Japanese Spider Crab
Weirdness 8/10

The largest arthropod on Earth, with a thirteen-foot leg span

The largest arthropod alive can span nearly thirteen feet from leg to leg — wider than a car.

📋 Fact File
🐾 Crustacean🍽️ Omnivore (seafloor scavenger)
📏 Size
Body about 37 cm (15 in) across; legs span up to 3.7 m (12 ft)
Leg tip to leg tip, it is wider than a car
Lifespan
Up to about 100 years (scientists' best estimate)
Not EvaluatedNot on the Red List, but catches have fallen for decades, so Japan bans fishing during its breeding season.
🤔 Guess first

Which one is REALLY true about the Japanese Spider Crab?

The short version

The Japanese spider crab lives in cold deep waters off Japan, spans nearly thirteen feet from leg tip to leg tip yet has a body the size of a basketball, is a gentle scavenger, can regrow lost legs, and may live up to a hundred years.

Why it's so weird

  • The Japanese Spider Crab is the largest arthropod on the planet.
  • The Japanese Spider Crab can span nearly thirteen feet from the tip of one leg to the other, wider than a car.
  • The Japanese Spider Crab has a body only about the size of a basketball, even with that enormous leg span.
  • The Japanese Spider Crab walks slowly across the seabed on eight impossibly long, spindly legs, scavenging dead animals, shellfish and scraps.
  • The Japanese Spider Crab can lost legs, and some individuals are thought to live for as long as a hundred years.
📏 How big is it, really?
Japanese Spider Crab
37 cm
Japanese Spider Crab
a 7-year-old
1.2 m
🧒

You could line up about 3 of them along a 7-year-old!