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 Geomyza tripunctata
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Geomyza tripunctata
Geomyza tripunctata

Geomyza tripunctata
Geomyza tripunctata is a species in the order two-winged flies (Diptera), the suborder flies (Brachycera), the infraorder Muscomorpha (section Schizophora, subsection Acalyptrata), the superfamily Opomyzoidea, the family Opomyzidae, and the genus Geomyza. Scientific synonyms for this species are: Geomyza bracata, Geomyza calceata and Geomyza pictipennis. Geomyza tripunctata are widespread throughout the Holarctic and are one of Europe's most common Opomyzidae species.
Adults reach body lengths of up to 4 mm. Their bodies are slimly built and usually orange or black. The head of this fly is relatively broad and they have bright red compound eyes. The 3rd antennal segment is short and ovoid. The antennae are inclined downwards from the 2nd segment on. A small triangle of ocelli (simple eyes) can be seen on the upper half of the forehead. Orbital bristles reach from the front edge of the eyes to the edge of the forehead. The upper surface of the chest (thorax) is brownish-black in colour and also has bristles. The scutellum is rusty brown. The wings are transparent with a reddish-yellow sheen and have 2 diagonal veins which have several dark patches.
Geomyza tripunctata occur from the coast to high mountains and prefer wet or dry meadows and forests, where they can be found from May to November on grasses and herbaceous plants. In mild winters they may be seen in January.
After mating, the fertilized females lay their eggs at the base of grasses (Poaceae). After hatching, the maggots eat their way into and through the young sprouts and later feed on the young leaves of the grass plants. Further growth of such plants can be disrupted by this, or even prevented. The damage patterns on grass plants vary. Ragged, cracked leaves, are often seen, as are swollen stems at ground level or near the ground, or the formation of 3 to 4 stalks on the same plant. Seedlings may be cut off at the base. The maggots reach body lengths of up to 5 mm. Approximately 30 days after hatching from the eggs, the maggots have completed their development and they leave the host plants and pupate.

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Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Geomyza tripunctata
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