Echinoderm
= Echinoderm
{wiki}
An <echinoderm> is a marine <animal> in the group containing sea stars, sea urchins and <sand dollars>. Adult organization commonly has five-part radial structure, whereas larvae can have <bilateral symmetry>. The skeleton consists of internal mineralized elements.https://ocean.si.edu/ocean-life/invertebrates/sea-stars-urchins-and-relatives[Smithsonian Ocean, symmetry and skeleton]{ref}