Nautilus, Nautilus pompilius, Great Barrier Reef, Australia

aquatic argonauta australia cephalopoda coral sea coralsea great barrier reef lophotrochozoen marine fauna marine invertebrates marine wildlife mollusc mollusca nature nautilida nautilidae nautiliden nautilina nautiloidea nautiloiden nautilus nautilus pompilius ocean oceania pearl queensland sea sealife shell shells underwater underwaterphoto couple evolution living fossils olfaction pair pinhole two underwaterphotography underwaterpicture underwaterworld