Miomoptera is an extinct order of insects. Although it is thought to be a common ancestor of all holometabolous insects, because no smooth transition between Miomoptera and other holometabolous insect orders is known it is considered to be in a separate order unto itself. The Miomopterans were small insects, with unspecialised chewing mandibles and short abdominal cerci. They had four wings of equal size, with a relatively simple venation, similar to that of the more primitive living holometabolous insects, such as lacewings.