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Insect Order Plecoptera (Stoneflies)



Pictures Below

This is page 13 of specimens of Plecoptera. Visit the main Plecoptera page for:

  • The behavior and habitat of Plecoptera.
  • 6 underwater pictures of Plecoptera.

Pictures of 151 Stonefly Specimens:

Specimen Page:1...121314...16
Pteronarcys californica (Giant Salmonfly) Stonefly NymphPteronarcys californica (Giant Salmonfly) Stonefly Nymph View 5 PicturesThis salmonfly nymph is probably not quite fully grown, as it still has a couple months yet to emerge.
Collected April 9, 2021 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on April 12, 2021
Female Strophopteryx fasciata (Mottled Willowfly) Stonefly AdultFemale Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult View 5 PicturesSeveral stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.
Collected March 16, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Female Isoperla fusca (Yellow Sally) Stonefly AdultFemale Isoperla fusca (Yellow Sally) Stonefly Adult View 13 PicturesThe family ID on this one was a little bit tricky. Just going by the size, shape, and color, it looks like Chloroperlidae. However, the second anal vein of the forewing is does not appear to be forked, and the apical (Apical: Close to the apex; tip or end.) maxillary palpal segment is close to the length of the penultimate segment, both of which rule out that family. The position of the cubitoanal crossvein (Crossvein: Short cross-wise veins in an insect wing which connect the long longitudinal (length-wise) veins.) relative to the anal cell in the forewing -- touching it in this case -- indicates Perlidae (and it really doesn't have the "look" of Perlidae at all), but other characteristics, such as the metathorastic sternacostal sutures and lack of gill remnants, point to Perlodidae. That's the right answer. Moving on to Perlodidae, the key characteristics in Merritt & Cummins lead straightforwarly to Isoperla, and the species key in Jewett 1959 (The Stoneflies of the Pacific Northwest) leads to Isoperla fusca.

There is one caveat: That source does suggest a May-July emergence, whereas this one was collected in mid-September.
Collected September 17, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020
Female Suwallia pallidula (Sallfly) Stonefly AdultFemale Suwallia pallidula (Sallfly) Stonefly Adult View 9 PicturesI collected a few of these throughout the afternoon. The positive ID on the adults allowed me to also put a species ID on the nymphs.
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 29, 2019
Chloroperlidae (Sallflies) Stonefly NymphChloroperlidae (Sallflies) Stonefly Nymph View 7 Pictures
Collected May 10, 2008 from the Chena River in Alaska
Added to Troutnut.com by Troutnut on April 20, 2011
Female Pictetiella expansa Stonefly AdultFemale Pictetiella expansa  Stonefly Adult View 12 PicturesBased on photos, this specimen seems to key out (using Merritt & Cummins 4th Edition) to Pictetiella expansa, but some of the characteristics aren't 100 % clear. However, that species is listed as occurring near Puget Sound and the head markings are similar to (albeit not a perfect match for) those of a male from Colorado in the scientific literature here: https://www.researchgate.net/figure/Head-and-pronotum (Pronotum: The top of the insect prothorax.)-dorsal (Dorsal: Top.)-Pictetiella-expansa-Boulder-Co-Colorado-North-Fork-Middle_fig1_315373449
Collected June 16, 2018 from the South Fork Snoqualmie River in Washington
Added to Troutnut.com by Troutnut on July 3, 2018
Female Suwallia pallidula (Sallfly) Stonefly AdultFemale Suwallia pallidula (Sallfly) Stonefly Adult View 12 PicturesA large number of photos from the microscope allowed a fairly confident ID on this one, which not coincidentally matches very well a previous specimen of Suwallia pallidula that I collected in Washington.
Collected August 1, 2020 from Mystery Creek #237 in Montana
Added to Troutnut.com by Troutnut on August 18, 2020
Male Chloroperlidae (Sallflies) Stonefly AdultMale Chloroperlidae (Sallflies) Stonefly Adult View 4 PicturesThis specimen unfortunately was blown away by the wind mid-way through the photographs, so I wasn't able to preserve it for an ID or get some of the other angles.
Collected August 4, 2020 from Green Lake Outlet in Idaho
Added to Troutnut.com by Troutnut on August 19, 2020
Specimen Page:1...121314...16
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