Diptera.info :: Identification queries :: Diptera (adults)
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 Chironomidae
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| nielsyese |
Posted on 18-03-2012 15:04
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 Member Location: Yerseke, NL Posts: 2358 Joined: 13.02.09 |
Can someone make a genus ID? 8,2 mm. Found in Yerseke, the Netherlands. For pictures, see http://waarneming...w/63771469
Best wishes, Niels-Jan Dek |
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| John Carr |
Posted on 18-03-2012 15:43
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 Super Administrator Location: Massachusetts, USA Posts: 10475 Joined: 22.10.10 |
Probably Chironomus (Chironomus). Does the fore tarsus have long hairs on the distal half of segment 1 and segment 2? What is the ratio of lengths of fore tibia:tarsus-1? Is the third segment of the fore tarsus distinctly shorter than the second? Does the pronotum have a broad, deep notch or a narrow, shallow notch? (The last two questions ensure that I'm not mistaking Glyptotendipes, which has similar genitalia.) Is it likely to have come from fresh or brackish water? |
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| nielsyese |
Posted on 20-03-2012 19:50
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Member Location: Yerseke, NL Posts: 2358 Joined: 13.02.09 |
Hi John, there are longer hairs in distal half of tarsus I, segment 1 and 2. The lenght of fore tibia is about 0,17 mm, tarsus 1 is 0,21 mm, so 1:1,24. The third segment of the fore tarsus is distinctly shorter than the second. I don't know how I should interprete the notch so I included a picture of it.
nielsyese attached the following image:  [42.5Kb] Best wishes, Niels-Jan Dek |
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| John Carr |
Posted on 21-03-2012 02:53
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Super Administrator Location: Massachusetts, USA Posts: 10475 Joined: 22.10.10 |
The notch I see appears to be the front of the scutum. The pronotum is much smaller and partially concealed underneath. In Chironomus it projects forward in the middle and has a shallow notch.  In Glyptotendipes the notch is very broad and deep. Also, the frontal tubercles tend to be larger in Chironomus. They are visible between antenna bases here:  |
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| nielsyese |
Posted on 23-03-2012 19:37
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Member Location: Yerseke, NL Posts: 2358 Joined: 13.02.09 |
Ah, now I see what you mean. The notch is indeed shallow and not deep.
nielsyese attached the following image:  [44.74Kb] Best wishes, Niels-Jan Dek |
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