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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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Benthosfan has attached these 7 pictures to aid in identification. The message is below.
Baetidae #1
Baetidae #2
Baetidae #3
Baetidae #4
Baetidae #5
Baetidae #6
Baetidae #7
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Feb 2, 2021February 2nd, 2021, 10:53 am EST
Hi Steve,

I wish I could help more with these. It's almost impossible to key most Baetidae beyond the family level without extreme closeups of some tiny, hard to access parts on the mouth and elsewhere. This board is occasionally visited by experts who might recognize one (at least the genus) based on the general "look." However, that ability comes only from extensive personal experience and can't be gleaned from any available key unfortunately.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Partsman
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bancroft michigan

Posts: 321
Partsman on Feb 6, 2021February 6th, 2021, 1:36 am EST
Very nice pictures, thanks for sharing. I hope you some answers to your questions.
Mike.
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 6, 2021February 6th, 2021, 5:52 am EST
Family="Baetidae"
USA_States="OK"

Family Scientific Name

Baetidae Acentrella turbida 2 tails as nymph
Baetidae Acerpenna macdunnoughi 3 tails as nymph
Baetidae Acerpenna pygmaea 3 tails as nymph
Baetidae Anafroptilum minor 3 tails as nymph
Baetidae Apobaetis futilis 2 tails as nymph
Baetidae Baetis bicaudatus 2 tails as nymph
Baetidae Baetis flavistriga 3 tails as nymph
Baetidae Baetis intercalaris 3 tails as nymph
Baetidae Callibaetis floridanus 3 tails as nymph
Baetidae Callibaetis pictus 3 tails as nymph
Baetidae Camelobaetidius mexicanus 3 tails as nymph
Baetidae Camelobaetidius variabilis 3 tails as nymph
Baetidae Diphetor hageni 3 tails as nymph
Baetidae Fallceon quilleri 3 tails as nymph
Baetidae Heterocloeon curiosum 2 tails as nymph
Baetidae Iswaeon rubrolaterale 2 tails as nymph
Baetidae Neocloeon alamance ? tails as nymph
Baetidae Plauditus dubius 2 tails as nymph
Baetidae Plauditus punctiventris 2 tails as nymph
Baetidae Procloeon pennulatum 3 tails as nymph
Baetidae Procloeon rubropictum 3 tails as nymph
Baetidae Procloeon texanum 3 tails as nymph
Baetidae Procloeon viridoculare 3 tails as nymph

Note: there are multiple genera in your images, as some have 2 tails and some have 3 tails
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Feb 8, 2021February 8th, 2021, 5:40 pm EST
Benthosfan, even getting high quality pictures won't necessarily make the ID easy. I got a really nice microscope setup myself this fall and still really struggle with the relevant parts of Baetids. For example, it's often not enough to just get an in-focus closeup of the underside of the head: you have to tease out specific parts that might normally be hidden, and photograph them at just the right angle to see the relevant tiny details. There's a patch of tiny setae called the "villipore" on the legs that's also extremely difficult to see, let alone image, with most microscopes.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Apr 2, 2021April 2nd, 2021, 10:22 am EDT
Confirmed possible IDs for ...

#7 is Acentrella parvula or Oxyethira


Oxyethira a caddisfly genus. Happy April Fools Day?
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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