Date of this Version
Taxonomic Report of the International Lepidoptera Survey (October 4, 2021) 9(6): 1-6
Also available at https://lepsurvey.carolinanature.com/ttr/ttr-9-6.pdf
Also available at the Internet Archive and the Biodiversity Heritage Library
The egg of the Bog Copper butterfly, Tharsalea (Epidemia) epixanthe, has a prominent highly-sculptured chorionic surface. Trapped within the chorion is a labyrinth of air spaces which has been proposed as a plastron for gas exchange while the egg is submerged in water. Data derived from scanning electron microscopy (SEM) confirms the plastron should function as predicted. Furthermore, the insulating air spaces should prevent water loss of the diapausing first instar larvae while overwintering.