Nudibranch? Good or bad?

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Today I found this little white slug on my glass and if you look closely you can see its antenna. Anyone know if this is a nudibranch or something else? And if it’s good or a pest?
 
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Today I found this little white slug on my glass and if you look closely you can see its antenna. Anyone know if this is a nudibranch or something else? And if it’s good or a pest?
Take a search on jorunna parva and see what you think. I see black speckles on the body, but could be from the glass.
 

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I agree that more white light pics of various angles (particularly of the top) would be helpful. That said, I’m pretty confident it’s not Jorunna parva, as it lacks the gill structure that would be the “tail” of the sea bunny (though I agree the spots in the pic definitely make it look similar).
 
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