The common sand dollar, Echinarachnius parma, can be found in the Northern Hemisphere from the intertidal zone to the depths of the ocean, while the keyhole sand dollars (three species of …

May 7, 2024 · The sand dollar—AKA "sea biscuit" or "sand cake"—is purple and hairy in its prime. See nine things you didn't know about these fascinating creatures.

In its sandy seafloor habitat, a sand dollar uses its spines, aided by tiny hairs (cilia), to ferry food particles along its body to a central mouth on its bottom side. It captures plankton with spines …

Dec 12, 2025 · Sand dollars, also called cake urchins or sand cakes, are disk-shaped echinoderms that belong to the order Clypeasteroida under Echinoidea, a class comprising …

sand dollar, any of the invertebrate marine animals of the order Clypeastroida (class Echinoidea, phylum Echinodermata) that has a flat, disk-shaped body. They are close relatives of sea …

Mar 10, 2025 · Learn 7 interesting facts about sand dollars, like what’s inside them, how they move, how they reproduce, and why it’s bad to hurt them.

Nov 30, 2025 · Finding a perfect, unbroken sand dollar on the beach is often viewed as a sign of good fortune, representing abundance, prosperity, and a tranquil connection to the sea.

Do Sand Dollars Sting and Are Sand Dollars Dangerous? While sand dollars do have spines, they are soft and do not pose any threat to humans beyond some minor scrapes.

Oct 19, 2023 · Sand dollars are actually the skeletons of a particular type of sea urchin. Aside from the catchy name "sand dollar", these sea urchins are also known as pansy shells and sea …

Aug 9, 2022 · Sand dollars are small invertebrates that live near coastal areas throughout the global ocean. Their distinctive exoskeletons sport a star shape at the center of their disc-like …