Medium Olive Duns
This common name refers to only one species.
Mayfly Species Acerpenna pygmaea
These are very rarely called Medium Olive Duns.
This species is known in older under the former name Baetis pygmaeus. I have found no mention of fishable hatches, but it seems to be regarded as a common species.
Female Acerpenna pygmaea (Blue-Winged Olive) Mayfly Dun
View 4 PicturesI'm guessing this specimen is in the genus Acerpenna because of the very sharp costal process (
Costal process: A bump or point sticking up from the front margin of an insect's wing, usually the rear wing of certain mayflies. It is sometimes called a costal projection.) on her hind wing. I'm guessing pygmaea because it is the most common species.
View 4 PicturesI'm guessing this specimen is in the genus Acerpenna because of the very sharp costal process (The costal process of a Baetidae dun.
Region: Upper Midwest
Collected Jul 1, 2005
Added Apr 22, 2006
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