The name of the Carboniferous comes from the fact that in the soils formed in this period are many widespread deposits of coal, in consequence of the great development of forests occurred in this period. Among the invertebrates, Arthropleura, in particular, was a kind of giant centipedes, while Meganeura was a prehistoric insect that resembled very much a dragonfly, but its size was gigantic with a wingspan of over 75 cm, the Meganeura is one of the largest insects ever appeared on Earth.