class
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The organisms in the class Scyphozoa include most of the jellyfish of what most beach and ocean-goers view and think of today. They have radial symmetry and are diploblastic, meaning that their body wall consists of the outer epidermis and the inner endoderm, which are separated by mesoglea. Features include a simple nerve net with sensory cells; a gut cavity with one opening for food, waste, and sex gametes.
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