ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Lion's mane jellyfish. Close-up of tentacles of a lion's mane jellyfish (Cyanea capillata). These are the largest known species of jellyfish. They can reach over 2 metres across with tentacles of around 30 metres long, containing millions of nematocysts (stinging cells). They range from Arctic waters to the coasts of Florida, USA, and Mexico.
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