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.

Stream photos

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Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington

With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.

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Tiny Mayfly ID help please.

Quagmireage has attached this picture to aid in identification. The message is below.

Quagmireage
Somerset, PA

Posts: 4

Quagmireage on Mar 28, 2019March 28th, 2019, 6:46 am EDT

Hi folks.
I found this nymph in the Keystone Select section of Laurel Hill Creek, Somerset county PA. It's really small(20-24, maybe smaller). Sorry to be so vague. If anyone has an idea what it might be, I'd love to know.

Thanks!

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Mar 29, 2019March 29th, 2019, 1:14 pm EDT

Clark - I'm pretty sure this is a member of the Baetidae family. As to the genus your guess is as good as mine. You'll need to dissect the mouth parts to figure out genus.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Quagmireage
Somerset, PA

Posts: 4

Quagmireage on Mar 29, 2019March 29th, 2019, 1:25 pm EDT

Thanks.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Mar 29, 2019March 29th, 2019, 1:42 pm EDT

The more I look at it the more it looks like it might be an early instar of Baetis tricaudatus. Google it and see what you think.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Konchu

Site Editor
Indiana

Posts: 498

Konchu on Apr 3, 2019April 3rd, 2019, 4:44 am EDT

If the tails are banded, rather than a solid color, then this probably is either Baetis flavistriga or something close. The markings on the abdominal terga also remind me much more of flavistriga than tricaudatus.