Arthropleura is the world’s biggest ever land invertebrate. It was 0.3 to 2.6 metre(1-8.5 feet). It was related to centipedes and millipedes. It lived from 340 million to 280 million years ago. It was found North Eastern North America and Scotland. Since it was big, it did not have many predators on land.

It had a sharp and powerful set of jaws. It feed on plants. It was able move quickly on the forest floor and avoided knocking into trees and rocks. It would  moult itself in the lakes and rives and it has to be cautious of large fish and amphibians which will eat them up in the rivers or lakes.