A hydromedusa spreads its luminescent tentacles in the Weddell Sea near Antarctica.
南
附近
威德尔海域，一
水螅水母伸展着它发
角。
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In addition to their characteristics, in these cnidarians, there's the leap of the formation of a third layer of tissue during development, from the polyp state to certain jellyfish, such as some that belong to the taxon of hydromedusae.
除了它们的特征，在这些
物之间，在发育过
中，还有第三层组
的飞跃，从息肉状态到某些水母，比如一些属于水螅纲的水母。
