Arthropleura
The Arthropleura resembles the millipedes that we see today. Its long body was made up of segments, and it had hard plates on its back. These extinct animals had its head tucked underneath its body, and it’s debated that it was over 2 meters long. Its parts have been found all over the world, in the U.K., Czech Republic, France, and Germany, and they lived around 345 to 290 million years ago, during the Carboniferous Period to the Permian Period. Interestingly, they’re known as the largest land invertebrates in the world, and barely had any predators. This isn’t a millipede we’d want to accidentally discover behind some boxes in our garage (Museum Wales).