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Lonchaeidae

EN · lance flies DE · Lanzenfliegen LV · melnmušu dzimta

https://en.wikipedia.org/wiki/Lonchaeidae The Lonchaeids are small flies with a black or blackish-blue body, which is often metallic, glossy, and with hyaline (lacking dark spots) wings. The head is hemispherical (shorter than high).

The larvae are mostly phytophagous, feeding on already damaged plant tissues, although coprophagous, mycophagous, saprophagous, and predatory species are known. Larvae may be found under bark, in tunnels of bark beetles, in decomposing wood and other decomposing plant residue, and in dung. Larvae of some species cause formation of galls on plants (including cereals), while larvae of other species live in juicy fruits (figs, etc.). Flies are found on trunks of trees, logs, cut wood, leaves of shrubs, and in grass. Some species are agricultural pests.