Arthropleura

Arthropleura was a giant species of milliipede, that lived during the Carboniferous Period, around 300 million years ago.

Description
Arthropleura reached up to three metres long, a monster size for a millipede. Oxygen levels were higher then, and that is why Arthropleura and other insects could grow so big.

There have never been any complete fossils of Arthropleura found, just fragments and trackways, which show that the creature was enormous.

Popular Culture
Arthropleura appeared in the fifth episode of Prehistoric Park, when Nigel Marven travelled to the Carboniferous. The Arthropleura was the last creature he brought back in that episode, and he only just saved it from a forest fire.

Arthropleura reappeared in the second episode of Primeval. One came through the anomaly, along with lots of Giant Spiders, and it poisoned Stephen Hart. The producers of Primeval increased the length to six metres.