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Mayfly Species Dannella simplex (Blue-Winged Olive)

Although by no means a superhatch, this species can be important. Authors who discuss it lament the general lack of credit it receives for the fine hatches it produces on some streams.  

Where & When


Regions: East, Midwest

Time Of Year (?): June through mid-September, but best in June and July


Hatching Behavior


Time Of Day (?): Morning


Spinner Behavior


Spinner falls are sparse and unimportant.

Nymph Biology


Current Speed: Slow

Substrate: Silt

These nymphs have operculate (
The operculate gills of a Caenis nymph.
The operculate gills of a Caenis nymph.
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 on segment four. This adaptation protects their other gills from the loose silt covering the bottom in the slow backwaters and pools they prefer.

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