Thread subject: Diptera.info :: Dolichopodidae to identify
Posted by Rui Andrade on 11-09-2009 23:15
#1
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
Posted by Igor Grichanov on 12-09-2009 08:58
#2
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 09:13
Posted by Stefan Naglis on 12-09-2009 09:31
#3
I think this is a Gymnopternus sp. Hercostomus gracilis has a conspicuous swollen costa.
Posted by Igor Grichanov on 12-09-2009 16:21
#4
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.
Posted by Rui Andrade on 12-09-2009 23:40
#5
Thank you both very much. I’ll try later to show you better photos of the wing.
Posted by Marc Pollet on 13-09-2009 10:04
#6
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
Posted by jorgemotalmeida on 13-09-2009 10:48
#7
A strange name for a dolichopodidae.
This fly was known for Spain, but this is the first record for Portugal.
Posted by Igor Grichanov on 13-09-2009 11:55
#8
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 11:57
Posted by Stefan Naglis on 13-09-2009 12:06
#9
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).
Posted by Rui Andrade on 13-09-2009 19:22
#10
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.
