Diptera.info :: Identification queries :: Diptera (adults)
 Dolichocephala guttata-group
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| Sundew |
Posted on 22-10-2024 02:51
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 Member Location: Berlin and Baden-Württemberg, Germany Posts: 3931 Joined: 28.07.07 |
Hi, Yesterday I took insect pictures in a wetland in southwestern Germany and came across a remarkable tiny fly that was unknown to me. Some research led to Dolichocephala (Empididae), and I suppose it is either D. guttata or D. oblongoguttata, as the wings are only moderately spotted. BTW, GBIF still claims today that the latter species name is a synonym of the further, though Drake and Chandler (1997) made clear that both are valid species. I suppose we should follow their arguments, shouldn't we? Another species that is said to occur in our region is D. thomasi. Can this be excluded? I did not find a key or a description pointing out the differences. Thanks in advance for any comments! Sundew Sundew attached the following image:  [237.88Kb] Edited by Sundew on 22-10-2024 13:22 |
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| Sundew |
Posted on 22-10-2024 02:54
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3931 Joined: 28.07.07 |
Some more pics. My camera had difficulties focusing on the tiny fly, the Raynox macro lens reached its limits.
Sundew attached the following image:  [293.39Kb] |
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| Paul Beuk |
Posted on 22-10-2024 08:45
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 Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
D. thomasi belongs to the ocellata group but this is a species of the guttata group. These can only be indetified reliable using male genitalia. Your specimen(s?) are female or at least not showing male genitalia. So it will remain D. guttata group sp.
Paul - - - - Paul Beuk on https://diptera.info |
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| Sundew |
Posted on 22-10-2024 13:21
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Member Location: Berlin and Baden-Württemberg, Germany Posts: 3931 Joined: 28.07.07 |
Great - thanks for the confirmation. According to Meyer & Stark (2015) D. guttata and D. oblongoguttata are the only representatives of this group that occur here in Baden-Wuerttemberg. And you treat them as separate species, don't you? All pictures show the same female. Now that I know that genus, I hope to find further species. With 72, I am still learning! |
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| Paul Beuk |
Posted on 23-10-2024 07:57
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Super Administrator Location: Netherlands Posts: 19403 Joined: 11.05.04 |
Sundew wrote: Indeed, as does the recent key to Middle European aquatic Empididae.
you treat them as separate species, don't you? Paul - - - - Paul Beuk on https://diptera.info |
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