Diptera.info :: Identification queries :: Diptera (adults)
 Tachinidae (canaries) -> Gonia ornata/quadrisetosa
|
|
| Michael Becker |
Posted on 16-12-2009 16:51
|
|
Member Location: Germany, Neuss Posts: 1268 Joined: 16.01.07 |
Hello, this 7mm fly is from april from the mount Teide on Tenerife (canary islands) from about 2500m. Does anyone have an idea, what it could be? Thanks, Michael Michael Becker attached the following image:  [55.69Kb] Edited by Michael Becker on 16-12-2009 21:38 |
|
|
|
| Roger Thomason |
Posted on 16-12-2009 17:06
|
 Member Location: Mossbank,Shetland Isles. Posts: 5268 Joined: 17.07.08 |
Gonia |
|
|
|
| Zeegers |
Posted on 16-12-2009 17:50
|
|
Member Location: Soest, NL Posts: 19028 Joined: 21.07.04 |
looks like ornata. Some people consider it on the Canary a separata species: quadrisetosa. I'm not convinced. Theo |
|
|
|
| Michael Becker |
Posted on 16-12-2009 21:37
|
|
Member Location: Germany, Neuss Posts: 1268 Joined: 16.01.07 |
Hello Roger, hello Theo, thank you for your answers. I looked up the genus Gonia in the Fauna Europaea, and there were four species: G. atra which seems to be different, G. quadrisetosa - thank you Theo for your explanation -, G. bimaculata, which seems to be lighter brown, if I look in the internet, and G. umbripennis, obviously an endemic or african species, of which I don't know anything. So it seems rather sure, that it is G. ornata/quadrisetosa. Greetings, Michael |
|
|
|
| Zeegers |
Posted on 16-12-2009 21:53
|
|
Member Location: Soest, NL Posts: 19028 Joined: 21.07.04 |
Yes, it is rather sure. Theo |
|
|
|
| Michael Becker |
Posted on 17-12-2009 05:58
|
|
Member Location: Germany, Neuss Posts: 1268 Joined: 16.01.07 |
Thank you again! Michael |
|
|
|
| Jaakko |
Posted on 17-12-2009 12:33
|
 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Quite dark for an ornata, at least when compared to the specimens here in north.. |
|
|
|
| Zeegers |
Posted on 17-12-2009 13:39
|
|
Member Location: Soest, NL Posts: 19028 Joined: 21.07.04 |
Well, yes and no. About 5 % of the ornata are completely black. These can mostly be found in the drawer under 'picea' So the fact that you don't see such dark specimens, raises the question if they are really not there, or you have IDed them as picea ? But I agree, compared with a typical ornata this one is dark. This is a common feature of Tachinidae from the Canary Isles and Madeira as well: for instance Nemorilla maculosa and Pales exsulans Theo |
|
|
|
| Jaakko |
Posted on 18-12-2009 12:45
|
|
Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Thanks for the pointer! The G. divisa around here are mainly black. I haven't really collected many ornata/picea, as they are all fairly common around here. The facial measures should be characteristic (and obvious when comparing), also the pollinosity on the face is different (golden/dirty in ornata, clean silver in picea), but I don't know if this is a stable feature. |
|
|
|
| Zeegers |
Posted on 18-12-2009 16:52
|
|
Member Location: Soest, NL Posts: 19028 Joined: 21.07.04 |
I did sent some of the black divisa to Ziegler, they surprised me as well. We'll have to wait for his comment, and since he is working on other projects at the moment, this will take time. the proportions of the face are - indeed - distinctive. However, be very sure to compare males with males only, females with females only !! Otherwise you will find to undescribed species of Gonia Gonia masculina and Gonia feminina ! Theo |
|
|
|
| Jump to Forum: |