Echinoderm (Sand Dollar)
Echinoderms are a type of marine invertebrates. They inhabit "virtually every conceivable oceanic environment, from sandy beaches and coral reefs to the greatest depths of the sea". Their origins date back to an incredible amount of 500 million years! They are divided into five non-extinct subgroups: Crinoidea, Asteroidea, Ophiuroidea, Holothuroidea, and Echinoidea. Sand dollars are part of the subgroup Echinoidea, along with sea urchins.
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