Juergen Freund / Chambered nautilus (Nautilus pompilius) with radio transmitter, Indo-pacific

Juergen Freund / Portrait of Chambered Nautilus {Nautilus pompilius} Underwater, Papua New Guinea

Juergen Freund / X-ray of the shell of the Pearly / Chambered nautilus {Nautilus pompilius} showing the internal chambers of the shell.

Juergen Freund / Two Pearly nautilus {Nautilus pompilius} Sulu-sulawesi seas, Indo-pacific. Fills shell with water to sink and expells water to rise, lateral movement by jet propulsion

Juergen Freund / Nautilus shells (Nautilus pompilius) collected and sold for the decorative market, Indonesia, July 2008.

Juergen Freund / Nautilus shells (Nautilus pompilius) collected and sold for the decorative market, Indonesia, July 2008.

Juergen Freund / Nautilus shells (Nautilus pompilius) collected and sold for the decorative market, Indonesia, July 2008.

Juergen Freund / Guests help out 'Undersea Explorer' marine biologist Qamar to engrave, photograph and measure caught Nautilus for research, Queensland, Australia, 2007

Juergen Freund / Guests help out 'Undersea Explorer' marine biologist Qamar to engrave, photograph and measure caught Nautilus for research, Queensland, Australia, 2007

Juergen Freund / Shell of a caught Chambered nautilus {Nautilus pompilius} being engraved with a number for research onboard the 'Undersea Explorer', Queensland, Australia, 2007

Juergen Freund / Researcher Jaap on board research boat 'Undersea Explorer' bringing up two caught Chambered nautilus {Nautilus pompilius} Queensland, Australia, 2007

Juergen Freund / Andy Dunstan diving with Chambered nautilus (Nautilus pompilius} Queensland, Australia

Juergen Freund / Andy Dunstan and Dr. Peter Ward observing caught Chambered nautilus {Nautilus pompilius} Queensland, Australia, 2007

Juergen Freund / Nautilus scientific team observing Chambered nautilus {Nautilus pompilius} fitted with radio transmitter, underwater, Indo-pacific, 2007

Juergen Freund / Chambered nautilus {Nautilus pompilius} showing mantle, syphon and tentacles, Indo-pacific

Juergen Freund / Chambered nautilus {Nautilus pompilius} showing mantle, syphon and tentacles, Indo-pacific

Juergen Freund / Chambered nautilus {Nautilus pompilius} showing mantle, syphon and tentacles, Indo-pacific

Juergen Freund / Chambered nautilus {Nautilus pompilius} Indo-pacific

Juergen Freund / Chambered nautilus {Nautilus pompilius} on coral reef, Coral Sea, Queensland, Australia

Juergen Freund / Chambered nautilus {Nautilus pompilius} against red fan coral, Coral Sea, Queensland, Australia

Juergen Freund / Chambered nautilus {Nautilus pompilius} Indo-pacific

Juergen Freund / Chambered nautilus {Nautilus pompilius} Indo-pacific

Juergen Freund / Dr. Peter Ward observing Chambered nautilus {Nautilus pompilius} specimen with attached radio transmitter, onboard the 'Undersea Explorer' research boat, Queensland, Australia, 2007

Juergen Freund / Captured Nautilus {Nautilus pompilius} in cooler box. One Nautilus with temporarily attached radio transmitter, Queensland, Australia, 2007

Graham Eaton / Shell of Chambered nautilus (Nautilus pompilius) cut in half to show chambers and syphon tube

Juergen Freund / Photograph and X-ray of shell of the Chambered / Pearly nautilus {Nautilus pompilius}

Juergen Freund / Diver with two Pearly / Chambered nautilus {Nautilus pompilius} Great Barrier Reef, Coral Sea, Australia

Juergen Freund / Close up of mouthparts of Chambered Nautilus {Nautilus pompilius} Underwater, Papua New Guinea

Juergen Freund / Shell of the Pearly / Chambered nautilus {Nautilus pompilius}

Doug Perrine / Chambered / Pearly nautilus {Nautilus pompilius} Indo-pacifi

Juergen Freund / Chambered / Pearly nautilus {Nautilus pompilius} against fan coral, Australia.

Juergen Freund / Chambered / Pearly nautilus pair {Nautilus pompilius} Australia.

Jane Burton / Chambered / Pearly Nautilus (Nautilus pompilius) shells. Indo-Pacific.

Juergen Freund / Pearly / Chambered nautilus caught in trap {Nautilus pompilius} Indo Pacific

Doug Perrine / Pearly chambered nautilus {Nautilus pompilius} Celebes Sea (Non-ex).

Juergen Freund / Pearly nautilus swimming, Indian Ocean

Juergen Freund / Diver with pair of Pearly nautilus {Nautilus pompilius} Great Barrier Reef, Queensland, Australia

Juergen Freund / Pearly nautilus swimming {Nautilus pompilius} Indo-Pacific

Juergen Freund / Close up of siphon of Pearly nautilus {Nautilus pompilius} Sulu-sulawesi seas. Used to fill shell with water to sink and expell water to rise, lateral movement by jet propulsion

Juergen Freund / Pearly nautilus {Nautilus pompilius} swimming, Indian Ocean

Juergen Freund / Pearly nautilus (Chambered) {Nautilius pompilus} Indo-pacifi

Juergen Freund / Pearly (Chambered) nautilus shell on beach {Nautilus pompilius} Philippines