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Diptera.info :: Identification queries :: Diptera (adults)
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male & female Hercostomus ID
Carnifex
#1 Print Post
Posted on 05-01-2018 19:06
Member

Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

Hey, caught this male indoors in January. Help with determination very much appreciated.

More pictures can be found here:
https://www.inatu...ns/9373577

Best,
Lorin
Carnifex attached the following image:


[288.12Kb]
Edited by Carnifex on 05-01-2019 20:20
 
Carnifex
#2 Print Post
Posted on 05-01-2018 19:10
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Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

.
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Igor Grichanov
#3 Print Post
Posted on 06-01-2018 17:53
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Location: St.Petersburg, Russia
Posts: 1333
Joined: 17.08.06

Hercostomus, maybe rusticus
Igor Grichanov
 
http://grichanov.aiq.ru/index.htm
Keith Short
#4 Print Post
Posted on 15-01-2018 18:48
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Location: Loves Park, Illinois, USA
Posts: 35
Joined: 10.07.12

Carnifex,

I see that you found this indoors in January. I am puzzled. Wild doli in Austria I would expect to be hibernating in the winter. Do you have a greenhouse or indoor plants where this may have emerged from the soil?

Kind regards,

Keith Short
Northern Illinois, USA
 
Carnifex
#5 Print Post
Posted on 21-01-2018 10:24
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Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

Thanks Igor, for the determination.
I would like to identify it further, if possible. Such a large genus, though... Shock


Dear Keith,

I just have normal potted plants, one of which was kept outside in the garden until late autumn.

I caught two specimens, a male and a female, within two days. Unfortunately the female escaped before I could investigate it. Was hoping for more to find, didn't happen.
Do you think the adults were overwintering or there were larvae developing in the soil?
 
Carnifex
#6 Print Post
Posted on 01-02-2018 18:14
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Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

it is not over yet: Today (Feb 1st) I caught a female, indoors again.
Carnifex attached the following image:


[88.58Kb]
 
Carnifex
#7 Print Post
Posted on 01-02-2018 18:28
Member

Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

Dear Igor,
both specimens key to species-group IV (femora black; lower postocular setae white).

I noticed that you published quite a lot about this genus, unfortunately most of the articles I have no access to. However, in the "checklist and keys to Dolichopodidae (Diptera) of the Caucasus and East
Mediterranean" both of my flies, male and female, key perfectly to H rusticus:

Male - Calypter with black cilia; Postpedicel twice as long as broad; hind basitarsus shorter than 2nd
Female - Calypter with black cilia; Postpedicel 1,5x longer than broad; hind basitarsus shorter than 2nd

I wonder if you know if there are any Middle European species that, based on these features, can be confused with H rusticus.

Best, Lorin
 
Carnifex
#8 Print Post
Posted on 01-02-2018 18:35
Member

Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

Dear Keith,

I moved the potted plant into another room, and now the flies appear there. So they might in fact come from the soil.
I found this article (in German) about phenological appearances of Dolichopodidae in Switzerland, and there have been some cases of Hercostomus rusticus in Dezember and February.

http://www.zora.u...ntHelv.pdf

Cheers!
 
Carnifex
#9 Print Post
Posted on 05-01-2019 20:23
Member

Location: Vienna, Austria
Posts: 430
Joined: 23.06.15

Hey, would like to put this thread on the agenda again :-)
Still do hope the species can be IDed to species level
Font Color
All requests are from the urban area of Vienna, if not otherwise stated.

My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated.
 
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