Cnidaria

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

Billions of by-the-wind sailors, also called Velella velella, could wash ashore in coming months because of favorable water temperatures and onshore winds.

If you're bored with all the vertebrates in your wildlife-cam media diet, the Monterey Bay Aquarium in California is now streaming mesmerizing live footage of its jellyfish.

The barrel jellyfish, isn't just the largest jelly found in the waters around the United Kingdom, it's also one of the animal kingdom's most strategic searchers, according to a new study.

For decades, flower hat jellyfish managed to keep their early lives a secret. But scientists finally watched the species grow in an aquarium.