Thuridilla of some kind?

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Quero

Will be missed
Rest in Peace
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Location
Phuket, Thailand
# of dives
I just don't log dives
First, apologies for the poor quality of the photo.

This sea slug doesn't seem to have a visible gill, and since it looks like it's curled up on the sides, I'm thinking it might be some kind of thuridilla. But I can't find anything that looks like it in my books. Hoping one of you can help.

Location: Manado--Bethlehem (dive site)
Depth: less than 10 meters, in surge
Environment: volcanic+limestone sandy bottom with some algae, corals and sponges growing on debris; this spot had a lot of old cables lying around; daytime dive
Size: about 5 cms or less
 

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