@sylvia_ritter @yngmar Floor patterns... That's the surface of a black sponge---this little fella was on the Um El Faroud wreck (here in Malta) at about 30 metres depth. I think the little white bits are bryozoans, which the slug is feeding on. It was between 2 and 3 cm long. I only see P. faeroensis on this particular species of black sponge, but I think that's because I wouldn't be able to see them otherwise---they're so tiny!
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