They contain 4 pair of walking legs attached to the cephalothorax. Many breathe through book lungs. Many of these organisms are poisonous and parasitic. Chilopoda and Diplopoda . These classes contain the centipede and millipede.
Centipedes contain one pair of walking legs per segment and are carnivorous.
The millipedes contain 2 pairs of walking legs per segment and are vegetarians. Click here for a related worksheet .