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= Atolla = From Wikipedia, the free encyclopedia

Anatomy
Atolla jellyfish posses a red color, a crown-looking groove on their bells, and around 20 tentacles. Similar to most jellyfish, the Atolla species does not possess a brain, nervous system, circulatory system, central nervous system, and respiratory system and is an invertebrate.

Diet
Atolla jellyfish are known for eating crustaceans and other forms of organic matter. One of their 20 tentacles is longer than the rest and is used to lure prey more easily.

Habitat
Atolla jellyfish live in darker areas, about 300-4900 meters (1000-16000 feet) below the surface. Some of them live in the mesopelagic zone, commonly referred to as the twilight zone. Very little light is able to reach these depths of the ocean, which is why many bioluminescent creatures can be found there. Others inhabit the bathypelagic zone, which can be found 1000 to 4000 meters below the surface (3280-13123 feet).

Behavior
Atolla jellyfish use their bioluminescent abilities as a defense mechanism. If threatened, the atolla jellyfish will flash blue light. Many scientists believe that the jellyfish is trying to lure in predators to fight or eat the predator that threatens the jellyfish itself. This activity has gained them the nickname "alarm jellyfish". Their natural red color allows them to blend into their habitat, where little light reaches.