ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Lion's mane jellyfish (Cyanea capillata). This is the largest known species of jellyfish. It 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. Photographed in the Sea of Japan.
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