Heterodontus portusjacksoni egg
The Fossil Forum
The Fossil Forum
Port Jackson Shark occurs in southern Australian waters from southern Queensland south to Tasmania and west to the central coast of Western Australia and is oviparous.
The egg case of this species is a tough, dark brown spiral about 7 cm to 8 cm wide and 15 cm long.
The egg case is soft when laid by the female. She uses her mouth to wedge the egg case into a rock crevice where it hardens, and from which one young shark emerges after ten to twelve months. The Crested Horn Shark has a similar-looking egg case with the addition of long twisted tendrils on the bottom end. These are often attached to seaweed. Australian Museum.
The egg case of this species is a tough, dark brown spiral about 7 cm to 8 cm wide and 15 cm long.
The egg case is soft when laid by the female. She uses her mouth to wedge the egg case into a rock crevice where it hardens, and from which one young shark emerges after ten to twelve months. The Crested Horn Shark has a similar-looking egg case with the addition of long twisted tendrils on the bottom end. These are often attached to seaweed. Australian Museum.
A Port Jackson Shark with an egg case in its mouth. This photograph was taken on the sand line at a depth of 21 m, 'The Docks', Jervis Bay, New South Wales, July 2005.
Photo © Australian Museum
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