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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.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jun 4, 2007June 4th, 2007, 10:33 am EDT
I spent 5 days last week going around Pennsylvania fishing some of the famous rivers there in both the central limestone region and the Poconos. I also met and/or fished with Gonzo, Martinlf, and Shawnny3 from this forum, which was really fun. Along the way I collected lots of interesting new bugs for the site, and I just finished putting them online. I'll try to work on the IDs tonight but, as usual, I would welcome any help.

Here are the new specimens, ordered by location:

Collected in Catskills, hatched in aquarium

http://www.troutnut.com/specimen/731 - Female Baetisca obesa mayfly dun.

http://www.troutnut.com/specimen/732 - Adult Perlid stonefly

Central limestone region of PA

http://www.troutnut.com/specimen/733 - Maccaffertium mediopunctatum female dun

http://www.troutnut.com/specimen/734 - Male Ephemerella dorothea dun

http://www.troutnut.com/specimen/735 - Female Ephemerella dorothea dun

http://www.troutnut.com/specimen/736 - Male Ephemera guttulata spinner (Coffin Fly)

http://www.troutnut.com/specimen/737 - Male Ephemerella dorothea dun

http://www.troutnut.com/specimen/738 - Isonychia bicolor dun (interesting because of the white stripe down the back in the dun, not just the nymph)

http://www.troutnut.com/specimen/739 - Ephemerella dorothea spinner

http://www.troutnut.com/specimen/740 - Male Ephemerella spinner

http://www.troutnut.com/specimen/741 - Male Epeorus spinner

Poconos

http://www.troutnut.com/specimen/742 - Female Drunella lata spinner

http://www.troutnut.com/specimen/743 - Male Ephemerella dorothea dun

http://www.troutnut.com/specimen/744 - Unidentified caddis adult

http://www.troutnut.com/specimen/745 - Unidentified female Ephemerella spinner

http://www.troutnut.com/specimen/746 - Peltoperlidae stonefly adult

http://www.troutnut.com/specimen/747 - Male Epeorus dun

http://www.troutnut.com/specimen/748 - Female Maccaffertium spinner

http://www.troutnut.com/specimen/749 - Male Epeorus spinner

http://www.troutnut.com/specimen/750 - Female Heptageniid spinner

http://www.troutnut.com/specimen/751 - Hydropsychid caddisfly

http://www.troutnut.com/specimen/752 - Male Drunella lata dun

http://www.troutnut.com/specimen/753 - Female Drunella lata dun

http://www.troutnut.com/specimen/754 - Male adult Nigronia serricornis fishfly

http://www.troutnut.com/specimen/755 - Male Baetid dun

http://www.troutnut.com/specimen/756 - Perlid stonefly adult

http://www.troutnut.com/specimen/757 - Inchworm

http://www.troutnut.com/specimen/758 - Caddis pupa?? This thing is really strange.

http://www.troutnut.com/specimen/759 - Little green stonefly - Chloroperlidae?

http://www.troutnut.com/specimen/760 - Big cranefly - Tipulidae?

http://www.troutnut.com/specimen/761 - Baetid nymph

http://www.troutnut.com/specimen/762 - Drunella lata nymph

http://www.troutnut.com/specimen/763 - Cinygmula nymph

http://www.troutnut.com/specimen/764 - Maccaffertium nymph, probably mediopunctatum

http://www.troutnut.com/specimen/765 - Maccaffertium dun of the same species as the nymph above, probably mediopunctatum

http://www.troutnut.com/specimen/766 - Ephemerella dorothea nymph

http://www.troutnut.com/specimen/767 - Paragnetina immarginata stonefly nymph

http://www.troutnut.com/specimen/768 - Corydalus hellgrammite

http://www.troutnut.com/specimen/769 - Female Baetid mayfly dun

Back to the Catskills

http://www.troutnut.com/specimen/770 - Psilotreta labida caddis adult

http://www.troutnut.com/specimen/771 - Green drake dun (Ephemera guttulata)

http://www.troutnut.com/specimen/772 - Ephemerella septentrionalis mayfly dun

http://www.troutnut.com/specimen/773 - Male Ephemerellid dun - Serratella?

http://www.troutnut.com/specimen/774 - Female coffin fly (Ephemera guttulata spinner)

http://www.troutnut.com/specimen/775 - Female Paraleptophlebia dun

A few notes:


  • I identified several duns as Ephemerella dorothea as a guess based on size. The nymph, however, I carefully keyed out.

