A preliminary report of egg chorion features in dragonflies (Anisoptera)

Scanning electron microscopy was used to examine surface chorionic features in selected odon. spp. Aphylla williamsoni (Gloyd) and Gomphus exilis Sel. (Gomphidae) have thick-shelled, elaborately sculptured eggs which exhibit multiple micropyles on a micropylar stalk. Several libellulid spp. display simply sculptured, thin-shelled eggs which have an apical disc surmounted by an extrachorionic nippledike structure. Anax junius (Dru.) (Aeshnidae) eggs are elongate, smooth, and have an apical whorl of 6 micropyles surrounding a short stalk.