Nautilus, Nautilus pompilius, Great Barrier Reef, Australia

nautilus nautiliden nautilida nautilidae lophotrochozoen nautiloiden nautilina argonauta living fossils evolution shell shells pearl pinhole olfaction mollusc mollusca cephalopoda nautiloidea macro closeup close up close up portrait oceania coral sea coralsea great barrier reef queensland underwater marine wildlife marine fauna nature aquatic sea ocean underwaterphoto underwaterpicture underwaterphotography underwaterworld sealife horizontal format nautilus nautilus pompilius great barrier reef australia