Cnidaria

The glob was an enormous lion's mane jellyfish.

A remotely operated vehicle named Hercules filmed a rarely seen jellyfish that looks like a cross between an alien and a pinkish makeup bag.

A 537-million-year-old fossil was the victim of mistaken identity.

Surprisingly, adult jellyfish survive the winter under the Arctic's thick sea ice.

Fun fact: Melatonin works on jellyfish.

If scientists were to draw an enormous family tree for all of Earth's animals, the oldest branch would belong to the jellyfish, a new study finds.

A glowing, ethereal jellyfish was spotted about 10,000 feet below the water's surface in a remote stretch of the Pacific Ocean near American Samoa.

A dime-sized jellyfish that can deliver severely painful stings has been detected in New Jersey waters for the first time.