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Mayfly Species Acerpenna pygmaea (Tiny Blue-Winged Olive)

This species is known in older taxonomies under the former name Baetis pygmaeus.
It is a diminutive baetid with distribution across every region. It is reported to have localized hatches of occasional importance.

Where & When

Regions: East, Midwest, West

Time Of Year (?): Early August through mid-September

Nymph Biology

Current Speed: Slow

Substrate: Vegetation

The nymphs may inhabit freestone streams, but they avoid the faster currents.

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