Starting with one nice shot, then chronological, from spotting in a hollowed rotten branch, through to the snail making its escape via mucus thread abseiling technique from my piece of A4.

Definitely one of the most stunning things I've photographed yet.

Size of shell approx 4mm

Native slug Cystopelta bicolor, Tarkine Bush Blitz, Tasmania, January 2015. These slugs only come out at night, when they clamber among vegetation and climb treetrunks. Normally blue-grey, those living in western rainforest areas have a delicate green hue instead.

This endemic species is said to inhabit undisturbed forests in Singapore. They have a preference to live within tree canopies and rarely come down,so we were really fortunate to see about 5 individuals all surrounding a single tree next to the road.They are known to be hermaphroditic, and possesses both male and female reproductive organs,but still need to find another snail to mate.
This species is currently listed as endangered on the Singapore Red Data Book due to several factors such as rapid urbanisation and over collection of their shells.

This beautiful snail was found about 1.5 meters up a small tree alongside a clear, cool stream coming out of an unlogged section of forested mountains.
I showed the pic to several local folks later. Some said they had seen similar snails, but others couldn't recall having ever seen one, so I believe it's not that common.
I think it could be an undescribed species. Please help me identify this guy if you are into gastropods.