A lot of micro-lepidoptera have larvae that look like that, and live in a shelter constructed like that. Please can you rear it in captivity to get the adult moth for identification ?
donhe I am afraid I lost my cit-sci hat in the process of removing them all off my plants. The plant that I found it on is now completely defoliated, never to be resurrected I suspect. The second worst affected plant is hanging on with a few leaves left. Janet