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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.
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Anafroptilum conturbatum (Tiny Sulphur Dun) Mayfly Nymph Pictures

A moderately rare mayfly perhaps because the nymphs are fragile that nymphs are usually damaged in collection making identification more difficult.

This mayfly was collected from Bowman Lake in Montana on July 12th, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.

Discussions of this Nymph

Brachycentrus?
14 replies
Posted by Creno on Jan 29, 2011
Last reply on Jul 12, 2011 by Creno
Perhaps you meant Brachycercus - or whatever it is today?

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References

Anafroptilum conturbatum (Tiny Sulphur Dun) Mayfly Nymph Pictures

Collection details
Location: Bowman Lake, Montana
Date: July 12th, 2007
Added to site: June 26th, 2011
Author: Bnewell
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