Updates from May 27, 2004

Mayflies

Caddisflies

Stoneflies

Closeup insects by Troutnut from Miscellaneous Wisconsin in Wisconsin

Male Ephemerella invaria (Sulphur Dun) Mayfly Spinner

View 3 PicturesI caught this one as a dun and he molted into a spinner in my room.

Collected May 27, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

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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.

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.