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Animal Phylum Arthropoda (Arthropods)



Pictures Below ↓

This is page 117 of specimens of Arthropoda. Visit the main Arthropoda page for:

  • The behavior and habitat of Arthropoda.
  • 122 underwater pictures of Arthropoda.

Pictures of 1243 Arthropod Specimens:

Specimen Page:1...116117118...125
Attenella margarita (Little Western Blue-Winged Olive) Mayfly NymphAttenella margarita (Little Western Blue-Winged Olive) Mayfly Nymph View 7 PicturesNotes from the microscope on the ID: 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, distinctly 2-segmented, but very small. Gills on segment 4-7. This specimen has some unfortunate damage to the abdomen, but it's the only one I found in my sample.
Collected August 3, 2020 from the East Fork Big Lost River in Idaho
Added to Troutnut.com by Troutnut on August 19, 2020
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 2 PicturesIt has the segment 4 gill and abdominal segment 9 is longer than segment 8. I couldn't see 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.), but they may not yet be developed in such an early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.).
Collected March 10, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 19, 2006
Female Epeorus albertae (Pink Lady) Mayfly SpinnerFemale Epeorus albertae (Pink Lady) Mayfly Spinner View 1 PicturesIt is hard to see where the name "Pink Lady" comes from.
Collected June 29, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on June 29, 2011
Claassenia sabulosa (Golden Stone) Stonefly AdultClaassenia sabulosa (Golden Stone) Stonefly Adult View 2 PicturesThese are photos of the nymphal exuvia a sure sign that emergence is in progress, especially when you see these at the water's edge.
Collected May 24, 2007 from the Flathead River-lower in Montana
Added to Troutnut.com by Bnewell on July 1, 2011
Male Skwala (Large Springflies) Stonefly AdultMale Skwala (Large Springflies) Stonefly Adult View 1 Pictures
Collected May 9, 2005 from the Jocko River in Montana
Added to Troutnut.com by Bnewell on July 3, 2011
Hydropsychidae Caddisfly AdultHydropsychidae Caddisfly Adult View 2 PicturesThese specimens are either Cheumatopsyche or Hydropsyche. They escaped before I could catch them.I suspect, based on size, they are Hydropsyche, they are about 1/4 inch in length. Both H. occidentalis and H. californica are common in the Touchet River.
Collected July 27, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on July 29, 2011
Female Paraleptophlebia bicornuta (Mahogany Dun) Mayfly SpinnerFemale Paraleptophlebia bicornuta (Mahogany Dun) Mayfly Spinner View 1 Pictures
Collected October 3, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on October 3, 2011
Paraleuctra occidentalis (Tiny Winter Black) Stonefly AdultParaleuctra occidentalis (Tiny Winter Black) Stonefly Adult View 1 PicturesMembers of the family Leuctridae are usually easily identified to family due to the "rolled" wing. They are small, nearly 1/4 " in length, black in color and emerge in early spring.
Collected March 7, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on March 20, 2012
Male Paraleptophlebia (Blue Quills and Mahogany Duns) Mayfly DunMale Paraleptophlebia (Blue Quills and Mahogany Duns) Mayfly Dun View 7 Pictures
Collected August 11, 2018 from the Big Hole River in Montana
Added to Troutnut.com by Troutnut on June 11, 2019
Male Lepidostoma (Little Brown Sedges) Little Brown Sedge AdultMale Lepidostoma (Little Brown Sedges) Little Brown Sedge Adult View 4 Pictures
Collected August 11, 2018 from the Henry's Fork of the Snake River in Idaho
Added to Troutnut.com by Troutnut on June 12, 2019
Specimen Page:1...116117118...125
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