Diptera.info :: Identification queries :: Diptera (adults)
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 Chironomus ? [Chironomini sp.]
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| lweit |
Posted on 25-03-2012 18:14
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
Found this little Nematocera in France between Metz and Thionville the 15/03/2012 C. Length 5 mm. Perhaps Chironomus riparius ? Thank you Louis lweit attached the following image:  [62.23Kb] Edited by lweit on 22-04-2012 10:32 |
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| lweit |
Posted on 25-03-2012 18:15
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
Another photo
lweit attached the following image:  [77.01Kb] |
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| lweit |
Posted on 25-03-2012 18:16
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
third photo
lweit attached the following image:  [83.83Kb] |
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| lweit |
Posted on 25-03-2012 18:17
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
And the last photo
lweit attached the following image:  [64.7Kb] |
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| John Carr |
Posted on 25-03-2012 18:23
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 Super Administrator Location: Massachusetts, USA Posts: 10474 Joined: 22.10.10 |
Chironomini. Could be Chironomus. I can't make out the shape of the pronotum or the male genitalia. |
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| lweit |
Posted on 25-03-2012 18:28
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
A photo of the end of the abdomen
lweit attached the following image:  [55.33Kb] |
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| lweit |
Posted on 25-03-2012 18:31
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
Another photo of the pronotum
lweit attached the following image:  [83.55Kb] |
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| John Carr |
Posted on 25-03-2012 23:57
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Super Administrator Location: Massachusetts, USA Posts: 10474 Joined: 22.10.10 |
The tip of the abdomen has been rotated so I see a side view and I can't make out the appendages between the large claspers. The middle of the pronotum is the interesting part. It usually has a notch which can be broad or narrow, shallow or deep. See: http://www.dipter...ost_200847. |
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| lweit |
Posted on 26-03-2012 17:23
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
Thank you John Here a photo of the part of the pronotum just after the head lweit attached the following image:  [105.98Kb] Edited by lweit on 26-03-2012 17:24 |
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| lweit |
Posted on 26-03-2012 17:41
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
And another photo of the end of the abdomen
lweit attached the following image:  [76.36Kb] |
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| John Carr |
Posted on 27-03-2012 01:07
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Super Administrator Location: Massachusetts, USA Posts: 10474 Joined: 22.10.10 |
Now I'm confused. If the gonostyli are folded in it isn't anywhere near Chironomus, which has them fused to gonocoxites. I have also noticed that R5 is much shorter than the wing and M ends near wingtip; the veins end equidistant from wingtip in the Chironomus group and most Chironomini. The short fore tibia does argue in favor of Chironominae but is hard to interpret without the fore tarsus to compare. The ratio (length of fore basitarsus / length of fore tibia) is nearly always 1 or greater in Chironominae and is less than 1 in other subfamilies (except for a few primitive Orthocladiinae). Do you recall how the front legs were held when it was alive? The fore femur of Chironominae is held elevated, usually vertical, and the legs are used like antennae. Other subfamilies use their legs as legs. |
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| lweit |
Posted on 27-03-2012 17:21
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Member Location: France, Département de la Moselle Posts: 609 Joined: 23.12.05 |
The only photo I have with the legs ? Thank you very much Louis lweit attached the following image:  [112.32Kb] |
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