id please

[Sabyasachi Patra]

Not sure what these are called. Will appreciate if any one can id these. Again these are frame grabs from my Canon Cinema C300 camera. Clicked at 1120mm.

Cheers,
Sabyasachi

[Abhishek Jamalabad]

Interesting. I'm guessing they are some kind of flatworm. Haven't seen these before. Was this in an estuarine mudflat habitat?

[Sabyasachi Patra]

Yes. This was in the mudflat shot of a mangrove ecosystem in the low tide time.