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Family Dixidae - Meniscus Midges

Dixidae?? - Dixella dorsalis Nematocera Midge? Winter Crane Fly? - Dixella nova - female Seep dweller - Dixa Meniscus Midge from McLaren Park in SF, CA Meniscus Midge from McLaren Park in SF, CA Dixidae!  Dixella male? - Dixella californica - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Nematocera" (Non-Brachycera))
Infraorder Culicomorpha (Mosquitoes and Midges)
Family Dixidae (Meniscus Midges)
Explanation of Names
Dixidae Schiner 1868
Numbers
42 spp. in 3 genera in our area(1), ~200 spp. in 9 genera total(2)
Size
body 4-8 mm
Identification
Adult: body yellowish to dark brown; wings without scales, with sparse hairs, R2+3 strongly arched; antennae with sparse hairs; proboscis short; Sc complete; ocelli absent
Larva: aquatic, eucephalic, with several distinctive features (crowns, combs, terminal complex) widely used in identification of species groups; individuals rest in characteristic U-shaped position at water meniscus
Range
all continents except Antarctica(3); in our area, mostly northern; species are not widespread(1)
Habitat
adults are poor fliers and can be found near larval habitat resting on emergent or overhanging vegetation; larvae lie in the meniscus or crawl out of the water on rocks, moss, or emergent vegetation(3); Dixella larvae live in stagnant water; Dixa prefer running waters
Food
adults do not feed; larvae are filter feeders(3)