Introduction to Diagnostic Medical Parasitology
Hymenolepis nana
Egg
![](/.imaging/mte/default-theme/parasiteImage/dam/parasites/helminths/cestodes/intestinal-cestodes/hymenolepis-nana/Hanan-cartoon.png0/jcr:content/Hanan%20cartoon.png)
Egg; spheroidal; pale; thin shelled; oncosphere surrounded by rigid membrane; two polar thickenings from which 4-8 filaments extend into the space between the oncosphere and thin outer shell
Size: 30 - 45 μm
A Shell
B Membrane
C Filaments
D Oncosphere
Worm
![](/.imaging/mte/default-theme/parasiteImage/dam/parasites/helminths/cestodes/hymenolepis-nana.jpg/jcr:content/hymenolepis%20nana.jpg)
Hymenolepis nana, also known as the dwarf tapeworm, with adults measuring 15 to 40 mm in length.