Remarks
Doganlar (1979) appears to have replaced this with Swammerdamia beirnei based on slight differences is wing pattern and genitalia. BOLD barcodes do not appear to distinguish between North American samples of beirnei and pyrella. It seems that either the species currently treated here as pyrella should include as a synonym beirnei or it should be changed to beirnei.
See Also
Other species in both Swammerdamia and Paraswammerdamia. It may be that dissection is required to separate them to species.
Print References
Doganlar, M. 1979. A new species of Swammerdamia HBN. (Lepidoptera: Yponomeutidae) from British Columbia.
The Canadian Entomologist. 111(8):
967
Duckworth, D. 1965. North American Moths of the Genus Swammerdamia (Lepidoptera: Yponomeutidae).
Proceedings of the United States National Museum. 116:
549-555.
Hübner, J. 1825. Verzeichniss bekannter Schmettlinge. p.
425