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Asilidae (Robber Fly)


Asilidae (Robber Fly)
Photo Information
Copyright: Ertan Ertem (hobyarli) Silver Note Writer [C: 4 W: 0 N: 43] (379)
Genre: Animals
Medium: Color
Date Taken: 2009-07-03
Categories: Insects
Exposure: f/4, 1/800 seconds
More Photo Info: [view]
Photo Version: Original Version
Theme(s): Dipterans (except Hover flies) of Europe-3 [view contributor(s)]
Date Submitted: 2010-02-27 11:07
Viewed: 3971
Points: 12
[Note Guidelines] Photographer's Note
"Adult asilids, both male and female, are noted for their rapacious attacks on other insects, incuding stinging insects such as bees and wasps. This behavior has earned them the name 'bee catchers' (Bromley 1934). They are usually found in open and sunny habitats ranging from grassland and brush, valleys and dras, to open glades in woodland. They are seldom found in deep woods where it is dark. Their flight activity occurs mainly during the hottest part of the day. The activity-threshold temperature, though undoubtedly different for each species, is telatively high; Dennis & Lavigne (1975) set it at above 20°C for most species. Their activity is greatly reduced or absent in overcast weather, as the activity of the other insects upon which they prey. Their general habit is to perch in open sunlit areas where they presumably command a good view of passing insects, then to fly out to catch a suitable prey. Some asilids take up stations on exposed branches, others on logs or stones, still other species on the ground itself, each species showing a preference for type of perch and height from the ground.

Most species capture prey as it flies by, but members of the Leptogastrinae capture stationary prey while themselves in flight, as do damselflies (Scarbrough and Sipes 1973). A few dasypoginine species capture prey that is crawling on the ground (Lavigne 1963). Immediately upon making a capture, the asilid stabs its prey with its hypopharynx in the neck between the head and thorax, at the junction of thorax and abdomen, through the eyes, or between the sclerites at the end of the abdomen (Dennis and Lavigne 1975, Scarbrough 1978). The prey is then injected with saliva containing neurotoxic and proteolytic enzymes, which rapidly immobilize the prey and liquify its tissues; in a relatively short time the asilid is able to suck out the contents."

Source information: http://www.geller-grimm.de/genera09.htm

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Critiques [Translate]

Hi Ertan,
Fantastic macro photography.
Cheers,
John.

hello Ertan
this is a SUPER macro shot
Great details and good sharpness with nice light and beautiful colours
greeting lou

Merhaba Ertan bey,

Böcekler dünyasının korkulan aktörünü, çok güzel bir av sahnesi ile görüntülemişsiniz. Zamanlama ve çekim çok başarılı. Elinize sağlık.

Saygılarımla
Mehmet.

Excellent capture of this Robberfly Ertan.
Wonderful detail and colour.
Excellent notes too.
TFS
Steve

Merhaba Ertan bey,
harika bir macro çekim olmuş tel canbazları gibi mücadele ediyorlar.
Elinize sağlık Selamlar,
Murat

Good shot with its prey.
thanks

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