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Stonefly Family Perlodidae (Springflies and Yellow Stones)

Taxonomic Navigation -?-
» Family Perlodidae (Springflies and Yellow Stones)
Genus in PerlodidaeNumber of SpecimensNumber of Pictures
IsoperlaStripetails and Yellow Stones1147
SkwalaLarge Springflies35

20 genera aren't included.
Common Names
Pictures Below

This is page 3 of specimens of Perlodidae. Visit the main Perlodidae page for:

  • The behavior and habitat of Perlodidae.

Pictures of 27 Stonefly Specimens in the Family Perlodidae:

Specimen Page:1234
Osobenus yakimae Stonefly NymphOsobenus yakimae  Stonefly Nymph View 6 PicturesThis nymph keys out to Osobenus yakimae, and a comparison of the markings with a specimen on ( provides a good verification.
Collected June 13, 2019 from the South Fork Snoqualmie River in Washington
Added to by Troutnut on June 14, 2019
Kogotus nonus Stonefly NymphKogotus nonus  Stonefly Nymph View 9 PicturesAlthough Kogotus and Rickeri nymphs may be difficult or impossible to tell apart, I captured an adult Kogotus nonus specimen in the air on the same day as several of these nymphs, and they are likely the same species.
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to by Troutnut on July 30, 2019
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 by Troutnut on September 19, 2020
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: (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 by Troutnut on July 3, 2018
Isoperla fusca (Yellow Sally) Stonefly NymphIsoperla fusca (Yellow Sally) Stonefly Nymph View 12 PicturesThis specimen keys to Isoperla fusca using the key in Szczytko & Stewart 1979, but some species of Isoperla weren't represented there.
Collected April 9, 2021 from the Yakima River in Washington
Added to by Troutnut on April 12, 2021
Isoperla fulva (Yellow Sally) Stonefly AdultIsoperla fulva (Yellow Sally) Stonefly Adult View 4 PicturesAn adult stonefly carrying a load of red mites.
Collected May 31, 2011 from the Touchet River in Washington
Added to by Bnewell on June 27, 2011
Isoperla quinquepunctata (Little Yellow Stonefly) Little Yellow Stonefly NymphIsoperla quinquepunctata (Little Yellow Stonefly) Stonefly Nymph View 2 PicturesSize - (excluding tails) - 10 mm
Status at time of photo - preserved but no discernible color change as specimen was captured only a few days earlier.
Key characters - unique pattern on dorsal (Dorsal: Top.) head and thorax (Thorax: The thorax is the middle part of an insect's body, in between the abdomen and the head, and to which the legs and wings are attached.); dark medial (Medial: Toward the middle of the body.) terga (Tergum: the dorsal part of an abdominal segment or segments (terga). Also used to describe the entire abdominal dorsum or the thoracic dorsal segments of Odonata.) stripe between two paler stripes

This species is very common in west slope north Sierra watersheds. Richard W. Baumann & Boris C. Kondratieff did a study on the same section and at the same time of year (APRIL 25-29, 2010) where this specimen was taken. No other species of Isoperla were reported from this location and quinquepunctata was very abundant. Their hatches can be very heavy some Springs.

Collected March 21, 2011 from the Lower Yuba River in California
Added to by Entoman on November 1, 2011
Male Isoperla fulva (Yellow Sally) Stonefly AdultMale Isoperla fulva (Yellow Sally) Stonefly Adult View 2 PicturesThese Isoperla are loaded with red parasitic mites.
Collected June 6, 2011 from the Touchet River in Washington
Added to by Bnewell on June 26, 2011
Specimen Page:1234
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