None of the species in this genus are recognized as significant hatches. Nevertheless, I have found their nymphs in my samples in many streams in both the East and Midwest. Where & When
» Genus Eurylophella (Chocolate Duns)
10 species aren't included.
Regions:This genus is widespread throughout the East and Midwest but rarely abundant. The few species for which emergence dates are available all emerge in May and June.Nymph Biology
East, MidwestTime Of Year (?):
May and June
Current Speed: SlowThese nymphs probably inhabit slow water where the bottom is covered with silt or detritus (Detritus: Small, loose pieces of decaying organic matter underwater.). The operculate (
Operculate: Lidlike; usually used to describe the pair of enlarged elytroid gills (called the operculum) which some silt-dwelling mayfly nymphs like Caenis and Eurylophella have developed to shield their other gills from debris.) gills they possess are a common adaptation evolved by mayflies in such environments.
The operculate gills of a Caenis
Pictures of 22 Mayfly Specimens in the Genus Eurylophella:
Eurylophella (Chocolate Duns) Mayfly Nymph
View 5 PicturesThis nymph is an extremely early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.).
Recent Discussions of Eurylophella
florida mayfly nymph imitations 2 Replies »
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.Reply
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