Mazothairos

As the largest representative of Palaeodictyoptera, it is believed to have had specialized sucking mouthparts, used to pierce plant tissues and drink their liquids, similarly to some of its relatives. It is also sometimes assumed to have had a pair of winglets on the prothorax in front of its first pair of wings (which give its order the epithet of "six-winged insects"), but the very fragmentary nature of its holotype specimen makes their presence difficult to verify.

Mazothairos lived in the Mazon Creek fossil beds in modern-day Illinois, a lagerstätte formed approximately 309 million years ago during the Pennsylvanian epoch of the Carboniferous period, which is thought to have been a part of a river delta system and have had a tropical climate.