A possible phylogenetic relationship between members of this taxon is given by the Cryptosringid hypothesis.
A possible phylogenetic relationship between members of this taxon is given by the Cryptosringid hypothesis. A member of this phylum, Ophiocoma wendtii, is unique in that it is covered with ommatidia. Unlike most members of this phylum, ophiuroids lack an ampulla, a fleshy bulb used in movement. All members of this phylum have a filtering device known as a madreporite and tube feet, which are connected to form the water vascular system. For ten points, name this phylum of radial marine animals that includes sand dollars and starfish.
A possible phylogenetic relationship between members of this taxon is given by the Cryptosringid hypothesis.
{echinoderm}ata