A ciliate thats similar to so many others.

[waterman]

I realise that this is a very common ciliate form, however I'm having trouble nailing it down to anything specific. it's medium sized and appears fairly regularly in my garden pond. Has anybody out there seen any of these?

All ideas gratefully received.

Thanks in advance.

IMG_2249b by [url=https://www.flickr.com/photos/144618088@N07/}, on Flickr