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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Btbo32 has attached this picture to aid in identification. The message is below.
Btbo32
Posts: 13
Btbo32 on Nov 18, 2017November 18th, 2017, 11:06 am EST
Can anyone please help me identify this nymph? I noticed this as I was zooming in on the maccafertium nymph. Found in North Jersey (Big Flatbrook) last month. Thanks!
Jersey Boy
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Nov 18, 2017November 18th, 2017, 5:18 pm EST
I'd suggest putting nymph on a white background and taking a larger photograph for identification. Our bug guys are good, but they may not be able to make out enough detail on the one posted here. A big white plastic cap from a cat litter jug would make a good background, or any lid with a white inside. Adding a little water might make the legs, tails, etc. stand out more.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Nov 19, 2017November 19th, 2017, 7:52 am EST
Hi Btbo32-

Based on (what I can see of) the body shape outline, my guess would be Isonychia.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Btbo32
Posts: 13
Btbo32 on Nov 19, 2017November 19th, 2017, 11:18 am EST
I know sorry it was the best image I could get. Thank you very much! I appreciate the help.
Jersey Boy
Btbo32
Posts: 13
Btbo32 on Nov 19, 2017November 19th, 2017, 11:21 am EST
That's a wonderful idea! I will bring one on the water next time I get out. Thanks for your help!
Jersey Boy

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