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Diptera.info :: Identification queries :: Diptera (eggs, larvae, pupae)
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larva in Fraxinus gall
Carnifex
#1 Print Post
Posted on 02-03-2022 11:21
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Location: Vienna, Austria
Posts: 1600
Joined: 23.06.15

I collected this gall (induced by the mite Aceria fraxinivora) on the ground of a backyard in Vienna, so the larva might have come from the soil.

It produced some sticky threads (in the first photo, with a dead bark louse). In the last two photos, a needle-like structure is visible in the head region

inaturalist-open-data.s3.amazonaws.com/photos/178458879/large.jpeg
inaturalist-open-data.s3.amazonaws.com/photos/178458904/large.jpeg
inaturalist-open-data.s3.amazonaws.com/photos/178458924/large.jpeg
inaturalist-open-data.s3.amazonaws.com/photos/178737659/large.jpeg
inaturalist-open-data.s3.amazonaws.com/photos/178737668/large.jpeg
Edited by Carnifex on 02-03-2022 11:21
Cheers, Lorin

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All requests are from the urban area of Vienna, if not otherwise stated.

My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated.
 
Jan Maca
#2 Print Post
Posted on 02-03-2022 20:45
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A cecidomyiid, Arthrocnodax fraxinellus, is considered a predator of Aceria fraxinivora. The structure in the head region may be spatula sternalis. I do not know if cecidomyiids can produce sticky threads.
 
Carnifex
#3 Print Post
Posted on 02-03-2022 21:41
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Yes, Arthrocnodax, that was my target species - I was collecting these galls to search for them, and actually was successful:
inaturalist-open-data.s3.amazonaws.com/photos/179392315/large.jpeg

But these larvae look quite different (and are smaller), and I do not know whether later stages would transform so much but I am sceptical.
I mentioned the structure in the head because I was thinking of spatula sternalis as well - so maybe Arthrocnodax, maybe another Cecidomyiid, maybe s.th. different?
Cheers, Lorin

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All requests are from the urban area of Vienna, if not otherwise stated.

My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated.
 
Jan Maca
#4 Print Post
Posted on 03-03-2022 14:16
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Well, it is even not excluded that small yellow larvae are cecidomyiids (Arthrocnodax?)and the larger ones might be e. g. ceratopogonids. Interesting case, hopefully you shall obtain imagoes.
 
Carnifex
#5 Print Post
Posted on 10-03-2022 10:19
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Stored in absolute EtOH, I fear its development is impeded for the foreseeable future...
Cheers, Lorin

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All requests are from the urban area of Vienna, if not otherwise stated.

My Diptera observations (and other living forms) can be found here, and corrections or comments over there would also be appreciated.
 
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