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Insect Order Plecoptera (Stoneflies)



Pictures Below ↓

This is page 9 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...8910...16
Female Hesperoperla pacifica (Golden Stone) Stonefly AdultFemale Hesperoperla pacifica (Golden Stone) Stonefly Adult View 1 PicturesFly fishermen refer to this stonefly as one of "golden stones".
Collected November 30, 1999 from the Grande Rhonde River in Washington
Added to Troutnut.com by Bnewell on June 26, 2011
Male Calineuria californica (Golden Stone) Stonefly AdultMale Calineuria californica (Golden Stone) Stonefly Adult View 15 PicturesA few of these larger stoneflies were fluttering around the South Fork on an evening dominated by much smaller species.

This one has been difficult to identify. I can't spot any of the gill remnants characteristic of Perlidae, but the wing venation (Venation: The pattern in which the veins on the wings of an insect are arranged. It is usually one of the most useful identifying characteristics.) seems to point in that direction. I tried keying it out as Perlodidae but arrived at Isoperla, every western species of which has significantly smaller bodies than this one.

Edit: See forum comments for a likely correct identification.
Collected July 20, 2019 from the South Fork Snoqualmie River in Washington
Added to Troutnut.com by Troutnut on July 22, 2019
Female Sweltsa fidelis (Sallfly) Stonefly AdultFemale Sweltsa fidelis (Sallfly) Stonefly Adult View 5 PicturesIn Baumann's Stoneflies of the Rocky Mountains, this specimen keys to Sweltsa fidelis, but the number of species in that key is fairly small and it might not be accurate.

Collected June 30, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 17, 2019
Suwallia pallidula (Sallfly) Stonefly AdultSuwallia pallidula (Sallfly) Stonefly Adult View 2 Pictures
Collected July 1, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on July 1, 2011
Isocapnia integra (Little Snowfly) Stonefly NymphIsocapnia integra (Little Snowfly) Stonefly Nymph View 1 Pictures
Collected December 19, 2009 from the Flathead River-upper in Montana
Added to Troutnut.com by Bnewell on June 26, 2011
Pteronarcys californica (Giant Salmonfly) Stonefly NymphPteronarcys californica (Giant Salmonfly) Stonefly Nymph View 9 Pictures
Collected July 2, 2019 from the Gallatin River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
Sweltsa fidelis (Sallfly) Stonefly AdultSweltsa fidelis (Sallfly) Stonefly Adult View 2 Pictures
Collected July 14, 2011 from Swamp Creek in Oregon
Added to Troutnut.com by Bnewell on July 14, 2011
Utacapnia distincta (Little Snowfly) Stonefly NymphUtacapnia distincta (Little Snowfly) Stonefly Nymph View 1 Pictures
Collected February 1, 2007 from Crazy Beaver Spring in Montana
Added to Troutnut.com by Bnewell on June 26, 2011
Kogotus nonus Stonefly NymphKogotus nonus Stonefly Nymph View 10 Pictures
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Pteronarcys californica (Giant Salmonfly) Stonefly NymphPteronarcys californica (Giant Salmonfly) Stonefly Nymph View 2 PicturesHere are two size classes of Pteronarcys nymphs. These probably represent two different generations. The largest will probably emerge next spring and the other in two years. There is probably another generation, smaller, I did not collect. In a Canadian study they discovered Pteronarcys eggs do not all hatch simultaneously but hatch for a period of nearly two years, making their egg/nymphal life 5 years. The other photo is of a curled nymph, a typical response to disturbance.
Collected August 10, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on August 10, 2011
Specimen Page:1...8910...16
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