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I think it’s Stiliger?

About 12 mm long. Seen on hydroids in a tide pool.

Hypselodoris sp. 12 in NSSI 2

About 5mm long, found on Pennaria disticha hydroids.
Appears to be an undescribed species as far as I can tell, but I would be happy to be corrected if this already has a name!

Tenellia sp.