Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > Baetis adult species IDs?

The Specimen

Baetis tricaudatus (Blue-Winged Olive) Mayfly SpinnerBaetis tricaudatus (Blue-Winged Olive) Mayfly Spinner View 12 PicturesSome notes from identifying this specimen under the microscope:

1. The hind wing has three longitudinal veins (Longitudinal vein: Longitudinal veins are the major long veins running length-wise through an insect's wing, connecting the base to the outer margin, or the major branches from those veins.), but the third is faint, short (about half the length of the wing), and close to the wing margin.
2. Then antenna is brown fading into white at the tip, and the base is ringed with white.
3. The joints of the tarsal segments on the middle and hind leg have fine black markings.

It was also collected in association with a female spinner.
Collected September 4, 2020 from Silver Creek in Idaho
Added to Troutnut.com by on September 18, 2020

The Discussion

Post Reply
TroutnutNovember 6th, 2020, 8:16 pm
Administrator
Bellevue, WA

Posts: 2736		Does anyone here know any decent resources for identifying adult Baetis? I haven't found much.

This specimen sure seems to nicely fit the original description of Baetis alius adults. But I can't find very precise descriptions (let alone a key) for flavistriga and tricaudatus, both of which are other likely options given the location.

These made for a good fishable hatch on Silver Creek, so it sure would be nice to know what they are.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.
Most Recent Posts
I build landing nets & this is my favorite one of the year
In Gear Talk by TinaLewis
Western montana
In General Discussion by Flycrazy
Re: Thanksgiving
In General Discussion by Michimike (Jmd123 replied)