Pelagia noctiluca


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Distribution: 
Found globally in tropical and temperate waters.
Habitat: 
Generally considered to be oceanic, but may be washed near shore.
Size: 
60-90 mm bell diameter, as adults.
Diet: 
Gelatinous organisms, planktonic crustaceans, fish eggs and larvae.
Predators: 
Fish.
Useful Facts or Characters: 

8 tentacles and 4 long oral arms.  Color varies from purple to yellow.  Often have warts that contain stinging nematocysts on the bell surface.

Natural History: 

Common name is the mauve stinger.  Has a painful sting.  Known to form large blooms.  Caused massive damage to penned salmon at a fish farm in Ireland in 2007.  Has no benthic polyp stage.  Rarely seen in southern California.