Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Stream photos

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Skwala (Large Springfly) Stonefly Nymph Skwala (Large Springfly) Stonefly Nymph

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.

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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.