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Small orange brittlestars on the coast of the Atlantic.
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An Invasive Brittlestar

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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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This small sea star, little more than an inch across, is orange on top and whitish underneath.
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Little Sea Star

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Nine small invertebrates held on two fingers.
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A Handful of Biodiversity

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Illustration of the Paleozoic shallow water habitat.
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A Mississippian Marine Habitat (359 - 318 Million Years Ago)

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A zoomed-in image of the crown-of-thorns sea star.
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Acanthaster planci

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A brachiopod looks like a clam, but they aren't closely related.
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A Modern Day Brachiopod

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