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; phylum Cnidaria)
A class of marine, mainly pelagic medusoids (see medusa) which differ from the class Hydrozoa in possessing endodermal gastric tentacles, four-part radial symmetry, and gonads located in the gastric cavity. The polyp stage is reduced or absent.
From: Scyphozoa in A Dictionary of Zoology »
Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.
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