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The Specimen

Amphinemura (Tiny Winter Blacks) Stonefly AdultAmphinemura (Tiny Winter Blacks) Stonefly Adult View 5 PicturesA few of these tiny stoneflies were among the only species of aquatic insect adults in the air on this particular afternoon, with most of the action coming from a species of Epeorus mayfly. I somehow forgot to photograph this one on the usual ruler, but I recall it was very, very small, with an abdomen no more than 1mm in girth and the body, not counting the wings, probably just 5-7mm long.
Collected September 6, 2006 from Mystery Creek #23 in New York
Added to Troutnut.com by on October 3, 2006

The Discussion

JaneBugJanuary 25th, 2007, 6:36 pm
Posts: 1The stonefly in this series of photos is not a Capniidae. It is a Nemouridae, a female Amphinemura. The yellow abdomen has eggs inside. Message from a stonefly researcher from Pennsylvania.
TroutnutJanuary 25th, 2007, 8:33 pm
Administrator
Bellevue, WA

Posts: 2689
Thanks! I've switched her over to that genus.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonJanuary 26th, 2007, 7:34 am
Site Editor
Plano, TX

Posts: 1314
JaneBug-

Perhaps you could educate me a bit concerning female adult stonefly anatomy. What are those abdominal appendages (pointed to by red arrows) called in my blowup of Jason's ventral photo?



In case JaneBug is not still monitoring this thread, if anyone else knows the answer to my question, please enlighten me. Thanx.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TaxonJanuary 27th, 2007, 10:21 pm
Site Editor
Plano, TX

Posts: 1314
David-

Three tails? Seems like one too many.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJanuary 28th, 2007, 9:12 am
Administrator
Bellevue, WA

Posts: 2689
I don't think he's suggesting three tails. The two lower arrows look like they're both pointing to the same bottom tail. What is that middle one supposed to be pointing at?
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonJanuary 28th, 2007, 10:03 am
Site Editor
Plano, TX

Posts: 1314
Jason-

Is the lower tail bent back on itself or something? If so, the middle arrow is pointing at the bent back section. Otherwise, there would appear to be a second appendage just above the lower tail, at which the middle arrow is pointing.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJanuary 28th, 2007, 12:03 pm
Administrator
Bellevue, WA

Posts: 2689
Hmm... if I look at it just right, the wing vein pattern in the background kinda forms a shape that could be mistaken for an abdominal appendage. Is that what you're looking at?

I'm really just seeing the two obvious symmetrical structures, top and bottom. It's very possible that you have a monitor that really brings out the contrast in that picture and makes something else look like part of the abdomen. (I can kind of see something if I tilt my laptop LCD just right, but I think it's nothing.)
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonJanuary 28th, 2007, 2:54 pm
Site Editor
Plano, TX

Posts: 1314
Jason-



Hopefully, this will help. I've blown it up about 50%, turned up the contrast significantly, and labeled the arrows. I'm talking about the appendage, labeled b, which comes straight out of the abdomen, as compared to the appendage labeled c, which comes out at a slightly upward angle as compared to the (imaginary) horizon.

Can you see it better now?
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutJanuary 28th, 2007, 4:49 pm
Administrator
Bellevue, WA

Posts: 2689
I think what you've labeled appendage C is not an appendage, but a shadow or vein on the wings in the background. A and B are matching appendages on either side of the abdomen, and C is an illusion. I think.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
CaseyPJanuary 28th, 2007, 6:15 pm
Arlington, VA/ Mercersburg, PA

Posts: 653
on my monitor, imagine a dumbbell on end. a shows the top bell and b and c show the bottom bell. what's hard to see is the bottom of the rounded shape of the top cerci.

i think...
"You can observe a lot by watching." Yogi Berra

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