Diptera.info :: Family forums :: Syrphidae
 What do you think?
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| amalia_raluca |
Posted on 12-11-2007 20:29
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 Member Location: Romania Posts: 590 Joined: 22.03.07 |
I found last summer this specimens of Chrysotoxum elegans(hope it is the right ID). when I collected and I saw those aberrations I thought the pollution had a strong impact on them. My first thought was the pollution because near the collecting site (Iron Gates Natural Park, Sirinia Valley) in the recent past was a coal exploitation. What is your ideas?
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| Paul Beuk |
Posted on 12-11-2007 20:31
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 Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
As far as I am aware these aberrations might also be cause by 'damage' on the puparium, like a bump during pupal stage or some continuous pressure.
Paul - - - - Paul Beuk on https://diptera.info |
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| amalia_raluca |
Posted on 12-11-2007 20:31
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Member Location: Romania Posts: 590 Joined: 22.03.07 |
this one has an aberration which looks like a scutellum
amalia_raluca attached the following image:  [91.89Kb] |
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| amalia_raluca |
Posted on 12-11-2007 20:33
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Member Location: Romania Posts: 590 Joined: 22.03.07 |
and a last one..
amalia_raluca attached the following image:  [67.57Kb] |
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| amalia_raluca |
Posted on 13-11-2007 20:34
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Member Location: Romania Posts: 590 Joined: 22.03.07 |
Thank you Paul for your answer. That it is an idea that I didnt't take in account. now when I am thinking i realize that it might be a possibility. Maybe somebody else has another ideas... |
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| Kahis |
Posted on 13-11-2007 22:51
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 Member Location: Helsinki, Finland Posts: 1999 Joined: 02.09.04 |
I suspect that they may be caused by parasitoids - only in these cases the host 'wins' and manages to kill the parasite larva before it causes too much damage. I have no real evidence for the hypothesis, but it is probably significant that this type of aberrantions in rather common in Syrphinae which predatory larvae, but less so in other flies with less accessible larval stages.
Kahis |
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| Andre |
Posted on 14-11-2007 00:16
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 Member Location: Tilburg, the Netherlands Posts: 2111 Joined: 18.07.04 |
Did you only find this in C. elegans? If it's pollution, you would expect abberations on other parts of the body as well. Head, legs, wings... etcetera. More likely Paul's idea comes closer. Perhaps it can have it's ground in the places where they hatch from pupa to adult stage. Not only inside the cocoon, but also in the vulnerable moments as 'fresh-and-soft' adults right after hatching. Try to find the larvae/pupa  It's certainly odd... for sure, especially picture 2... Edited by Andre on 14-11-2007 00:19 |
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| amalia_raluca |
Posted on 14-11-2007 12:11
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Member Location: Romania Posts: 590 Joined: 22.03.07 |
Thank you...I will search more next year and yes from this area I have only C. elegans with this kind of abberations (and I have some other Chrysotoxum sp. from that site)... Amalia |
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