Humans aren't the only species that like to swim in warm, near-shore waters. Jellyfish are back at the Delaware beaches, ready to ruin a good dip with their stinging tentacles. Sea and bay nettles and ...

Jellyfish belong to medusozoans, or animals producing medusae, and include today's box jellies, hydroids, stalked jellyfish and true jellyfish. Medusozoans are part of one of the oldest groups of ...

The Royal Ontario Museum (ROM) announces the oldest swimming jellyfish in the fossil record with the newly named Burgessomedusa phasmiformis. These findings are announced in the journal Proceedings of ...

They don’t have a brain, and yet they’re able to survive—to thrive—generation after generation.” Flower hat jellies exemplify ...

A box jellyfish recently pulled from the waters around a island once called the Island of Death carries a sting that can stop a human heart, and researchers are only beginning to understand what ...

While scuba diving off the south-west coast of England this summer, I was lucky to encounter several different species of jellyfish in just a matter of weeks. Many of these, including the compass ...