Very nice photos of 'living' specimens!
I still very much enjoy chasing these little blighters around in a simple water mount.
Hopefully I'll have a litle more time again for this particular hobby...
> An image by Charles S. of Cymatopleura solea encouraged me to hunt for some in a pond here and I've uploaded a composite. From the same muddy area came what looks like Surirella robusta and a Stephanodiscus with the organic threads Round (1990) mentioned in their genus description.