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A reddish-orange nudibranch.
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A Baltic Sea Nudibranch

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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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Up close look at thin tentacles of a jellyfish.
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Jellyfish Tentacles Close Up

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Flame shells live in enormous colonies, but hidden in nests.
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Orange-Tentacled Flame Shell

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two brittle stars in a tank
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Brittle Star Splits

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The squidworm has 10 tentacle-like appendages on its head.
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The Squidworm - A New Species

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This giant squid washed up on a beach in Norway around 1950.
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Giant Squid on Beach

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Image of two white sea shells with spirals.
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Sanibel Island Shells: One Species at a Time

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This close-up view of salps, which have aggregated together into a long chain, have brilliant red guts from eating red plankton.
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Close-up View of Salps

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The blue lined octopus can be deadly, so it is best to stay away.
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The Dangerous Blue Octopus

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Photo collage of six species of invertebrates.
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Invertebrates from the Gulf of Mexico

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Riftia tubeworm (Riftia pachyptila) colonies near hot spring.
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Tubeworms on a Hydrothermal Vent

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