Australian land snails are almost always dextral i.e. they have a right hand opening. A few rare species are sinistral [left hand opening]
Common form with right hand opening:
Eastern Trumpetsnail
Gyliotrachela australis
Rarer left hand opening:
Border Ranges Staircase-snail
Velepalaina strangei
Ivory Treesnail (Noctepuna cerea)
Land snails are important environmental indicators and biodiversity predictors and have a role to play in the monitoring of climate change. Their conservation should be a HIGH priority.
Invertebrates make up about 99% of terrestrial biodiversity on our planet. Molluscs are the third most common group after Insects and Fungi. Snails and slugs represent 6% of the world’s terrestrial fauna.
AUSTRALIAN LAND SNAILS:
Australia has about 3000 species of land snails ranging from tiny snails measuring about 1mm to the largest land snail, the Giant Panda Snail, Hedleyella falconeri.
Facts About Snails 