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EntomanDecember 10th, 2013, 6:53 am
Northern CA & ID

Posts: 2604
Mack,

Anything's possible I suppose but it's highly doubtful. Perhaps you've been looking at too many Cahills?:)

The head capsule appears greatly swelled and expanded/distorted by the adult's eyes developing underneath. Even so, notice it is substantially smaller in width than the notum and even more so the mesonotum? On heptageniids the head capsule is wider or at least sub-equal to the notum which in turn is often wider but at least subequal to the meso. In other words, this critter's front end is tapered the other way.;) That's typically crawler... Something else worth mentioning is the length of thorax compared to the combined length of the head and abdomen. With heptageniids the thorax is usually substantially shorter. Notice this specimen's thorax is not only longer, it is disproportionately so? Exaggerated thorax size is also a common Ephemerelliodea character.

As for the legs - while being tucked against and/or under the body on both sides is not uncommon with dead heptageniid specimens, live ones perched on a rock usually have them splayed (at least on one side). This pose is more typically struck by a crawler. Crawlers can have beefy femora, too. Besides, notice the tibia is tucked against the femur you isolated thus increasing its perceived width? Another clue that doesn't look right around the house is Heptageniid femora are typically longer than this, often approaching the length if the thorax or longer and capable of reaching well down the abdomen (especially with the spidery looking Epeorus).

Oh, and don't forget Paul mentioned it was small trico or Caenis sized. That's awfully tiny for a mature heptageniid.;)

Hope this helps!
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
BrookymanDecember 11th, 2013, 7:16 pm
Banned
Posts: 797
Hi Kurt

Who says size doesn't matter !!! I didn't even see that one I leaped then looked. I think you are right on your call. BTW have you added any of my uploads to the encyclopedia yet ???. Please feel free too.


Mack.
Banned for threatening another user and then trying to circumvent a kinder "soft" ban with fake accounts
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