A genus of large jellyfish with long tentacles, including the lion's mane jellyfish, known for their blue coloring in some species.
From Greek kyanos meaning 'blue,' referring to the blue coloring of some species in this genus. Named in the early 1800s following scientific taxonomy conventions.
Cyanea jellyfish are absolute ocean giants—the lion's mane jellyfish in this genus can have tentacles longer than a blue whale is long, yet they're made of 95% water and their massive brain is just a nerve net with no actual central brain.
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