Gary Bell/ Oceanwide / Port Jackson Shark (Heterodontus portusjacksoni), Australia

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

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)