The Phylum Arthrodopa includes the Class Insecta. Other non-insect classes include spiders, scorpions, whipscorpions, harvestmen, ticks, mites, sea spiders, crustaceans, millipedes, centipedes, pauropods and symphylans.
Diplopoda in Greek means two legs. Millipedes possess two pair of short legs per visible body segment. They are characteristically slow movers and are usually found in damp leaf litter, rotting wood or soil. As part of their defensive behavior, they roll up in a ball to protect their softer underside surface and exudes protective hydrogen cyanide fluid from its sides when disturbed. This Indonesian millipede displays a classic yellow and black warning coloration advertising the chemical line of defense it will unleash if disturbed.