The common name “sand dollar” refers to any species of urchin in the order clypeasteroida (greek for star-shaped shield). There are 4 suborders and 15 families of clypeastroida comprising 214 species.
Just a few more facts in addition to jepenna’s points above—Scientists are able to determine the age of a sand dollar by counting its growth rings on it exoskeleton, much like the way you would age a tree by counting the rings inside of it. Sand dollars are able to live six to ten years, and are preyed upon by California sheepheads, starry flounders, and pink sea stars. Sand dollars are related to sea urchins, sea stars, and sea cucumbers as members of phylum echinodermata.
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