One of the biggest mysteries of evolution is how species first developed complex vision. Jellyfish are helping scientists solve this puzzle, as the group has independently evolved eyes at least nine ...

If jellyfish need sleep to keep their nerve nets intact, the need to sleep probably predates the evolution of brains, eyes, and even bodies that are the same on both left and right sides. In ...

LAWRENCE — Some jellyfish have simple eyes; some have complex ones. Other jellyfish have no eyes at all. Indeed, recent research has shown jellyfish eyes in different species have evolved separately ...

They don’t have a brain or spinal cord. They float around in a way that often appears aimless. Though jellyfish lack a central nervous system, these gelatinous creatures again show that they might ...

The specimens are evidence of how little the squishy, tentacled predators have changed over the history of life on Earth. By Jack Tamisiea Jellyfish have been floating through Earth’s oceans seemingly ...