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 Syrphidae unknown...
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| Lucgast |
Posted on 29-08-2014 20:08
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Member Location: Posts: 163 Joined: 12.11.12 |
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:   thanks in advance Luc |
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| Stephane Lebrun |
Posted on 29-08-2014 21:20
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 Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
It seems to be a dark Episyrphus balteatus.
Stephane. |
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| ValerioW |
Posted on 29-08-2014 21:29
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 Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
Stephane Lebrun wrote: It seems to be a dark Episyrphus balteatus. Sure it is. Female E. balteatus. |
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| ValerioW |
Posted on 30-08-2014 16:37
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
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. |
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| Lucgast |
Posted on 31-08-2014 05:53
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Member Location: Posts: 163 Joined: 12.11.12 |
Thanks, very interesting and first time I see a different one. Are these dark versions rare? Luc |
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| Stephane Lebrun |
Posted on 31-08-2014 07:29
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Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
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. |
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| ValerioW |
Posted on 31-08-2014 11:46
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
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. |
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| Stephane Lebrun |
Posted on 31-08-2014 12:19
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Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
Come in North of France, you'll see ones ! August was just as warm as October.
Stephane. |
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| christoophe |
Posted on 31-08-2014 12:21
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 Member Location: France Provence Posts: 1973 Joined: 06.02.08 |
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 |
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| ValerioW |
Posted on 31-08-2014 14:02
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Member Location: Padova - Italy Posts: 982 Joined: 01.06.12 |
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. |
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| Paul Beuk |
Posted on 02-09-2014 10:09
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 Super Administrator Location: Netherlands Posts: 19365 Joined: 11.05.04 |
They all look like intersexes: most markings obscured, frons narrower than in regular females and no distinct genitalia.
Paul - - - - Paul Beuk on https://diptera.info |
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