Rodentolepis nana, commonly known as the dwarf tapeworm, produces oval-shaped eggs with inner and outer membranes. The inner membrane has 2 poles (arrows) from which 4 to 8 polar filaments arise and spread out between the membranes. Within the inner membrane is the embryo (onchosphere) that contains 6 hooks. The eggs are smaller than the eggs of Hymenolepis diminuta, measuring 30 to 50 micrometers in greatest dimension.