Creature ID

[Marineman]

I notice this creature moving under the LR at night, it has the shape of an actinodiscus=discosoma mushroom except that it is moving like a stingray! The colour is grey/blue an about 2.5" in diameter, can anyone tell me what this is? Quite scary looking.

[Marineman]

another pic

[Terryz_]

Looks like flatworm... But not very sure...

[Marineman]

more pic

[Travy]

I notice this creature moving under the LR at night, it has the shape of an actinodiscus=discosoma mushroom except that it is moving like a stingray! The colour is grey/blue an about 2.5" in diameter, can anyone tell me what this is? Quite scary looking.

It moves?!

Then my best guess would be some form of sea slug....

Worst case, flatworm...

[blueheaven]

Can't be a nudi

Most likely a flatworm

[Marineman]

Thanks guys, looks like a flatworm, did some research in the net, did not find a similar picture. I guess it is most likely a flatworm. It is flat and I saw it the first time when the lights are out, looks like a mushroom, flat with a mouth in the center and glides like a stingray below the rocks but have not seen it swim, greyish blue in colour.

[Guinness]

seems awfully big for a flatworm....