unknown ciliate

[nanometer]

I expected to ID this quickly due to the distinctive mouth[?] and the large and very granular round structure. I found about 5 of these and they all looked the same. In addition to fine cilia at 10:00, there is another tuft of cilia at about 7:00-8:00 which didn't show due to my focusing on the mouth. But I didn't see cilia anywhere else around the periphery on any that I saw. I looked in various books for about an hour and gave up.

40x dic, major axis ~ 25 um.