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Genus Rhopalomyia

Gall - Midge (Fly) - Rhopalomyia californica - Rhopalomyia californica Rhopalomyia hirtipes, ventral - Rhopalomyia hirtipes - female Rhopalomyia audibertiae? - Rhopalomyia audibertiae Goldenrod rosette/bunch gall, top  - Rhopalomyia solidaginis Gall - Rhopalomyia lobata Cecidomyiidae, aster gall  - Rhopalomyia - male Cecidomyiid gall on grey rabbitbrush - Rhopalomyia Cecidomyiidae, galls before opening - Rhopalomyia
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)
Superfamily Sciaroidea (Fungus Gnats and Gall Midges)
Family Cecidomyiidae (Gall Midges and Wood Midges)
Subfamily Cecidomyiinae (Gall Midges)
Supertribe Lasiopteridi
Tribe Oligotrophini
Genus Rhopalomyia
Explanation of Names
Author: R├╝bsaamen 1892.
Numbers
Nearctica.com lists 89 species.
Arnett, p. 859, lists 86 species. (1).
Over 250 species worldwide.
Identification
Larvae white to very pale orange. Pupae usually light orange turning to dark orange or even red with age. Antennal bases of most goldenrod gall species do not develop into conspicuous horns. Abdominal segments with spicules.
Adults vary considerably in size.
Life Cycle
They induce galls in different plant parts, rhizomes, stems, leaves, flowers, etc. Some species have one generation per year, others have one fast growing generation in the spring and a slow growing one in summer.
Remarks
Most species are restricted to galls of the family Asteraceae, particularly the tribe Anthemidae, (goldenrods, 16 species).