Updates from May 23, 2007

Mayflies

Caddisflies

Stoneflies

Closeup insects by Troutnut from Miscellaneous New York, the Little Juniata River, and the Neversink River in New York and Pennsylvania

Female Acroneuria lycorias (Golden Stone) Stonefly Adult

View 17 Pictures

Collected May 23, 2007 from Aquarium (collected somewhere in Catskills) in New York
Added to Troutnut.com by Troutnut on June 4, 2007

Female Maccaffertium ithaca (Light Cahill) Mayfly Dun

View 10 PicturesThis female looks very much like a male I collected a few hundred miles away a few days later, so I'm guessing it's the same species, which I believe is Maccaffertium mediopunctatum.

Collected May 23, 2007 from the Little Juniata River in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007

Female Baetisca obesa (Armored Mayfly) Mayfly Dun

View 12 PicturesThis Baetisca obesa dun hatched out in my aquarium from nymphs collected a couple weeks earlier.

Collected May 23, 2007 from the Neversink River (aquarium-raised) in New York
Added to Troutnut.com by Troutnut on June 4, 2007

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Jargon Defined:

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).