Campbell’s Helicarionid Land Snail



Advena campbellii


  • Habitat loss
  • Direct predation caused by rats and poultry animals
  • Uncontrolled weed growth

The Norfolk and Phillip Islands used to be the roaming grounds for the Campbell’s Helicarionid Land Snail. It is characterised by having a black round base and an elevated fawn spire. It usually grows up to 11 mm in height and 17 mm in diameter.

Top threats to the survival of the population of the Campbell’s Helicarionid Land Snail include habitat degradation and modification. This comes as a result of exotic weed growth, grazing livestock, and introduction of flora and fauna which can also reduce moisture and increase the risk of fire.

With more than 200 new vascular plants brought on Norfolk Island, weed management becomes uncontrollable. This is worsened by the construction of a storm water drain from Mount Pitt which caused topsoil erosion and encouraged weed growth.

Introduction of the Polynesian Rat species to the surrounding area also led to the decline in number of the Campbell’s Helicarionid Land Snail. Falling prey to feral animals and other invasive species is also presumed to reduce population numbers quickly.

Land conversion to human settlements also lessens the potentiality for population growth and recovery of the Campbell’s Helicarionid Land Snail.