Header image
Enter a name
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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Male Penelomax septentrionalis Mayfly Nymph Pictures

This is surely the most distinctive-looking species in Ephemerellidae. I like the rugged, spindly look. If mayflies made movies, Penelomax septentrionalis would probably play the supervillain.

Maybe I should take a break and get something to eat.

Ruler view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York The smallest ruler marks are 1 mm.
Dorsal view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Ventral view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
A hairy mayfly nymph. This gangly, odd-looking nymph is from the rare species Ephemerella septentrionalis

Artistic view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York
Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

This mayfly was collected from the Delaware River in New York on May 13th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Nymph

Great Photos
2 replies
Posted by Earlfishman on May 19, 2007
Last reply on May 19, 2007 by Troutnut
Jason,

The underwater photos are unreal. What sort of lens are you using on that camera? It is just now occuring to me to ask how many of your pictures on this site are taken through a scope and how many are taken with just a camera?

Earl

Start a Discussion of Nymph

Male Penelomax septentrionalis Mayfly Nymph Pictures

Collection details
Location: Delaware River, New York
Date: May 13th, 2007
Added to site: May 18th, 2007
Author: Troutnut
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy