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Diptera.info :: Family forums :: Syrphidae
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Syrphidae unknown...
Lucgast
#1 Print Post
Posted on 29-08-2014 20:08
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I would like to know which species this is
It concerns this sighting
http://scheldelan...w/87569361
identification uncertain Unidentified Fly - Diptera indet. observed at 2014-08-29 Laarne - Centrum en omgeving
Photos:
scheldeland.waarnemingen.be/fotonew/2/7313172.jpg

scheldeland.waarnemingen.be/fotonew/4/7313174.jpg

thanks in advance Luc
 
Stephane Lebrun
#2 Print Post
Posted on 29-08-2014 21:20
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It seems to be a dark Episyrphus balteatus.
Stephane.
 
ValerioW
#3 Print Post
Posted on 29-08-2014 21:29
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Stephane Lebrun wrote:
It seems to be a dark Episyrphus balteatus.



Sure it is. Female E. balteatus.
 
ValerioW
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Posted on 30-08-2014 16:37
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Just for info, there can be 3 main types of E. balteatus: the "usual" one (which is the one often seen), a "light form" (with tergites extremely poor in black stain) and the "dark form" (rich in black stain) i.e. is the case of these photos.
 
Lucgast
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Posted on 31-08-2014 05:53
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Thanks, very interesting and first time I see a different one.
Are these dark versions rare?
Luc
 
Stephane Lebrun
#6 Print Post
Posted on 31-08-2014 07:29
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The colouration depends of the temperature during pupal stage. Warm temperatures make lighter coloured forms, cold temperatures make darker coloured forms. Darker forms better retain the heat.
Edited by Stephane Lebrun on 31-08-2014 07:41
Stephane.
 
ValerioW
#7 Print Post
Posted on 31-08-2014 11:46
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Lucgast wrote:
Thanks, very interesting and first time I see a different one.
Are these dark versions rare?
Luc



Here, in Italy, I've never seen one (and consider that in my experience E. balteatus is the most abundant hoverfly). But I know about them from North European papers, and this easily confirms Stephane's speech.
 
Stephane Lebrun
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Posted on 31-08-2014 12:19
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Come in North of France, you'll see ones ! August was just as warm as October.awkward
Stephane.
 
christoophe
#9 Print Post
Posted on 31-08-2014 12:21
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Here is an extreme example photographed in December in the south of France.
christoophe attached the following image:


[190.07Kb]
Edited by christoophe on 31-08-2014 12:22
 
ValerioW
#10 Print Post
Posted on 31-08-2014 14:02
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christoophe wrote:
Here is an extreme example photographed in December in the south of France.



Incredible. It's near full melanic In pictures I've seen they're never so dark. South France should be somehow similar with its climate to North-East Italy. This autumn/winter I've to try to find some.
 
Paul Beuk
#11 Print Post
Posted on 02-09-2014 10:09
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They all look like intersexes: most markings obscured, frons narrower than in regular females and no distinct genitalia.
Paul

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Paul Beuk on https://diptera.info
 
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