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How long have jellyfish lived in the ocean? This jellyfish fossil is from the...
Transparent sea jelly
Many jellyfish in the class Hydrozoa, such as this hydromedusa Aglantha digitale,...
Rudist clams are mollusks that went extinct about 65 million years ago. They were...
Arctic Sea Jelly
Chrysaora melanaster, one of the largest jellyfish commonly found in the Arctic,...