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Sea Gooseberry Video Stock Footage

Pleurobrachia pileus is a small, globular or ovoid comb jelly up to about 2.5 cm (1 in) in length. It has a pair of long tentacles that are used to catch prey and can be retracted into sheaths. The tentacles are up to twenty times the length of the body and are fringed with filaments along one edge. The body bears four pairs of longitudinal rows of cilia known as combs which extend about three quarters the length of the animal between its mouth and its aboral (opposite) end. The cilia are mounted on short transverse plates which are bioluminescent. It is the beating of the cilia in synchrony that allows the animal to swim and that gives it an iridescent appearance. The body is transparent and the comb rows milky white. The tentacles, sheaths and pharynx are also milky white, or dull orange in some individuals. In the North Sea, P. pileus makes large daily vertical migrations as do its main copepod prey. They spend the night in upper waters, usually just below the thermocline, descending to deep waters between 80 and 150 metres (260 and 490 ft) in the early morning, and rising again in late afternoon. These migrations do not take place in the winter and at this period, P. pileus remains close to the sediment, often with a cessation of movement of the combs of cilia. This change in behaviour may be due to the scarcity of prey in the water column at this time of year. When on or near the sediment, this comb jelly is preyed upon by crustaceans such as the he...

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Animalia: Ctenophora: Cydippida: Tentaculata: Pleurobrachiidae: Pleurobrachia pileus

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