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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 Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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 Amphinemura (Tiny Winter Black) Stonefly Adult Pictures

A few of these tiny stoneflies were among the only species of aquatic insect adults in the air on this particular afternoon, with most of the action coming from a species of Epeorus mayfly. I somehow forgot to photograph this one on the usual ruler, but I recall it was very, very small, with an abdomen no more than 1mm in girth and the body, not counting the wings, probably just 5-7mm long.

Ventral view of a Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York
Dorsal view of a Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York
Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York
Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York
Lateral view of a Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York
Female Amphinemura (Nemouridae) (Tiny Winter Black) Stonefly Adult from Mystery Creek #23 in New York

This stonefly was collected from Mystery Creek #23 in New York on September 6th, 2006 and added to Troutnut.com by Troutnut on October 3rd, 2006.

Discussions of this Adult

Small stonefly photos
9 replies
Posted by JaneBug on Jan 25, 2007
Last reply on Jan 28, 2007 by DMM
The stonefly in this series of photos is not a Capniidae. It is a Nemouridae, a female Amphinemura. The yellow abdomen has eggs inside. Message from a stonefly researcher from Pennsylvania.

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Female Amphinemura (Tiny Winter Black) Stonefly Adult Pictures

Collection details
Location: Mystery Creek #23, New York
Date: September 6th, 2006
Added to site: October 3rd, 2006
Author: Troutnut
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