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Jellyfish - Colobonema sp. 

Colobonema (Trachymedusae - Rhopalonematidae) is a genus of midwater jellyfish, with conical and transparent bell, up to 5 cm in diameter. With side lighting, birefringence of the bell muscles can create a beautiful array of colors. The bioluminescent tentacles (usually 32) readily break free from the bell when the jelly is disturbed, probably as a defense against predators.

Colobonema is a strong swimmer with relatively powerful pulsing of the bell. It  is holoplanktonic (lacks an attached polyps phase), with each fertilized egg developing directly into a medusa. It is among the more widespread and abundant of the deep-water Trachymedusae, with a depth range between 500 and 1500 meters.  The distribution range does not extend into Arctic and Antarctic waters.  

References: [1]

Photo credit: ©kqedquest (CC BY-NC 2.0) | Locality: Monterey Bay Aquarium, Monterey, California, United States (2005) 

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