12 Weird and Wonderful Deep Sea Monsters

6. The Colossal Japanese Spider Crab: A Giant of the Ocean Floor

The Japanese Spider Crab (Macrocheira kaempferi) is a massive crustacean and the largest arthropod known, boasting a leg span of up to 12 feet (3.7 meters). Dwelling in Japanese waters at depths of 150 to 800 meters, this incredible creature thrives in the cold, high-pressure depths of the ocean. Its long, slender legs help it navigate the seafloor with ease while blending into its environment for protection.
Though their appearance may seem terrifying, Japanese Spider Crabs are mostly scavengers, dining on dead fish, algae, and small crustaceans. Their powerful claws can break mollusk shells with ease. Fascinatingly, these crabs practice "decorating behavior," attaching sponges and algae to their shells for extra camouflage and defense against predators. Living up to 100 years, these crabs grow slowly, molting throughout their lives. Females may carry up to 1.5 million eggs, though few reach maturity. Due to their slow growth and long lifespan, conservation is vital, as overfishing and habitat loss threaten their survival. The Japanese Spider Crab is a stunning example of the ocean floor's extraordinary adaptations.

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