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The Specimen

Eurylophella (Chocolate Duns) Mayfly SpinnerEurylophella (Chocolate Duns) Mayfly Spinner View 12 Pictures
Collected June 3, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by on May 24, 2006

The Discussion

Post Reply
GONZOMay 24th, 2009, 3:00 pm
Site Editor
"Bear Swamp," PA

Posts: 1681		This spinner is Eurylophella rather than E. invaria. The long 9th abdominal segment of Eurylophella is often the easiest way to avoid confusing the duns and spinners with Ephemerella. The claspers and genitalia of this male are also representative of Eurylophella.

WiflyfisherMay 24th, 2009, 7:05 pm
Wisconsin

Posts: 647		Lloyd, what the heck is Eurylophella???
John S.
https://WiFlyFisher.com
GONZOMay 24th, 2009, 8:18 pm
Site Editor
"Bear Swamp," PA

Posts: 1681		John,

Eurylophella species comprised the "bicolor" group of Ephemerella until Allen elevated subgenera (like Drunella, Serratella, Attenella, etc.) in 1980. Although widespread and fairly common, they are infrequently mentioned in fly-fishing literature. In streams and rivers, Eurylophella nymphs usually inhabit slow, weedy water, but some are also found in lakes. Most Eastern/Midwestern species seem to emerge sometime in June/July. The dark-winged duns can also be mistaken for other species, like Ephemerella needhami.

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