Arthropleura armata

Arthropleura was a giant relative of centipedes and millipedes that lived in Great Britain and North America during the Carboniferous period. It is the largest known land invertebrate of all time, and grew so large because of the high concentration of oxygen in Carboniferous Earth's atmosphere.

Characteristics
The body of the Arthopleura was composed of thirty armoured plates, which each had a pair of legs under them, and its body was about six metres long.

Real life
Arthropleura (name meaning "Jointed Ribs") was an arthropod genus and ancestor of modern day centipedes and millipedes, and one of the largest known land invertebrates of all time. It lived from 323 to 299 million years ago, during the upper Carboniferous period, in what is now Scotland and northeast North America. Arthropleura is thought to have been a herbivore, and it could move and swerve very quickly among its habitat's forest floor and around obstacles.

Due to the Carboniferous atmosphere's higher oxygen concentration and Arthropleura's lack of predators, it was able to grow larger than modern arthropods, being between 0.3 and 2.6 metres (1 and 8.5 feet) long. Arthropleura died out at the end of the Carboniferous period due to destruction of the Carboniferous rainforests to desertification and arid climate.

Trivia

 * Some fans also believe that these Millipedes were Eoarthropleura, the Silurian ancestors of Arthropleura.
 * Arthropleura was the first venomous creature in Primeval.
 * A few fans have speculated that the Arthropleurid species seen in Primeval may not have been Arthropleura at all; due to the fact that Connor referred to the creature just as an Arthropleurid, and due to the differences between the Primeval Arthropleura and the real-life version.

Errors

 * Arthropleura was not believed to be venomous by any means, since it presumably had no enemies and ate dead plant matter.