Arthroplerua

The Arthropleura was a distant relative of modern millipedes and centipedes - an arthropleurid anthropod. It grew to 2.3 metres in length, as tall as a man and as long as a car. They are also a animal that appears in the Koba files series.

Facts
Arthropleura is the biggest land arthropod known to humans. The reason why they were able to grow so big is because the oxygen level was 50% higher than it is today. The higher oxygen content in the atmosphere could support larger species whose circulatory system was not as efficient as those of mammals and other species. Arthropleura lived in the Carboniferous forests, approximately 323-299 million years ago.

Diet
Although Arthropleura's diet consisted of mostly plants, and it was possibly carnivorous as a juvenile, because they did not develop the ability to properly digest plants until they matured. Arthropleura was one of the first animals to eat plants. Although they were vegetarians, they had strong jaws and could deliver a nasty bite, but it is unlikely that they were poisonous.

Defense
Arthropleura had few if any predators, but its large size and thick armor offered substantial protection. They could also rear up tall enough to look humans right in the eye. Rearing up was a defensive reaction and they probably could spray like modern millipedes and centipedes that secrete cyanide.

Walking with Monsters
In the episode Reptile's beginnings. An Arthropleura chases a Megarachne away from its territory. Then it fights a Proterogyrinus: at first the Arthropleura uses its armored skin to protect itself from getting bitten, but Proterogyrinus pushes the giant creature over, causing the Arthropleura to get impaled by a large tree stump. The Protergyrinus then consumes the carcass by munching on its soft, exposed innards.

The Koba Files Series
The arthropleuras appear in the Carboniferous forest in herds: that are either small or big. They were often seen grazing on plants. Some even live in the Abandoned City & the Spirit Forest National Park. The parts they were found in: is places such as the City Park, the Abandoned Garden, & anywhere else that has plants. They were even big eaters. A herd of arthropleuras were captured & taken to Coast Zoo for research. In which they were placed later in a exhibit in the Small Critter house.