旋核六鞭毛虫 (Spironucleus vortens)，神仙鱼
Photomicrograph of Spironucleus vortens, a diplomonad flagellate from the intestine of a freshwater angelfish. It has six anterior flagellae and two posterior flagellae, although all cannot be seen in this image. Unstained wet mount; original magnification, 1,000×.
Courtesy of Dr. Sarah Poynton.
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