Platypezoidea

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Panorpida
Cladus: Antliophora
Ordo: Diptera
Subordo: Brachycera
Infraordo: Muscomorpha
Sectio: Aschiza
Superfamilia: Platypezoidea
Familiae (2): Platypezidae - Opetiidae
Vernacular names
中文: 扁足蝇总科

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.
Families

Five families are placed in the Platypezoidea, listed below in taxonomic sequence:

Phoridae - coffin and scuttle flies (includes Sciadoceridae)
Opetiidae - flat-footed flies
Ironomyiidae - ironic flies[1]
Lonchopteridae - spear-winged flies, pointed-wing flies
Platypezidae - flat-footed flies

The Ironomyiidae, Lonchopteridae, and Phoridae are sometimes separated as Phoroidea. The reduced Platypezoidea thus created unites the two families of flat-footed flies.
References

McAlpine, D.K. (2008). "New extant species of ironic flies (Diptera: Ironomyiidae) with notes on ironomyiid morphology and relationships". Proceedings of the Linnean Society of New South Wales (Print). New South Wales: The Linnean Society of New South Wales. 129: 17–38.