A genus of jellyfish in the class Hydrozoa, known for its bell-shaped body and ocean-drifting lifestyle.
Named after Geryon from Greek mythology; the jellyfish's form supposedly reminded scientists of the mythical creature, or the name honored the mythological figure.
Scientists naming jellyfish after monsters is surprisingly common—it's a way to add drama to marine creatures that most people will never see, turning oceanic exploration into mythology.
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