Divers often come across weird, unexpected things. It’s not always a good idea to investigate up close. But when John Roney saw a tentacle just above him, he had to see what was happening. “Several ...

Jellyfish Day honors one of Earth’s oldest and most fascinating creatures, glowing reminders of resilience beneath the waves.

A Japanese teenager discovers a new species of jellyfish in a bay, Orchistoma integrale, extending the habitat of this genus.

The Portuguese man-of-war, or Physalia, is a jelly-like creature that uses a special gas-filled balloon to float on the sea surface. Physalia inhabits the area where the ocean meets the atmosphere, in ...

Here are the U.S. beaches with the most jellyfish stings, plus which species are common, and expert tips on how to avoid and ...

Chinese researchers have unveiled a new biomimetic underwater robot designed to operate almost invisibly beneath the surface.

A student-led research group from Tohoku University has discovered a new species of the venomous Physalia (commonly known as Portuguese man-of-war) that has never been seen before in northeast Japan.

A new venomous species, _Physalia mikazuki_, has been discovered by Tohoku University students off Japan's coast. This discovery highlights the impact of climate change on marine biodiversity.