Unknown Protist

[JimT]

ID help appreciated.

Saw several of these but difficult to get a good image because of its rapid movement. Measures ~170 UMs nose to tail. Has a “Motor mouth” like a rotifer when it parts its lips and seems to be living in an egg sac like membrane.

Image with the 20X obj.

[Francisco]

Very nice
Testudinella

[JimT]

Francisco, thank you. A new find for me.

[billporter1456]

Yep, Francisco nailed it, Testudinella rotifer for sure. They have a flattened, disc-shaped body and a couple of red eye-spots. For some reason, my little pond is full of them these days.