The Feather Star - Antedon bifida – is found in most rocky areas around Britain but is more common on western coasts. It is quite variable in colour from red to brown and even yellow with occasional white bandings on the arms. It is found in crevices or clinging to other animals and plants which it does with a set of tiny claw-like feet. It projects its ten arms into the current where the act as a filter to trap suspended matter from the water on which the starfish feeds.
In the illustration the Feather Star is clinging to a group of sea squirts (or tunicates) called Ascidiella dispersa