<Li> family Taiwanasteridae Wang, 1984 </Li> <Li> family Scutellinidae Pomel, 1888a † </Li> <P> The term "sand dollar" derives from the appearance of the tests (skeletons) of dead individuals after being washed ashore . The test lacks its velvet - like skin of spines and has often been bleached white by sunlight . To beachcombers of the past, this suggested a large, silver coin, such as the old Spanish or American dollar (diameter 38 - 40mm). </P> <P> Other English names for the creatures include sand cake and cake urchin . In South Africa, they are known as pansy shells from their suggestion of a five - petaled garden flower . The Caribbean sand dollar or inflated sea biscuit, Clypeaster rosaceus, is thicker in height than most . </P>

Where did the name sand dollar come from
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