The sponge and starfish were found a mile deep into the sea and 200 miles off the Atlantic coast as part of a regular Okeanos Explorer trip to document an area of the ocean near New England.

Sea slugs are one of the world’s most stunning, diverse, and adaptable animals. Not only are sea slugs beautiful to look at, ...

The mysterious disease causing sea stars to waste away isn’t just a disaster for the aquatic invertebrates. It may end up making climate change worse, too.

But starfish—as well as sand dollars and sea anemones—have radial symmetry, with identical segments of their body radiating out from a central point.

According to a study, this technique is quite challenging because hunting while carrying a sponge on the face interferes with ...

Ecologist Alex Romer tugged his snorkel on and slipped into the stillness of Palm Beach County’s Lake Worth Lagoon, an ...

A reef of glass sponges, creating a deep-sea oasis 650 feet below the surface, was discovered for the first time in U.S. waters off the Washington coast.

Scientists estimate that more than 5 billion sunflower sea stars, once a mighty predator, have died in the Pacific Ocean because of warming waters.

These Ancient Sea Animal Fossils Aren't What They Seem, Scientists Say At various times, researchers have thought them to be from jellyfish or sea sponges.