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Parasa lepida
It normally seen in Mango trees in winter in India. One should not make contact with this creature because the spines of Nettle Caterpillar release an irritant (a mixture of histamines) produced by a poison gland. The irritant causes the skin to burn and itch (uuff it's awful).. which is feel like got an "electric shock" so we use to call it an Electric Worm in our child hood.
Hello. I moved your fantastic caterpillar to the group Arthropods. It is also not a slug (a mollusk). Please see if you agree with the species suggestion.