Limacodidae Caterpillar

Description:

Oval. Green. No discernible legs or mouth.

Habitat:

My neighbour's lemon plant. She brought it to me on a leaf (first shot) and I thought it was a pupa so I covered in with leaves taken from my lemon plant and kept it in a safe place. (Last time she got me a pupa and I asked her to put it back,ants got it.) Today I found it had moved to the fresher leaves while the one it was on had shrivelled. I mean to relocate it on my lemon plant and hope it lives to adulthood.

Notes:

Any idea what it is? Hairstreak butterfly??