Acerpenna
Waltz & McCafferty, 1987
Blue-Winged Olive
Species Guides
2- Acerpenna macdunnoughi(small minnow mayfly)
- Acerpenna pygmaea(tiny blue-winged olive)
Acerpenna is a of small minnow mayflies in the Baetidae, established by Waltz & McCafferty in 1987. The genus includes at least three , with Acerpenna pygmaea (Blue-Winged Olive) being the most widely known. These mayflies are significant in aquatic and highly valued in fly fishing.
Pronunciation
How to pronounce Acerpenna: /ˌæsərˈpɛnə/
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Identification
Distinguished from other Baetidae by specific morphological features established in the original generic description; -level identification requires examination of genitalia and wing venation. A. pygmaea is recognizable by its blue-gray wings and small size among mayflies.
Images
Habitat
Coldwater rivers and streams, typical of Baetidae .
Distribution
North America; occur in rivers where they serve as important trout food sources. Less commonly referenced in Great Britain.
Diet
Larval stages feed on detritus and periphyton in aquatic environments.
Life Cycle
Mayflies undergo with , nymph (larval), subimago (dun), and () stages. Specific timing for Acerpenna is not well documented.
Behavior
are short-lived, emerging to mate in swarms. Nymphs are agile swimmers in flowing water.
Ecological Role
Important primary consumers in aquatic ; serve as critical prey for trout and other fish in coldwater .
Human Relevance
A. pygmaea (Blue-Winged Olive) is one of the most replicated patterns in fly fishing, considered among the most popular dry flies in the United States alongside the Adams dry fly. Artificial patterns mimic their appearance to catch trout and other .
Similar Taxa
- Other Baetidae generaShare -level characteristics of small minnow mayflies; require detailed morphological examination for differentiation.
- CallibaetisAnother Baetidae with similar preferences; distinguished by wing pattern and body proportions.
More Details
Taxonomic History
established by Waltz & McCafferty in 1987, reorganizing previously placed in other genera.
Species Diversity
At least three recognized : A. akataleptos (McDunnough, 1926), A. pygmaea (Hagen, 1861), and A. macdunnoughi (Ide, 1937).