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Do jellyfish have a brain?

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The thing is, while jellyfish don’t have a brain or central nervous system, they do have a very basic set of nerves at the base of their tentacles. These nerves detect touch, temperature, salinity etc. and the jellyfish reflexively respond to these stimuli. read more

Jellies have been around for 650 million years—despite the lack of a brain or any blood. Lifestyle Natasha Umer • November 9, 2015 November 26, 2015 5835 Some people think jellyfish are jerks. read more

Box jellyfish of the class Cubozoa have elaborate eyes -- with actual retinas, corneas and lenses. These jellyfish do indeed react to visuals in their surroundings. Researchers aren't sure how exactly they analyze the things they see, however, due to their lack of brain, according to the Smithsonian Ocean Portal. read more

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