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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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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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Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Aug 18, 2014August 18th, 2014, 8:30 pm EDT
Bruce, you very well know they renamed her Kendra. Show some respect!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Healdsburg, CA

Posts: 344
Millcreek on Aug 19, 2014August 19th, 2014, 9:46 am EDT
I know for a fact you sit at home in the evening cooking in your Easy Bake Oven and dressing up your transgender Ken Doll.

I've heard of anatomically correct dolls but what's transgender Ken, anatomically incorrect or anatomically ambiguous?
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Portage, PA

Posts: 437
Lastchance on Aug 19, 2014August 19th, 2014, 1:56 pm EDT
I guess I'd go with ambiguous. HA!
Crepuscular's profile picture
Boiling Springs, PA

Posts: 920
Crepuscular on Aug 20, 2014August 20th, 2014, 2:20 pm EDT
I apologize to all for starting this. Can we lock this thread down now before it sinks any lower.
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Aug 20, 2014August 20th, 2014, 10:05 pm EDT
Done... ;)
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Cincinnati, OH

Posts: 13
TroutBums on Oct 8, 2014October 8th, 2014, 6:01 pm EDT
Interesting pictures, food for thought, at least for the trout....and one shark. How about some photos of some flies of the mayfly or as Millcreek refers to the as: Drunella flavilinea, Ephemerella dorothea, Attenella soquele and to a lesser degree Serratella species. It is amazing how pretty these critters are when you see them "blown up."

Someone is tying these and it would be nice to see what they look like. Nothing like a well tied fly to hook into a trout thinking its about to eat a mayfly!
Ted Holcomb

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