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.

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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington

This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.

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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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More mayflies from Spain. Ecdyonurus?

Isidro
Posts: 24

Isidro on Mar 26, 2008March 26th, 2008, 2:39 am EDT

This one is very common into my city and could be the adult of the nymph showed in the last thread. It's a big one, about 20 mm. wingspan. Two cerci, very big eyes and very conspicuous dark venation. Could be Ecdyonurus cf. venosus?

This one is about to becomes a ctrab spider lunch.

Zaragoza, NE Spain.

Many thanks,

Isidro

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Mar 26, 2008March 26th, 2008, 6:15 am EDT

Isidro-

Yes, Ecdyonurus venosus, however I suspect the body length (not including tails) may be more like 14 mm.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Isidro
Posts: 24

Isidro on Mar 26, 2008March 26th, 2008, 6:54 pm EDT

Wow!!! Many thanks Taxon!! You have identified it at species level! I had doubts because there are more similar species in genus. Yes, the body length, as you said, I thinks is about 15 mm. (without cerci).

Then, I think that the nymph in the last post is from this species, due to any other Ecdyonurus is seen into my city and this one is very common.