ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Comb jelly, or ctenophore, (Beroe cucumis) with beating cilia. Comb jellies typically have eight rows of cilia, which they beat for propulsion. The cilia do not emit light themselves, and the rainbow effect is produced by the diffraction of the illuminating light. Comb jellies are found in marine environments worldwide, where they feed on plankton and small animals such as copepods. Many have tentacles to catch prey, in a similar manner to jellyfish, but Beroe sp. ctenophores simply engulf their prey with their large mouth. This specimen is around 5 centimetres in length. Filmed in the White Sea, Russia.
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