Hemimetabolism or hemimetaboly, also called incomplete metamorphosis, is a term used to describe the mode of development of certain insects that includes three distinct stages: the egg, nymph, and the adult stage, or imago. These groups go through gradual changes; there's no pupal stage. The nymph often resemble the adult somewhat, as they've compound eyes, developed legs and wing stubs visible on the outside. Examples of hemimetabolous insects Hemiptera (scale insects, aphids, whitefly, cicadas… (More on Hemimetabolism)