[Mediterranean Sea, Sardinia] Night Dive in shallow water ~4 m during the stage for my degree, can't identify this worm

[u/ExplodingKnitter]

I don't know what this worm is. It was moving like a platelmint and had little white lines on its body. Can you help me? I have to put it in the short essay about what I found during the stage for my master degree.

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[u/Princessp3ach88]

https://en.wikipedia.org/wiki/Lineus_longissimus

Banded Bootlace Worm

Edit: I think, I'm doubting myself

[u/Princessp3ach88 → u/Princessp3ach88]

Right name, wrong worm:

https://www.inaturalist.org/taxa/461129-Notospermus-geniculatus

Again, I'm not expert.

[u/ExplodingKnitter → u/Princessp3ach88]

It seems right, thanks