What is the world's largest type of crustacean?

The world's largest type of crustacean is the Japanese spider crab (Macrocheira kaempferi). These crabs can weigh up to 44 pounds and have a leg span of up to 12 feet from claw to claw. They are found in the waters around Japan, and are a popular food item in Japanese cuisine.

Despite their large size, Japanese spider crabs are relatively harmless to humans. They are mostly scavengers and feed on dead animals and plants. They have a hard exoskeleton that protects them from predators, and they can also use their sharp claws to defend themselves.

However, despite their impressive size, Japanese spider crabs are considered a vulnerable species due to overfishing and habitat destruction. They are protected by law in Japan, and efforts are being made to conserve their populations.

The world's largest type of crustacean is the Japanese spider crab. It can grow up to 12.5 feet (3.8 meters) from claw to claw, making it one of the largest arthropods in the world. The Japanese spider crab is found in the waters around Japan and can live up to 100 years. It is a scavenger and eats a variety of things, including seaweed, shellfish, and other crabs. The Japanese spider crab is not considered a threat to humans, but it can be dangerous if provoked.