Ophiuroidea ("snake-tail form") contains forms known as brittle stars and basket
stars. They are called brittle stars because their arms (which are long and
slender) break off easily when seized by a predator, but are easily regenerated.
The animals are quite mobile, moving with a writhing, serpent-like motion in
search of prey and particulate matter that they collect with their arms and tube
feet. Although they have a sac-like stomach in the central disc, there is
no intestine or anus!
These brittle stars are resting on a coral colony, and the yellow organism
located in the lower left hand corner of the picture is a polychaete worm known
as a feather duster or Christmas tree worm!