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Gnats, Gall Midges, and March Flies (Bibionomorpha)
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Fungus Gnats and Gall Midges (Sciaroidea)
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Dark-winged Fungus Gnats (Sciaridae)
Photo#385760
Copyright © 2010
Arlo Pelegrin
Bib2
Zebra Canyon, Garfield County, Utah, USA
March 28, 2010
Size: 1mm
This is the maximum possible resolution with my equipment.
Images of this individual:
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Contributed by
Arlo Pelegrin
on 16 April, 2010 - 9:11am
Last updated 17 January, 2013 - 5:27pm
Moved
Moved from
larvae and wingless adults
.
…
Arlo Pelegrin
, 17 January, 2013 - 5:27pm
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Moved
Moved from
Bibionomorpha
.
…
John F. Carr
, 20 May, 2010 - 10:46am
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Moved
Moved from
ID Request
.
…
Arlo Pelegrin
, 16 April, 2010 - 6:37pm
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Lighting
The resolution is adequate but the features are in shadow. The bright part at top is causing the rest to be underexposed.
After brightening the image I think I see an eye bridge, a single row of facets connecting the two compound eyes. I also think I see a tibial spur, which according to Arnett rules out the gall midges. (But I'm not confident in Arnett's handling of wingless gnats.)
Can you check with your eye under a scope to see if there is an eye bridge, tibial spurs, and 2 or 3 ocelli?
Likely options assuming tibial spurs are
(1) 1-segmented palp, no eye bridge = Sciaridae, probably
Pnyxia
, possibly
Epidapus
(2) 1-segmented palp, 1-facet eye bridge = Sciaridae:
Epidapus
(3) 2-3 segmented palp, 2-3 facet eye bridge = Sciaridae:
Bradysia
I think I see a 2-segmented palp and a 1-facet eye bridge, which does not compute.
If it completely lacks tibial spurs it probably belongs in Lestremiinae.
For now they can go to Bibionomorpha.
…
John F. Carr
, 16 April, 2010 - 5:34pm
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