The term "sand dollar" is the name given to a unique species of flat, burrowing sea urchins. Sand Dollars, also known as a "sea cookies" "snapper biscuits," or "pansy shells," belong to the order Clypeasteroida.
A relative of the sea urchin, starfish, and sea cucumber, the sand dollar has a rigid skeleton known as a "test." While alive, the sand dollar's test is covered in a velvety layer of skin and cilia that gives it its signature sand-papery texture.
