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subgenus Isocladius (Cricotopus subgenus Isocladius)
Photo#114876
Copyright © 2007
Steve Nanz
Midge -
Cricotopus
-
Brooklyn, Kings County, New York, USA
May 26, 2007
Size: 2 mm
Shot one of these midges last year. I believe it's a female. This a better photo. I belive that the linked photo is a male of the same species. Came to UV light.
Images of this individual:
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Contributed by
Steve Nanz
on 3 June, 2007 - 5:17am
Last updated 17 January, 2009 - 9:02am
Moved
Moved from
Cricotopus
.
…
John F. Carr
, 17 January, 2009 - 9:02am
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Moved
Moved from
Midges
.
According to John Epler, this is probably C. sylvestris.
…
Steve Nanz
, 4 January, 2008 - 5:34pm
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Keys to trifasciatus
The key I am looking at distinguishes
Cricotopus sylvestris
and
C. flavibasis
from
C. trifasciatus
and
C. tricinctus
thus:
10. At least one tergite in addition to abd 1 all or nearly all yellow-white; abd 1, 4 and 7 typically yellow-white ... (11)
10. Tergites behind abd 1 in no case all yellow-white or yellow-white with a dark saddle ... (12)
11 distinguishes
C. trifasciatus
and
C. tricinctus
12 distinguishes
C. sylvestris
and
C. flavibasis
If there is a dark ring at the front or back of a segment, I might be applying the key wrong if that counts as not "all yellow-white or yellow-white with a dark saddle."
Edit: The paper notes in text elsewhere that
C. sylvestris
is "the dominant species living in
Myriophyllum spicatum
in the Hudson River Estuary" and "when tergite 4 is light resemblence to
C. trifasciatus
is strong."
…
John F. Carr
, 16 December, 2008 - 7:53pm
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Back to Cricotopus sylvestris?
This key seems to contradict comments on
Photo #245295
. It would be nice to know if either the key is bad or I'm misunderstanding it.
Since Dr. Epler previously made a tentative ID for this midge to
Cricotopus sylvestris
and it seems to matches the midges in Photo #245295, I'm wondering if it should be moved to species.
…
Steve Nanz
, 26 September, 2010 - 4:22am
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Don't know
Dr. Epler has warned me that Boesel's key is unreliable in separating members of the species group and I don't know how confident a "probably" from him is. (This is all a matter of language use and not a matter of expertise. Some people use probably to mean 51+% and others use to mean almost certainly.)
…
John F. Carr
, 26 September, 2010 - 8:50am
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Yep
That's what I was thinking and why I didn't just move it myself.
…
Steve Nanz
, 26 September, 2010 - 9:03am
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Image Added
I added an image in attempt to make sense of the abdominal segments. I am basing this interpretation on images I just added
here
.
…
Steve Nanz
, 18 December, 2008 - 5:11am
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Cricotopus Sp.
Found images of Cricotopus lebetis which look similar,
here
.
…
Steve Nanz
, 26 June, 2007 - 4:00am
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