Number;"Autapomorphic characters of Amphiesmenoptera"
1;"Prelabium fused with hypopharynx, forming eversible haustellum"
2;"Anal veins of forewings fused, forming one or two basal loops"
3;"Lower posterior corner of laterocervicale produced towards prosternum"
4;"Pterothoracic episterna with characteristic suture pattern"
5;"Wing membrane with extensive covering of setae and/or scales"
6;"Presence of paired gland openings on sternum V"
7;"Male abdominal segment IX with tergum and sternum fused, forming a closed ring"
8;"Campaniform sensilla on apical ends of radial, median, and cubital veins"