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Infraorder Bibionomorpha - Gnats, Gall Midges, and March Flies

March Flies - Bibio slossonae - male - female Plecia - Plecia nearctica Sausage Worm - Bibio gall on quaking aspen laef - Harmandiola Aphid unknown Fungus gnat? march fly - Bibio
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Nematocera" (Non-Brachycera))
Infraorder Bibionomorpha (Gnats, Gall Midges, and March Flies)
Habitat
Generally terrestrial, in contrast to other Nematocera which are predominantly aquatic.
Remarks
Probably not a monophyletic assemblage. Ordered this way for convenience, based on the Tree of Life.

Most of the species, genera, and families belong to superfamily Sciaroidea, the fungus gnats and gall midges, which probably is monophyletic.
Internet References