noun
a taxonomic group of marine animals that includes sea stars and sea urchins
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Actinobranchia is a subclass of marine invertebrates that includes sea stars and sea urchins.
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I learned in biology class that actinobranchia are a type of sea creature found in the ocean.
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Check out those cool actinobranchia creatures at the aquarium!
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The actinobranchia of the business world are the innovative thinkers who drive progress.