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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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.
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.

Female Baetisca laurentina (Armored Mayfly) Mayfly Spinner Pictures

Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Lateral view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Ventral view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin
Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin

This mayfly was collected from the Bois Brule River in Wisconsin on June 1st, 2005 and added to Troutnut.com by Troutnut on May 24th, 2006.

Discussions of this Spinner

hooks
5 replies
Posted by Flytyer0423 on Aug 20, 2009
Last reply on Oct 1, 2009 by Flyguy212
Jason-

i was wondering if you know about what sized hook these go ono've been tring to make a realistic mayfly for all the mayflies you have on here and i cant find any patterns for this fly so i have nothing to go off of

Thanks-
NatureBoy

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Female Baetisca laurentina (Armored Mayfly) Mayfly Spinner Pictures

Collection details
Location: Bois Brule River, Wisconsin
Date: June 1st, 2005
Added to site: May 24th, 2006
Author: Troutnut
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