Comb jelly, or ctenophore, (Beroe abyssicola) with parasitic amphipods. Comb jellies such as this 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. This B. abyssicola is a deep-sea species and often ingests bioluminescent prey, which would be visible through its transparent tissues. It has a red throat to prevent this light reaching the open water, which would attract the comb jelly's own predators. The small amphipod crustaceans are Hyperia galba. They swim amongst the plankton until they locate a host jellyfish or comb jelly, to which they attach with their sharp legs. They then burrow into their host and feed on their tissues. Filmed in the White Sea, Russia.