We found “strong evidence” for pain experiences in adults of two orders, Diptera (flies and mosquitoes) and Blattodea (cockroaches and termites). There was also “substantial evidence” in adult Hymenoptera (bees, wasps, ants, and sawflies), Orthoptera (crickets and grasshoppers), and Lepidoptera (butterflies and moths) […]
https://www.sciencedirect.com/science/article/abs/pii/S0065280622000170