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Diptera.info :: Family forums :: Syrphidae
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Chrysotoxum sp.?
Maik Hausotte
#1 Print Post
Posted on 06-06-2020 12:06
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Hello,
is this fly a Chrysotoxum species ?
Thanks for your help,
Maik

Photo: Leipzig, Saxony/Germany, 20.05.2020
Maik Hausotte attached the following image:


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Sundew
#2 Print Post
Posted on 07-06-2020 00:39
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Location: Berlin, Germany
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Joined: 28.07.07

Chrysotoxum it is, and all the keys (e.g. https://books.goo...BXoECAkQAQ) beginn with length comparison of the three antennal segments - hopeless in your pictures. But there are not so many species that have (a) a black abdomen with yellow bands of equal width on (b ) tergites 2-5 and (c) the yellow bands do not reach the margin. We arrive at C. festivum and C. vernale. As the yellow bands are straight with the outer ends curved, C. festivum seems to be the better candidate. In this case, the femora 1+2 should be completely yellow, whereas C. vernale has homogeneously straight to slightly curved bands and femora 1+2 with black bases (there is a mistake in Steven Falk's description who writes that tibiae 1+2 have black bases). So, by overall appearance I tend to C. festivum!
This literature is also recommended: https://www.biodi...y-2015.pdf. Of course, it does not cover all of our species, but it helps to learn a lot.
Regards, Sundew
Edited by Sundew on 07-06-2020 00:41
 
Maik Hausotte
#3 Print Post
Posted on 07-06-2020 21:00
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Thank you for the wonderful derivation and the great literature sources. Best regards, Maik
 
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07.08.20 08:12
They are already in Poland !

04.08.20 21:02
Today a Chrysomya albiceps found in North of France ! I was quite surprised !

02.08.20 10:10
Ok... lower case naming for images.. understood,Lothar

02.08.20 10:02
I uploadad a jpg, but it is not visible in the thread...Lothar

30.07.20 21:32
Have you checked the FAQ already?

30.07.20 02:23
cannot upload photos, it says wrong name. can someone please explain the exact procedure and the does and donts?

19.07.20 15:41
Don't use the preview, post directly.

17.07.20 01:44
Hi, apologies but also can't get photos to load. They are jpg, <300K, no spaces in names. Help? Smile

16.07.20 10:34
Hi Anders. No blanks in filename permitted

11.07.20 17:55
Hi I seem to have problem posting photos in the forum. Any idea what I'm doing wrong. File size around 200 kB. File extension lower case (.jpg).?

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