These soft, floppy echinoderms don't seem like they're related to starfish at all... but they are! They're an unusual group that have lost their star-shaped pattern and have their mouth at one end and ...

and the juvenile settles to the sea floor. The planktonic larva is morphologically complex and the various taxonomic groups all have their own distinctive larval forms. All echinoderms have tube-feet ...

Keywords echinoderms, sea stars, sea urchins, sand dollars, radial symmetry, spiny skin, water vascular system, locomotion, feeding habits, regeneration, reproduction, scientific research Email us ...