Kristensen provided a summary of 21 apomorphies supporting the monophyletic
group of Amphiesmenoptera, with both Trichoptera and Lepidoptera certain
features (e.g. forewing the terminal of the anal vein fusion. Furthermore, the
monophylies of Trichoptera and Lepidoptera are also generally accepted
Insect fossil caddisflies are generally preserved incompletely or indistinctly, and
often only forewing is visible on the fossil