ID#: 24128
Caption:
This illustration highlights some of the comparative ultrastructural morphology exhibited by a dwarf tapeworm, Hymenolepis nana ovum on the left, and a rat tapeworm, H. diminuta ovum. H. nana eggs are oval and smaller than those of H. diminuta, with a size range of 30 - 50µm. On the inner membrane are two poles, from which 4-8 polar filaments spread out between the two membranes. The oncosphere has six hooks. H. diminuta eggs are round, or slightly oval, with a size range of 70 – 85µm X 60 – 80µm, with a striated outer membrane and a thin inner membrane. The space between the membranes is smooth or faintly granular. The oncosphere has six hooks. Unlike H. nana, there are no polar filaments extending into the space between the oncosphere and the outer shell.
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Content Provider(s): CDC/ Fleisher
Creation Date: 1963
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