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Infraorder Bibionomorpha - Gnats, Gall Midges, and March Flies

Gall - Contarinia Galls on ashleaf maple (Acer negundo) - Contarinia undescribed-species-on-boxelder stem gall - Neolasioptera boehmeriae Willow Pinecone Gall Midge - Rabdophaga strobiloides Gall Midge on Blackberry  - Neolasioptera farinosa Gnat - Leia opima Gall Midge Sciarid - male
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