Platypezoidea

The Platypezoidea are a superfamily of true flies of the section Aschiza. Their closest living relatives are the Syrphoidea, which, for example, contain the hoverflies. Like these, the adults do not burst open their pupal cases with a ptilinum when hatching, thus the Aschiza do not have the inverted-U-shaped suture above the antennae. They are, however, muscomorphs, thus have a particular type of pupal case resembling a rounded barrel and called puparium.

Ironomyiidae is a small family of flies in the order Diptera. Historically, they had been included in the family Platypezidae, and includes three extant species within the single extant genus Ironomyia endemic to Australia and a number of extinct fossil genera from North America and Asia extending back to the Early Cretaceous.

The Opetiidae is a family of true flies of the superfamily Platypezoidea, one of two families commonly called flat-footed flies. The family contains only five extant species in two genera, Opetia from the Palearctic region and Puyehuemyia from Chile in South America. Several fossil genera have been assigned to the family, but many of these are likely to belong elsewhere in the Platypezoidea. Lonchopterites from the Early Cretaceous Lebanese amber and Electrosania from the Late Cretaceous New Jersey amber seem likely to be closely related to modern opetiids.