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Common cluster fly - Pollenia rudis
Common cluster fly - Pollenia rudis

Common cluster fly
The common cluster fly (Pollenia Rudis), also known simply as the cluster fly, belongs to the order (Diptera), suborder Brachycera, infraorder Muscomorpha (Sub-Department: Calyptratae) the superfamily Oestroidea and to the family blowflies (Calliphoridae). It is of the subfamily Polleniinae and the genus Pollenia. This species is common and widespread in Europe, North America, North Africa and Asia. It reproduces 3-4 times a year and is non-dangered.
Pollenia rudis - Side view
Pollenia rudis - Side view
The common cluster fly is medium-sized, reaching body lengths of 4.5 to 12 mm. Its body is brownish-black. Its head is whitish-grey and it has a dark marking covered with black bristles in the middle of its face. The eyes, which are on top of the head and nearly touch, are compound, large, oval and reddish-brown in colour.
Common cluster fly - Top view
Common cluster fly - Top view
The chest section (thorax) has a dark greyish-green sheen, and is covered (especially in the case of the females) in thick, wavy, golden brown hair, growing backwards. These hairs thin out over time and then 4 dark lines appear lengthwise. The males have thicker hair at the sides. At the edges of the scutellum are 6-8 long, black bristles. The abdomen is olive coloured with some light patches. The wings, span 12-16 mm, shimmer brownish, have black veins and overlap on the abdomen in resting position. The common cluster fly is cumbersome in flight.
Blowfly - Pollenia rudis
Blowfly - Pollenia rudis
Adult flies have a life expectancy of approximately 1 year, are diurnal and prefer habitats such as grasslands, wetlands, fields, forests, large lawns, golf areas and other sports facilities, cemeteries, housing estates, stables and pavements. They appear throughout the year. From spring to summer, they are found on blooming coltsfoot (Tussilago farfara), daisies (Bellis perennis) and common hogweed (Heracleum sphondylium), where they feed on nectar and pollen.
Common cluster fly with a drop in the mouth
Common cluster fly with a drop in the mouth
It overwinters as an adult without food and without reproducing. These fliessearch for small cavities in attics and storage areas in human settlements to overwinter, often in droves. They wake up on warm sunny days or when the heating is turned on and are then guided to the light. In early spring, they appear, often en masse, in skylights or on the window panes of barns and sheds.

Description of images / photos
Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Common cluster fly - Pollenia rudis
2. Pollenia rudis - Side view
3. Common cluster fly - Top view
4. Blowfly - Pollenia rudis
5. Common cluster fly with a drop in the mouth
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