Parmarion martensi is a species of air-breathing land semislug, a terrestrial pulmonate gastropod mollusk in the family Ariophantidae. Wikipedia
The Yellow-shelled Semi-slug is rather variable in its body colour, though the shell is usually yellowish. It is a Singapore native species.
Spotted at Dairy Farm Nature Park
The photo show the slug descending on mucus threads.
Please check this document by Evgenij V. Shikov for the explanation of this. Thanks Law Jia Bao for mentioned about this document in the Nature Society Facebook Group
