Starfish also have receptors throughout their skin that sense pressure, temperature and pain much as ours do. Their skin has chemoreceptors, which give them the extremely well-developed sense of smell they use to hunt prey and avoid predators. read more
No starfish do not feel pain. THey technically have no brain. THey have a "nerve net" which is the primitive form of a nervous system. The nerve net just lets them know where their limbs are. If one is missing then the starfish will start to regenerate a new one. read more