Japanese Spider Crab
Hail Crabzilla! The Japanese Spider Crab is the biggest arthropod on Earth–their legs are believed to grow up to 12 feet long. But since they live at such great depths (typically 1,000 feet down or so) a full grown spider crab has yet to be caught. So for now, we’ll have to make due with the 5 foot long Crabzilla (that’s what it’s called–I didn’t make it up!), one of the largest known crabs in the planet.