Amphiesmenoptera is an insect superorder, established by Willi Hennig in his revision of insect taxonomy for two sister orders: Lepidoptera and Trichoptera. Trichoptera and Lepidoptera share a number of derived characters (synapomorphies) which prove their common descent: females, rather than males, are heterogametic (for example their sex chromosomes differ); dense setae on the wings (modified into scales in Lepidoptera); a particular venation pattern on the forewings (the double-looped a… (More on Amphiesmenoptera)