A clutch of tiny black eggs, discovered by a remotely operated vehicle in the abyss of the Pacific Ocean, is the first concrete evidence that deep-sea flatworms exist more than 6,000 meters (3.7 ...

Tiny marine flatworms called acoels hunt for prey in coral reefs. They’re referred to as “plant-animals” because they’ve got a partnership with photosynthetic algae that live inside of them. But this ...

Paracatenula is a marine flatworm that inhabits the sediments of warm regions. It can be found all around the globe in sheltered sandy habitats, for example in seagrass meadows, coral reefs or ...

No brain, but still a master of the ocean floor. Sea stars have a nerve ring and radial symmetry that allows them to move and ...