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Mayfly Species Acerpenna pygmaea (Tiny Blue-Winged Olive)

Pictures Below
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.

Pictures of 1 Mayfly Specimen in the Species Acerpenna pygmaea:

Acerpenna pygmaea (Tiny Blue-Winged Olive) Mayfly NymphAcerpenna pygmaea (Tiny Blue-Winged Olive) Mayfly Nymph View 3 PicturesThis is a very rare mayfly in western Montana. The shape of the last gill is a key to its identification. I have collected this species in only one location.
Collected May 5, 2007 from the Upper Stillwater River in Montana
Added to by Bnewell on June 26, 2011

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