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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.

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Cinygmula (Dark Red Quill) Mayfly Nymph Pictures

This very strange nymph appears to be undoubtedly Cinygmula, yet it lacks the telltale protruding mouthparts that usually make that genus so easy to identify.

This mayfly was collected from the Gulkana River in Alaska on July 17th, 2011 and added to Troutnut.com by Troutnut on July 20th, 2011.

Discussions of this Nymph

A Cinygmula nymph without protruding mouthparts?
12 replies
Posted by Troutnut on Jul 20, 2011
Last reply on Mar 28, 2013 by Brookyman
I've never heard of such a thing, yet here it is, unless I'm badly mistaken. The gills and all the other features scream Cinygmula, as does the fact that it was collected with hundreds of other Cinygmula nymphs representing (I think) at least two species.

Anyone know what's going on with the mouth?

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Cinygmula (Dark Red Quill) Mayfly Nymph Pictures

Collection details
Location: Gulkana River, Alaska
Date: July 17th, 2011
Added to site: July 20th, 2011
Author: Troutnut
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