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Landscape & scenery photos from the Foss River

Page:123
 From the Foss River in Washington.
LocationFoss River
Date TakenSep 10, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Foss River in Washington.
LocationFoss River
Date TakenSep 10, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Foss River in Washington.
LocationFoss River
Date TakenSep 10, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Foss River in Washington.
LocationFoss River
Date TakenSep 10, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Foss River in Washington.
LocationFoss River
Date TakenSep 10, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
Page:123

Closeup insects from the Foss River

Male Perlidae (Golden Stones) Stonefly AdultMale Perlidae (Golden Stones) Stonefly Adult View 15 PicturesI found this stonefly on some streamside vegetation. I didn't see any in the air in several hours of fishing.
Collected September 10, 2020 from the Foss River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020
Ephemerella aurivillii Mayfly NymphEphemerella aurivillii  Mayfly Nymph View 11 PicturesThis is a puzzling one to identify and I'm not sure about the species. The maxillary palp (
The palp on the maxilla of an Ephemerella nymph (detached and photographed under a microscope) is highlighted in red here.
The palp on the maxilla of an Ephemerella nymph (detached and photographed under a microscope) is highlighted in red here.
Palp: A long, thin, often segmented appendage which can protrude from certain insect mouth parts such as the maxillae. Also known as the < />palpus.
)
is present and segmented, and the maxillary canines are not strongly serrate laterally. I think it's Ephemerella, not Serratella. The ventral (Ventral: Toward or on the bottom.) lamellae of the gills on abdominal segment 6 have a clear median notch with a depth at least half the length of the lamellae, which points toward a couple of uncommon species (most likely Ephemerella alleni), but the abdominal tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled.  They are especially large in this species.
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.
)
and coloration don't fit that species. To add to the confusion, none of the above species are expected to emerge in the fall, as far as I know. I'm going to call this one Ephemerella aurivillii for now, but that's highly uncertain.
Collected September 10, 2020 from the Foss River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020

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