As their name would suggest, millipedes generally have more legs than centipedes, and the segmental pairing of legs is pretty obvious. Millipedes are scavengers, so it s highly unlikely that one would bite if handled. Some millipedes are able to secrete small amounts of toxic chemicals like cyanide to protect themselves if threatened. Many insects have wings , which are NOT modified appendages, merely flaps of the exoskeleton of the meso- and metathoracic segments. There are about 28 to 30 orders of insects, depending on whose classification scheme you re using.
Insects exhibit one of two types of metamorphosis .
Those with gradual metamorphosis change from egg to nymph to adult. Larvae of these insects look very different from the adults, usually live in a totally different environment and eat different food. The pupa is a resting stage where much transformation takes place. These have aquatic immatures, and adults with long, narrow wings. The front wings are modified as leathery tegmina , and the hind wings are membranous.