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Animal Phylum Arthropoda (Arthropods)

Pictures Below ↓

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

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

Pictures of 1137 Arthropod Specimens:

Specimen Page:1234...115
Isogenoides hansoni (Appalachian Springfly) Stonefly NymphIsogenoides hansoni (Appalachian Springfly) Stonefly Nymph View 11 PicturesThis large Perlodidae stonefly was a strikingly bright yellow color, more so than any other insect I've seen. I didn't enhance it much. See the discussion threads to follow how we identified this specimen, which was listed incorrectly for several years.
Collected April 19, 2006 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on April 21, 2006
Male Ephemerella subvaria (Hendrickson) Mayfly DunMale Ephemerella subvaria (Hendrickson) Mayfly Dun View 9 PicturesI collected this male Hendrickson dun and a female in the pool on the Beaverkill where the popular Hendrickson pattern was first created. He is descended from mayfly royalty.
Collected April 19, 2006 from the Beaverkill River in New York
Added to Troutnut.com by Troutnut on April 22, 2006
Belostoma flumineum (Electric Light Bug) Giant Water Bug AdultBelostoma flumineum (Electric Light Bug) Giant Water Bug Adult View 13 PicturesI'm glad I finally got one of these Belostoma water bugs under my good camera. I had been hoping to get one in my kick-net samples for a while with no luck, but I ended up finding this one drifting midstream just below the surface while I fished. I have frequently seen water scorpions do that, too, and I'm beginning to suspect that is a common situation travel for these large Hemiptera bugs, and perhaps the way trout are used to seeing them.
Collected April 24, 2007 from the West Branch of Owego Creek in New York
Added to Troutnut.com by Troutnut on April 24, 2007
Female Maccaffertium (March Browns and Cahills) Mayfly AdultFemale Maccaffertium (March Browns and Cahills) Mayfly Adult View 13 Pictures
Collected May 26, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 16, 2006
Male Ephemerella aurivillii Mayfly SpinnerMale Ephemerella aurivillii Mayfly Spinner View 15 PicturesThis spinner molted from a dun after being photographed, and the dun form is listed here as a separate specimen. I've rarely found a more cooperative and photogenic mayfly.
Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 16, 2011
Nigronia serricornis (Fishfly) Hellgrammite LarvaNigronia serricornis (Fishfly) Hellgrammite Larva View 13 Pictures
Collected April 24, 2007 from Factory Brook in New York
Added to Troutnut.com by Troutnut on April 24, 2007
Baetis (Blue-Winged Olives) Mayfly NymphBaetis (Blue-Winged Olives) Mayfly Nymph View 10 Pictures
Collected May 6, 2007 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on May 18, 2007
Nigronia serricornis (Fishfly) Hellgrammite LarvaNigronia serricornis (Fishfly) Hellgrammite Larva View 12 Pictures
Collected March 29, 2006 from Salmon Creek in New York
Added to Troutnut.com by Troutnut on April 7, 2006
Male Stictochironomus Midge AdultMale Stictochironomus Midge Adult View 11 PicturesThis midge and several like it, including a female I also photographed, hatched from larvae which were living in some fine mud I'm using as substrate in my bug-rearing aquarium.
Collected April 10, 2007 from Mystery Creek #62 in New York
Added to Troutnut.com by Troutnut on April 10, 2007
Female Drunella tuberculata Mayfly DunFemale Drunella tuberculata Mayfly Dun View 14 PicturesI don't know for sure that this is Drunella tuberculata, but that's my best guess for now.

It certainly has a different look and much more robust body shape from Drunella lata duns I photographed a couple weeks earlier, so I doubt it's that species. Using distribution records to eliminate other choices narrows this down to Drunella tuberculata or Drunella walkeri.

Markings described for the abdominal sternites (
One sternite of this Isonychia bicolor mayfly spinner is highlighted in red.
One sternite of this Isonychia bicolor mayfly spinner is highlighted in red.
Sternite: The bottom (ventral) part of a single segment on an insect's abdomen.) of the male spinner of Drunella tuberculata are suspiciously similar to those on this female dun. Also, this dun is 9.5mm long (my ruler pic isn't very good, but I'm basing this on measuring the real thing). The size range given in the old Allen & Edmunds keys for walkeri females is 7-8mm, while tuberculata is 9-11mm. For these reasons I'm sticking it in tuberculata for now.

This is the only Drunella mayfly I saw all day. I scooped it off the water as it emerged at around 7pm from a big Catskill tailwater.
Collected June 1, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on June 8, 2007
Specimen Page:1234...115
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