|"Celastrina argiolus ("Lepidoptera)|
|Micropterna sequax ("Trichoptera)|
Amphiesmenoptera is an "insect "superorder, established by S. G. Kiriakoff, but often credited to "Willi Hennig in his revision of insect taxonomy for two sister orders: "Lepidoptera (butterflies and moths) and "Trichoptera (caddisflies). In 2017, a third fossil order was added to the group, the Tarachoptera.
Trichoptera and Lepidoptera share a number of derived characters ("synapomorphies) which demonstrate their common descent:
Thus these two extant orders are sisters, with Tarachoptera basal to both groups. Amphiesmenoptera probably evolved in the "Jurassic. Lepidoptera differ from the Trichoptera in several features, including wing venation, form of the scales on the wings, loss of the "cerci, loss of an "ocellus, and changes to the legs.
Amphiesmenoptera are thought to be the "sister group of Antliophora, a proposed superorder comprising "Diptera (flies), "Siphonaptera (fleas) and "Mecoptera (scorpionflies). Together, Amphiesmenoptera and Antliophora compose the group "Mecopterida.