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.

Neversink Gorge (Wolf Brook) in New York

Stream photos

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Zapada cinctipes (Tiny Winter Black) Stonefly Nymph Zapada cinctipes (Tiny Winter Black) Stonefly Nymph

Dorsal view of a Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington

Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.

13 Recently Added Photos

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 Drunella tuberculata Mayfly Dun Pictures

I don't know for sure that this is Drunella tuberculata, but that's my best guess for now.

It certainly has a different look and much more robust body shape from Drunella lata duns I photographed a couple weeks earlier, so I doubt it's that species. Using distribution records to eliminate other choices narrows this down to Drunella tuberculata or Drunella walkeri.

Markings described for the abdominal sternites of the male spinner of Drunella tuberculata are suspiciously similar to those on this female dun. Also, this dun is 9.5mm long (my ruler pic isn't very good, but I'm basing this on measuring the real thing). The size range given in the old Allen & Edmunds keys for walkeri females is 7-8mm, while tuberculata is 9-11mm. For these reasons I'm sticking it in tuberculata for now.

This is the only Drunella mayfly I saw all day. I scooped it off the water as it emerged at around 7pm from a big Catskill tailwater.

Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Ventral view of a Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Dorsal view of a Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Lateral view of a Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

The projection under the right eye of this one is interesting.

Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York

Ruler view of a Female Drunella tuberculata (Ephemerellidae) Mayfly Dun from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.

This mayfly was collected from the West Branch of the Delaware River in New York on June 7th, 2007 and added to Troutnut.com by Troutnut on June 8th, 2007.

Discussions of this Dun

Insect migration

7 replies

Posted by Mykisslayer on Jan 30, 2014

Last reply on Feb 3, 2014 by PaulRoberts

Do adult aquatic insects travel or migrate to other watersheds or bodies of water? Or do they remain close to the area where they emerged?

Anyone recognize this Drunella?

8 replies

Posted by Troutnut on Jun 8, 2007

Last reply on Sep 21, 2009 by GONZO

I'm a bit puzzled about this one. See the specimen description for details. I know female duns are awful for identification, but this is the only one of its species I could find. Would any of you Ephemerellid experts (Konchu!!) care to take a guess?

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References

Baumann, Richard W. 1975. Revision of the Stonefly Family Nemouridae (plecoptera) : a Study Of The World Fauna At The Generic Level. Smithsonian Contributions to Zoology undef(211): 1-74.