胎儿三毛滴虫 (Tritrichomonas foetus) 与牛精子
Photomicrograph showing Tritrichomonas foetus with a bovine spermatozoon. Note the organism's three characteristic anterior flagella (yellow arrow), the trailing flagellum (red arrow), and the undulating membrane (blue arrow). For scale, the spermatozoon head is approximately 5 mcm wide.
Courtesy of the Drost Project and the Visual Guides of Animal Reproduction (visgar.vetmed.ufl.edu).
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