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[Hymenolepis nana] [H. diminuta]

Egg of Hymenolepis nana.  These eggs are oval and smaller than those of H. diminuta, their size being 40 to 60 µm by 30 to 50 µm.  On the inner membrane are two poles, from which 4 to 8 polar filaments spread out between the two membranes.  The oncosphere has six hooks (seen as dark lines at 8 o'clock).  Image contributed by Georgia Department of Public Health.