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The Specimen

The Discussion

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

Posts: 612
Lloyd, what the heck is Eurylophella???
John S.
GONZOMay 24th, 2009, 8:18 pm
Site Editor
"Bear Swamp," PA

Posts: 1681

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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