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 Chrysotoxum sp.?
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| Maik Hausotte |
Posted on 06-06-2020 11:06
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Member Location: Posts: 290 Joined: 09.12.19 |
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:  [66.53Kb] |
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| Sundew |
Posted on 06-06-2020 23:39
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3890 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 06-06-2020 23:41 |
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| Maik Hausotte |
Posted on 07-06-2020 20:00
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Member Location: Posts: 290 Joined: 09.12.19 |
Thank you for the wonderful derivation and the great literature sources. Best regards, Maik |
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but don't see the image in the post.
