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Mayfly Species Eurylophella temporalis (Chocolate Dun)

  

Where & When


Regions: East, Midwest

Time Of Year (?): Mid-May through early June, perhaps later

Preferred Waters: Lakes and large streams

This widespread Eastern and Midwestern species is not really mentioned in fly fishing literature. The Leonards say in Mayflies of Michigan Trout Streams that it is found in lakes and small streams, though the specimens I collected in northern Wisconsin came from the very small headwaters of a small stream.

Since I have collected the nymphs in early June without the darkened wing pads (
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
Wing pad: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.
)
that would indicate an impending hatch, I assume they emerge later than the dates I've found in books.

Recent Discussions of Eurylophella temporalis

florida mayfly nymph imitations 2 Replies »
Posted by Homer47 on Sep 5, 2012
Last reply on Sep 6, 2012 by Sayfu
Looks like an imitation would be about a #10 or #8 dark brown nymph pattern. I'm down here in north Fla and trying to match the hatch in the far north central part of the state, mostly to fool the bream. Any ideas or help would be appreciated. I found two patterns so far that seem to work- a little brown nymph with a rusty brown/orange thorax(maybe this is a good representation of the E. Temporalis), and a size 12 buzzer nymph with black body, peacock thorax and white breathing filament. The bream seemed to agree with that choice. I would like to try and copy more local insects as I figure out what they are.There are dragonflies and damselflies and mosquitoes. I could start there.
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