Jeff Rotman / Close-up Port Jackson shark face (Heterodontus philippi) South Australia

Jeff Rotman / Nostrils and mouth parts of Port Jackson shark (Heterodontus philippi) at night, South Australia, Great Australian Bight

Jeff Rotman / Close-up of mouth of Port Jackson Shark (Heterodontus philippi) Eastern Australia, Indian Ocean.

Fred Bavendam / Port Jackson Shark (Heterodontus portusjacksoni) spiral egg case, New South Wales, Australia

Mike Parry / Port Jackson Shark (Heterodontus portusjackson), Jervis Bay, Australia. Digitally enhanced

Juergen Freund / Port Jackson shark (Heterodontus Philippi) amongst seaweed, Albany, Western Australia

Juergen Freund / Port Jackson shark (Heterodontus Philippi) swimming amongst seaweed, Albany, Western Australia

Doug Perrine / Port Jackson horn shark {Heterodontus philippi jacksoni} Australia, pacific

Brent Hedges / Juvenile Port Jackson shark {Heterodontus potusjacksoni}, Australia.

Pete Oxford / Port jackson shark, Galapagos. (Heterodontus philippi)

Mike Parry / Port Jackson Shark (Heterodontus portusjacksoni) portrait underwater, side view, Jervis Bay, New South Wales, Australia

Fred Bavendam / Port Jackson Shark (Heterodontus portusjacksoni), Jervis Bay, New South Wales, Australia

Fred Bavendam / Crested Bullhead Shark (Heterodontus galeatus) male chewing on freshly laid egg case of Port Jackson Shark (Heterodontus portusjacksoni), Jervis Bay, New South Wales, Australia

Norbert Wu / Zebra Horn Shark (Heterodontus zebra), South Pacific

Fred Bavendam / Port Jackson Shark (Heterodontus portusjacksoni) one swimming, New South Wales Australia

Fred Bavendam / Port Jackson Shark (Heterodontus portusjacksoni) pair, New South Wales, Australia

Jeff Rotman / Eye of Port Jackson shark {Heterodontus portjacksoni} South Australia Great Australian

Jeff Rotman / Eye of Port Jackson shark {Heterodontus portjacksoni} South Australia Great Australian

Jeff Rotman / Port Jackson Shark {Heterodontus philippi} South Australia