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 Scatella paludum?
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| Nikita Vikhrev |
Posted on 07-07-2006 19:18
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 Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
Moscow region, 06 july, 2-2,5mm After finishing ID I disovered new Nigel's thread with same fly. According Tony's explanations: silvery face brown dusting restricted to the dorsal surface of tergites white spots on the wings sometimes almost invisible Unfortunely I don't know what is"genal bristle". Nikita Vikhrev attached the following image:  [77.24Kb] Nikita Vikhrev - Zool Museum of Moscow University |
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| Tony Irwin |
Posted on 07-07-2006 21:40
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 Member Location: Norwich, England Posts: 7236 Joined: 19.11.04 |
Hi Nikita Yes, this is paludum (the upper one is a female, the lower one a male). The genal bristle is located almost directly under the eye. It's the lowest of the series of bristles running down the sides of the face. Your specimens clearly have a weak genal bristle. Tony Tony ---------- Tony Irwin |
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| Nikita Vikhrev |
Posted on 08-07-2006 13:22
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Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
Thank you Tony. Once again I discovered the main (for me) problem with ID flies on photo. Both images above have been made in same cow's footstep with 100ml of water. I remembered Ephydridas with darkened wings with white spots. Two my grate astonishment under micriscip I found only 1 out of 4 Ephydridae witu such wings. Another 3 looks with clear wings. Going by key I found that 3 is same as on photo, that wings are dark with white spots, but less visible. Another one is with brown face and good visible genal bristle (thanks once more) pointed foreward and down. I think it is S. stagnalis. Nikita Nikita Vikhrev - Zool Museum of Moscow University |
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| Nikita Vikhrev |
Posted on 08-07-2006 19:44
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Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
One more question. Please, Tony, how did you distinguish sexes in Scatella? Nikita Vikhrev - Zool Museum of Moscow University |
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| Tony Irwin |
Posted on 08-07-2006 23:21
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Member Location: Norwich, England Posts: 7236 Joined: 19.11.04 |
In most Ephydridae, the male has a large pre-genital tergite that encloses the hypopygium. Looking at your lower photograph, the joint tergite 1+2 appears just behind the haltere, then tergites 3 and 4, then the large fifth tergite. In the female (top photo) a sixth tergite is visible. In many species of Scatella there are secondary sexual characters (swollen costa or longer bristles behind the fore-femora), but the sexes in paludum are very similar. Tony Tony ---------- Tony Irwin |
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| Nikita Vikhrev |
Posted on 08-07-2006 23:32
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Member Location: Moscow, Russia Posts: 9349 Joined: 24.05.05 |
Understood. Thank you Tony. Nikita Vikhrev - Zool Museum of Moscow University |
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