GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Stinging hydrozoan (Gymmangium gracilicaule) on a coral reef. Hydrozoa are a type of cnidarian and are related to corals and sea anemones. This species is known for the painful sting it gives if touched. Photographed in Bali, Indonesia.
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