Cnidaria
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![Blue button](https://cdn.mos.cms.futurecdn.net/8WCKrKvVvLzSYmX9gMEn4g-320-80.jpg)
Rare, Blue Jellyfish-Like Creatures Wash Ashore in NJ, Puzzling Beachgoers
By Laura Geggel published
A weird, brilliant blue creature with feathery-like strands is washing ashore onto the beaches of New Jersey.
![Lion's mane jellyfish](https://cdn.mos.cms.futurecdn.net/f22tFDmiqSE7EhHTPCKTfN-320-80.jpg)
Family Finds Gooey 'Alien' Jellyfish on NZ Beach. And It Looks Like a Jell-O Mold.
By Kimberly Hickok published
The glob was an enormous lion's mane jellyfish.
![This gorgeous jellyfish, <i>Deepstaria enigmatica</i>, glides through the Pacific Ocean.](https://cdn.mos.cms.futurecdn.net/5qBQaaLVd4Q4FhePCLqdJm-320-80.jpg)
This Mysterious, Deep-Sea Jellyfish Looks Like the Ghost of an Alien
By Laura Geggel published
A remotely operated vehicle named Hercules filmed a rarely seen jellyfish that looks like a cross between an alien and a pinkish makeup bag.
![These images show Pseudooides, a fossil embryo smaller than a grain of sand. Long thought to represent the embryonic stage of an arthropod, this fossil is now revealed to be the first stage of development of an ancestor of today's jellyfish.](https://cdn.mos.cms.futurecdn.net/m5JAonjsUMBReXBjUZmspg-320-80.jpg)
Ancient Jellyfish Embryos Curled Up Like Accordions
By Stephanie Pappas published
A 537-million-year-old fossil was the victim of mistaken identity.
![Scientists spotted this huge jellyfish (<em>Chrysaora melanaster</em>) dragging a crustacean with one of its tentacles under the sea ice covering the Chukchi Sea off the north coast of Alaska.](https://cdn.mos.cms.futurecdn.net/LyZEDwNiuQoJ2c3QKXV6W8-320-80.jpg)
Rare Footage Captures Giant Jellyfish Living Under Arctic Ice
By Megan Gannon published
Surprisingly, adult jellyfish survive the winter under the Arctic's thick sea ice.
![<em>Cassiopea</em> jellyfish, known as upside-down jellyfish for their preferred position, appear to sleep at night.](https://cdn.mos.cms.futurecdn.net/YAnBvJHFuLyhxmrrNBiqQK-320-80.jpg)
Jellyfish Don't Have Brains, But They Do Sleep
By Stephanie Pappas published
Fun fact: Melatonin works on jellyfish.
![comb jellyfish](https://cdn.mos.cms.futurecdn.net/3sRFTqRBYc9kHRzsdSFELV-320-80.jpg)
First Animal? Jellyfish May Take the Prize
By Laura Geggel published
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.
![cosmic jellyfish](https://cdn.mos.cms.futurecdn.net/JKzM6jkUp72F2tLmLiLFQG-320-80.jpg)
Mysterious 'Cosmic' Jellyfish Spotted in Remote Ocean Depths
By Tia Ghose published
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.
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