Diptera.info :: Identification queries :: Diptera (adults)
 Dolichopodidae to identify
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| Rui Andrade |
Posted on 11-09-2009 22:15
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 Member Location: Portugal Posts: 3123 Joined: 19.06.07 |
I found this dolichopodid with beautiful eyes on the estuary of Douro river. Is it possible to get an identification? location: Vila Nova de Gaia, Portugal date: 11/09/2009    And a video: YouTube Video |
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| Igor Grichanov |
Posted on 12-09-2009 07:58
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 Member Location: St.Petersburg, Russia Posts: 1783 Joined: 17.08.06 |
Close to Hercostomus gracilis (Stannius, 1831) (=Hercostomus bicolor Schiner, Parent & alii auctt. see Collin, 1940: Ent.monthlyMag. 76 [= ser.4, vol.1]: 264) (nec Macquart, 1827) *
Edited by Igor Grichanov on 12-09-2009 08:13 Igor Grichanov |
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| Stefan Naglis |
Posted on 12-09-2009 08:31
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
I think this is a Gymnopternus sp. Hercostomus gracilis has a conspicuous swollen costa. |
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| Igor Grichanov |
Posted on 12-09-2009 15:21
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Member Location: St.Petersburg, Russia Posts: 1783 Joined: 17.08.06 |
Sorry, Stefan. I do not remember any Mediterranean Gymnopternus with light postoculars and light cilia on calypters. BTW I am not sure that this is a gracilis, as swollen costa behind R and curvation of M are poorly visible on this projection.
Igor Grichanov |
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| Rui Andrade |
Posted on 12-09-2009 22:40
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Member Location: Portugal Posts: 3123 Joined: 19.06.07 |
Thank you both very much. I’ll try later to show you better photos of the wing. |
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| Marc Pollet |
Posted on 13-09-2009 09:04
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Member Location: Welle (Denderleeuw) Posts: 161 Joined: 02.06.05 |
Prezado Rui, Sorry that I checked this website so late, but what you have photographed is clearly a male of Muscidideicus praetextatus, an exclusive European monospecific dolichopodine genus. This species is usually quite uncommon, but where is occurs, it might be found in numbers. It's confined to saltmarshes and the adjacent humid sandy sites. I am happy to help with any question concerning Palaearctic and New World dolichodids. Um abraço, Marc Dr Marc Pollet |
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| jorgemotalmeida |
Posted on 13-09-2009 09:48
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
A strange name for a dolichopodidae. This fly was known for Spain, but this is the first record for Portugal. |
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| Igor Grichanov |
Posted on 13-09-2009 10:55
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Member Location: St.Petersburg, Russia Posts: 1783 Joined: 17.08.06 |
I agree with Dr Marc Pollet. Many years ago I saw once a museum specimen with Abdomen aplati dorsalement à la manière des Muscides (Parent 1938). I see here normal cylindric abdomen. So, only small additional 7th dorsocentral seta separates Muscidideicus from Hercostomus?
Edited by Igor Grichanov on 13-09-2009 10:57 Igor Grichanov |
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| Stefan Naglis |
Posted on 13-09-2009 11:06
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Member Location: Switzerland Posts: 738 Joined: 27.12.08 |
An additional useful character for Muscidideicus are the long setae on the hind femur which are almost as long as the preapical setae (well visible on the first picture). |
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| Rui Andrade |
Posted on 13-09-2009 18:22
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Member Location: Portugal Posts: 3123 Joined: 19.06.07 |
Dear Marc, thank you for the identification of this fly! I've seen a few of them in the same spot. If anyone is interested in some specimens, I could try to collect them. |
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