will adorn its shell with sponges and other animals. The Japanese spider crabs seems big, but it is a very vulnerable creature.
Giant Japanese spider crabs have separate sexes, similar to most of the crustaceans. Male crabs are generally larger than the females, with bigger claws. The spermatophore (a sac containing sperm) of males crabs, is transferred to the female crabs during mating, with help of their two frontal appendages. Once the fertilization is over, the female crabs carry the egg sac in their abdominal appendages. They create a cement like material to secure it to their abdomens. The newborn crabs look totally dissimilar to their parents. They bear translucent body with no legs. They molt their skin for a few times, until they get their permanent skin.
INTERESTING JAPANESE SPIDER CRAB FACTS:
The teeth of a crab are in its stomach.
The biggest crab till date was found in Maryland. It was a male and measured 9 inches.
After losing its claw, a crab can grow it back.
Crabs are also arthropods i.e. they have segmented appendages, just like cockroach, butterfly, housefly, etc.
Unlike most of the other creatures, crabs do not have separate thorax and abdomen. Rather, in most of the crabs, they are joined together and known as cephalothoraxes.
The male crabs have narrow abdomens, while the female crabs have broader abdomens.
Japanese Spider Crab can have a walking leg span of 3 to 4 m, which can go to 8 m when outstretched.
Japanese Spider Crab is the oldest crab of the world and is also believed to be the most deep-living crab as well as the one with the longest lifespan.
Hermit Crabs, King Crabs, Horseshoe Crabs and Porcelain Crabs are not true crabs. This is because they are not decapods.
Fiddler Crabs have a single large claw on one side, which they can raise in an action that looks similar to that of a person waving.
The most colorful crab in the world is probably the Sally Lightfoot Crab. It has red, orange, yellow and white colors.
The species of crab that is consumed the most in the world is the Japanese Blue Crab or the Horse Crab.
WATCH JAPANESE SPIDER CRAB ON YOUTUBE!
JAPANESE SPIDER CRAB COLORING PAGE!
BACK HOME NEXT
FISH & AQUATIC ANIMALS INDEX
BACKGROUND/GRAPHICS BY: ANIMALS M-Y-D-S