A beautiful bubble shell nudibranch (Hydatina physis), Anilao, Philippines.

acteonoidea anilao animal animal themes animals in the wild aplustridae aquatic biology bubble snail close up color image extreme close up gastropod horizontal hydatina hydatina physis invertebrate macro marine biology mollusk nature no people nudibranch one animal opisthobranch outdoors philippines photography sea life sea slugs sea snails southeast asia species undersea underwater wildlife zoology