Diptera.info :: Identification queries :: Diptera (adults)
Who is here? 1 guest(s)
 snail-killing fly
|
|
| Robert Heemskerk |
Posted on 07-09-2006 16:18
|
 Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
hello flyforum, I think this is a snail-killing fly. What kind of snail-killing fly is it? Is it a Coremacera sp.? place: Amsterdamse bos / Amsterdam Forest robert heemskerk Robert Heemskerk attached the following image:  [85.8Kb] |
 |
|
| Robert Heemskerk |
Posted on 07-09-2006 16:19
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
from the side
Robert Heemskerk attached the following image:  [86.57Kb] Edited by Robert Heemskerk on 07-09-2006 16:19 |
|
|
|
| Nikita Vikhrev |
Posted on 07-09-2006 16:49
|
 Member Location: Moscow, Russia Posts: 9223 Joined: 24.05.05 |
Hi Robert. I don't think it is Coremacera, 3-d antennae segment looks not hairy and wings very few spotted. I'd say Elgiva (divisa?). Nikita Nikita Vikhrev - Zool Museum of Moscow University |
|
|
|
| Robert Heemskerk |
Posted on 07-09-2006 19:13
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
Thank you for your reaction Nikita, I have searched in the Dutch sp.list and found two types of Elgiva; 1. Elgiva cucularia (Linnaeus, 1767) [soort] 2. Elgiva solicita (Harris, 1780) [soort] Then it will be Elgiva cucularia, when I have to choose.. And you have these spec. in your collection; http://www.rosfoto.ru/shop/photo/47085/  robert,
Edited by Robert Heemskerk on 07-09-2006 19:14 |
|
|
|
| Nikita Vikhrev |
Posted on 07-09-2006 20:20
|
|
Member Location: Moscow, Russia Posts: 9223 Joined: 24.05.05 |
I think you are right, Robert. I've just found on first image strong mesopleural seta which I didn't find on second image. Nikita Nikita Vikhrev - Zool Museum of Moscow University |
|
|
|
| Tony Irwin |
Posted on 07-09-2006 21:12
|
 Member Location: Norwich, England Posts: 7193 Joined: 19.11.04 |
I think this is actually Psacadina, possibly zernyi, but I often have difficulty with these species.
Tony ---------- Tony Irwin |
|
|
|
| Robert Heemskerk |
Posted on 07-09-2006 21:31
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
This fly (Psacadina zernyi) occures also in the Netherlands and it is the only Psacadina sp. according to the Dutch species list. It is not Elgiva cucularia? robert, Edited by Robert Heemskerk on 07-09-2006 21:32 |
|
|
|
| Tony Irwin |
Posted on 07-09-2006 21:51
|
|
Member Location: Norwich, England Posts: 7193 Joined: 19.11.04 |
It's not Elgiva cucularia because: the posterior cross-vein is straight, not s-shaped the costal cell (along the fore-margin of the wing) has a series of dark marks the frons is not much more produced than the mouth margin there is no mesopleural bristle! (the bristle on the first image is a notopleural) Tony ---------- Tony Irwin |
|
|
|
| Nikita Vikhrev |
Posted on 07-09-2006 22:01
|
|
Member Location: Moscow, Russia Posts: 9223 Joined: 24.05.05 |
Tony, I dare to desagree with you. I've never seen Psacadina but it has: 1. arista with long black hairs 2. no spines on apical part of hind femora (so hasn't Limnia) 3. strong mesopleural bristle isn't obligatory in Elgiva genus Nikita Nikita Vikhrev - Zool Museum of Moscow University |
|
|
|
| Jan Willem |
Posted on 07-09-2006 22:08
|
 Member Location: Waalwijk, The Netherlands Posts: 2125 Joined: 24.07.04 |
Hi, It seems to me that the scutellum has only one pair of bristles, which would mean it is not Psacadina. What about Dichetophora? Jan Willem Edited by Jan Willem on 08-09-2006 13:36 |
|
|
|
| Robert Heemskerk |
Posted on 07-09-2006 22:25
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
at least I see one black hair on the scutellum, so one pair of bristles is'nt strange at all. I didn't know there where such a different type of (this kind of) snailflies  robert Robert Heemskerk attached the following image:  [102.72Kb] Edited by Robert Heemskerk on 07-09-2006 22:25 |
|
|
|
| Nikita Vikhrev |
Posted on 07-09-2006 23:06
|
|
Member Location: Moscow, Russia Posts: 9223 Joined: 24.05.05 |
There was some non-Elgiva smell indeed... Thank you Jan, I think that Dichaetophora solve all troubles! Nikita Nikita Vikhrev - Zool Museum of Moscow University |
|
|
|
| Tony Irwin |
Posted on 07-09-2006 23:37
|
|
Member Location: Norwich, England Posts: 7193 Joined: 19.11.04 |
Good call, Jan! I'll go with Dichaetophora.
Tony ---------- Tony Irwin |
|
|
|
| Robert Heemskerk |
Posted on 07-09-2006 23:37
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
It almost solve all troubles  .., one step to go!;According to the dutch specieslist there are two species: 1. Dichetophora finlandica Verbeke, 1964 2. Dichetophora obliterata (Fabricius, 1805) Anyone who knows it, may solve it! otherwise I am very satisfied already with these nice respondings.. thanks all of you! Edited by Robert Heemskerk on 07-09-2006 23:40 |
|
|
|
| Tony Irwin |
Posted on 07-09-2006 23:44
|
|
Member Location: Norwich, England Posts: 7193 Joined: 19.11.04 |
Judging from the drawings I have infront of me, I'd say yours is obliterata. But I have a little doubt.
Tony ---------- Tony Irwin |
|
|
|
| Jan Willem |
Posted on 08-09-2006 22:17
|
|
Member Location: Waalwijk, The Netherlands Posts: 2125 Joined: 24.07.04 |
Dichetophora obliterata is known from the "Amsterdamse bos" according to Revier & Van der Goot (1989). Jan Willem |
|
|
|
| Robert Heemskerk |
Posted on 09-09-2006 13:11
|
|
Member Location: Amsterdam, Netherlands Posts: 2082 Joined: 17.10.05 |
Jan Willem and Tony, thank you very much for your help! nice to see, there are earlier seeings of this fly in this area! robert, Edited by Robert Heemskerk on 10-09-2006 20:09 |
|
|
|
| Jump to Forum: |
