|Mystery red goo in a thin layer of rainwater.|
|At x40, small round red structures are seen.|
|At x100, these show some faint internal structure.|
|Using the camera to zoom to about x250, this creature was seen, alive but contracted.|
There isn't space for a detailed look at rotifers here, but if you want to be able to identify British freshwater planktonic species (e.g. those found in ponds), then Pontin (1978) is a good starting point.
While some move with cilia, others, as here have a 'foot' like a mollusc and move using this, being able to contract and expand their body.
|Rotaria extended and curled. Various structures are visible - the head is blurred bottom-right - moving left, the paired jaws can be seen.|
|Rotaria extended, head towards the bottom.|
Pontin, R.M. (1978). A Key to the Freshwater Planktonic and Semi-planktonic Rotifera of the British Isles. FBA, Ambleside.