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underwater photography sea slug nudibranch marine life underwater colorful invert ocean wildlife marine biology invertebrate mollusk gastropod aeolidiidae nemertea ribbon worm nemertean nemerteans marine invertebrates benthic soft-bodied unsegmented bilaterally symmetrical triploblastic coelomate protostome lophophore ciliated mucus secretion sticky predatory carnivorous scavenger filter feeder suspension feeder detritivore omnivore herbivore close up scuba diving snorkeling sea water nature biology underwater macro macro photography