  • All the Drunella specimens belong to the form of Drunella lata formerly known as Drunella cornuta.

  • All the Baetids come from nearly identical nymphs I collected (the two duns hatched in my sorting bowl) so they're probably the same species.

  • I've got a few new Maccaffertium specimens I'm guessing are mediopunctatum. I'm saying that for the nymph based on the postero-lateral projections on abdominal segments anterior to 6, and on the color pattern on the sternites. It's not quite what I've seen in keys for that species, or in my older specimens, but I think it's the closest possibility. I've labeled the male dun as that species because it hatched from a nearly identical nymph. And I'm labeling the female dun because she has about the same color pattern as the male. She is a couple mm larger, though, which makes me question this ID.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Quillgordon
Schuylkill County, PA.

Posts: 109
Quillgordon on Jun 4, 2007June 4th, 2007, 10:57 am EDT
Jason,
Very impressive collection!

Two questions.........

1. Are the duns and spinners alive when you photograph them?
2. Did you get time to fish ?

Thank you,
John
Flyfishing is a state of mind! .............. Q.g.

C/R........barbless
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jun 4, 2007June 4th, 2007, 12:02 pm EDT
Most of them are alive when I shoot them. I sometimes photograph dead bugs, but it's usually only if I don't have any live ones and they haven't been dead for too long.

Collecting bugs doesn't cut into my fishing time very much, because I usually just scoop them up off the water (or out of the air) when they drift by while I'm fishing. Photographing them is the really time-consuming part, but that doesn't cut into my fishing time -- it cuts into my sleeping time!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Jun 4, 2007June 4th, 2007, 12:15 pm EDT
Which paper did you use on the Ephemerella that you "carefully keyed out"? Just curious...
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jun 4, 2007June 4th, 2007, 4:46 pm EDT
Allen & Edmunds. I know it's a bit old, but this one seems to fit dorothea very neatly. Is there a better source?

I do have a couple of the more recent revision papers, but as far as I know they wouldn't affect this ID.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Jun 5, 2007June 5th, 2007, 2:12 am EDT
dorothea/excrucians nymphs are tough to tell apart. lots of things will key really easily and neatly with Allen & Edmunds' key, but the result can be wrong. if you're cautious, the shape of the claw can work sometimes to sort out the two nymphs. but even that can be sketchy.
Quillgordon
Schuylkill County, PA.

Posts: 109
Quillgordon on Jun 5, 2007June 5th, 2007, 6:36 am EDT
Looking at the two specimens that Jason has listed from 5/29/07 (E. dorothea) and 6/9/05 ( E. excrucians)..... the leg markings and the dorsal (segments) look quite different!
They don't seem similar at all...... what am I missing here ?

John...
Flyfishing is a state of mind! .............. Q.g.

C/R........barbless
Konchu
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Site Editor
Indiana

Posts: 498
Konchu on Jun 5, 2007June 5th, 2007, 11:28 am EDT
E. excrucians, and probably to a lesser extent E. dorothea, can show some extreme color variation within single populations.
Quillgordon
Schuylkill County, PA.

Posts: 109
Quillgordon on Jun 5, 2007June 5th, 2007, 11:43 am EDT
Konchu,
Well, that would make things even more confusing then!
I was aware of color variations from different streams/regions, but not within a local area.
OK....... still learning!

Thanks....
John
Flyfishing is a state of mind! .............. Q.g.

C/R........barbless

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