noun
a specialized region of the body in certain marine invertebrates, such as sea anemones and jellyfish, that contains the mouth and tentacles
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The actinosoma is the central disc of a sea star, from which the arms radiate.
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Did you know the actinosoma is the main body part of a sea star?
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Check out the actinosoma on that sea star, it's pretty cool.
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The actinosoma can be seen as the heart of the sea star, connecting all its arms together.