Hymenolepis nana – Egg (40 µm to 50 µm long) in stools

This egg is elliptic, and contains a 6-hooked onchosphere. The outer shell (from 40 µm to 50 µm long) is hyaline, smooth and thin. The inner shell (from 20 µm to 30 µm long) is separated from outer envelope by a clear area. It displays 2 polar thickenings, which 4 to 5 threadlike cords (chalazas) arise from.