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Hydatina physis is a species of sea snail, a bubble snail, a marine opisthobranch gastropod mollusk in the family Aplustridae. Its common names include striped paper bubble, green-lined paper bubble, brown-lined paper bubble, and rose petal bubble shell. This was a large specimen. They have white margins on the mantle and the two tiny black dots are the eyes.
Usually found in sandy bottom or coral rubbles.