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Today’s medusozoans include box jellyfish, hydroids, stalked jellyfish and ‘true’ jellyfish (Picture: Unsplash) The oldest-ever jellyfish fossil from more than half a billion years ago has been discovered. The free-swimming predatory jellyfish, named Burgessomedusa phasmiformis, was discovered from fossil records extracted from the Burgess Shale – a famous fossil-bearing deposit Continue Reading