Notes on the effect of temperature on egg development of Leucorrhinia glacialis Hagen (Anisoptera: Libellulidae)

Under laboratory conditions, no hatching took place at temperatures below I7.5°C. The duration of embryonic development, at different experimental temperatures, varied from 36.48 to 7.20 days. Egg mortality was lowest between 22.5 and 27.5° C, and increased rapidly at temperatures above 30° C. These observations are compared with the evidence on L. rubicunda and L. intacta.