Hymenopterida

Hymenopterida is a superorder of holometabolous (metamorphosing) insects. As originally circumscribed, it included Hymenoptera and the orders in Panorpida (Mecoptera, Siphonaptera, Diptera, Trichoptera and Lepidoptera). However, more recent studies find Hympenoptera as sister to the other members of Holometabola and the superorder is restricted to Hymenoptera.

Evolution
The following phylogenetic tree shows the internal relationships of the superorder as a clade of Hymenoptera and the orders that comprise Panorpida.

More recent molecular analyses find a different arrangement within Holometabola, with Hymenoptera as the earliest branching group.