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Dixidae

Dixidae Temporal range: Early Jurassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Dixa nebulosa
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Diptera
Superfamily:	Culicoidea
Family:	Dixidae Schiffner, 1868
Genera
Asiodixa Papp, 2006[1] Dixa Meigen, 1818 Dixella Dyar & Shannon, 1924 Meringodixa Nowell, 1951 Mesodixa Metadixa Neodixa Nothodixa

The Dixidae (meniscus midges) are a familyofaquatic nematoceran flies (Diptera). The larvae live in unpolluted, standing fresh waters, just beneath the surface film, usually amongst marginal aquatic vegetation.^[2][3] They are found in all continents except Antarctica.

For terms see Morphology of Diptera

Dixidae are small (body length not more than 5.0 mm) slender gnats with thin legs. Adults are black to yellowish-brown.^[4] The head is relatively broad. The antennae are thin and the flagellum has 14 segments. The proboscis is short and thick and the palpi are five-segmented. The thorax is slightly convex. The wing veins are without scales (with scales in the closely related family Culicidae. The subcosta is fused with the costa at the level of the base of Rs or slightly proximal to this. The wing venation exhibits radial, medial, and cubital forks (R 4 branched, M 2 branched, Cu 2 branched). R 2+ 3 is strongly arched, the r–m crossvein is distinct, and the discal cell is absent. The anal vein of the wing is long. The genitalia of the male is inverted at 180° by torsion of segments 5–8.

The oldest known fossils of the group come from the Jurassic of Asia, assigned to the extinct genera Syndixa and Eucorethrina, members of modern genera are not known until the Eocene.^[5]

• Lindner , E 193 1. Dixinae (Culicidae) 3, 11–12, 1-43 In: Lindner, E. (Ed.). Die Fliegen der Paläarktischen Region Keys to Palaearctic species but now needs revision (in German).
• A. A. Shtakel'berg Family Dixidae in Bei-Bienko, G. Ya, 1988 Keys to the insects of the European Part of the USSR Volume 5 (Diptera) Part 2 English edition.Keys to Palaearctic species but now needs revision .

Wikispecies has information related to Dixidae.

• Delta Int Key – family description and image
• BugGuide
• Wing venation
• EOL images
• Diptera.info images
• Dixiidae in Italian

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