The term parasitoid wasp refers to a large evolutionary grade of hymenopteran superfamilies, mainly in the Apocrita. The parasitic or parasitoidal Apocrita are divided into some dozens of families. They are parasitoids of various animals, mainly other arthropods. Many of them are considered beneficial to humans because they control populations of agricultural pests. Others are unwelcome because they are hyperparasitoids, attacking beneficial parasitoids.