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Diptera.info :: Family forums :: Syrphidae
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Syrphus torvus << Syrphidae larva
CedricMondy
#1 Print Post
Posted on 05-06-2022 09:07
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Location: Île-de-France (France)
Posts: 69
Joined: 30.06.21

Hi everybody,

I found this larva on what I think was Lactusa virosa. I kept it and got an adult but the ID is still doubtful so perhaps someone familiar with larvae could help to clarify this.

So what would be your best guess for it?

Thanks in advance!

www.galerie-insecte.org/galerie/image/dos302/big/photos_20220419180032%203.jpg
Cédric Mondy : France : Saint-Maur-des-Fossés : 94100 : 19/04/2022
Altitude : 42 m - Taille : 10.5 mm
Réf. : 302661
Edited by CedricMondy on 12-06-2022 22:20
Cédric
 
eklans
#2 Print Post
Posted on 05-06-2022 09:59
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Location: Franconia, Germany
Posts: 2403
Joined: 11.11.18

Hi Cédric, I think it's a Syrphus ribesii, red colour form - the first image shows that the prp is about as long as broad and the spiracular openings extend over the sides of the prp.
(Colour Guide to Hoverfly Larvae, Graham E. Rotheray)
Greetings, Eric
 
CedricMondy
#3 Print Post
Posted on 05-06-2022 12:17
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Location: Île-de-France (France)
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Thank you Eric!
Based on the imago, we hesitated between Syrphus torvus and perhaps some Parasyrphus.

I will have a look to the guide you mention, thank you!
Cédric
 
CedricMondy
#4 Print Post
Posted on 12-06-2022 22:18
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Location: Île-de-France (France)
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Based on the imago obtained from this larva, this is Syrphus torvus.

eklans wrote:
Hello Cédric, I've compared your fly to my S. torvus which I found 2017-04-11 and the eyes look the same! So I'm quite sure it is S. torvus. Which means, that the larvae are very similar, too - which could be expected, I think.

Cédric
 
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