It is also featured in the photo. The arms form a fan like structure, which maximises the filtration area. Most basket starts feed by filtering food particles, their food is either caught by hooks or on mucus nets spun between the arms. Astrosierra amblyconus s main food is planktonic crustaceans. The mechanical properties of this tissue can be modified to allow the animal to be either extremely flexible or conversely quite rigid.
Echinoderms also have amazing powers of regeneration.
I could not find much information on Basket stars. A new one will be ordered in next time. Keep your eyes open for it as it had heaps of information on local common species.