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Mertensia comb jelly
Mertensia comb jelly (Mertensia ovum). Comb jellies are jellyfish-like organisms that take their common name from their rows of hair-like cilia, which they beat to propel them through the water. They are found in seas throughout the world but are not true jellyfish as they lack the characteristic stinging cells (cnidocytes). Photographed in the White Sea, Russia., by ALEXANDER SEMENOV/SCIENCE PHOTO LIBRARY
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