Nudibranch - Dermatobranchus sp

This is a small Nudibranch from the genus Dermatobranchus. Various species under this genus could look very similar hence, it is hardly possible to be certain on the species ID just by picture, and partly also, some of them could yet to be described species.

This Nudibranch was seen crawling on a Feather Duster worm, which is a surprise as the Worm will usually retracts when you get near it, which also means, the Nudibranch is so light and delicate, that it does not affects the Feather Duster Worm at all.