Ants can be both harmful and beneficial to humans.
Classification and Origin
Ants from a single family, the Formicidae, in order Hymenoptera. They differ from other Hymenoptera in processing a pair of metapleural glands. Although the function of these thoracic glands remains unclear, it has been suggested that they produce an odor that distinguishes one colony from another.
Ants probably evolved from wasps resembling the present day family Tiphiidae. In the fossil record, ants known almost exclusively from Tertiary fossils, the oldest of which is of the Eocene Epoch (approximately 53 to 37 million years ago). These fossil ant are similar to contemporary ants.