ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Lion's mane jellyfish (Cyanea capillata). Lion's mane jellyfish 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. This specimen was photographed in the White Sea on the northwest coast of Russia.
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