Deep within the sea lies another world entirely. It’s a world of complete darkness, where light is absorbed thousands of feet below the ocean surface. The temperature remains constant at 39 degrees ...

Most polychaete species spend their lives in burrows in the seabed. However, adult individuals of two species, Alitta succinea and Platynereis dumerilii, leave their burrows to spawn during warm ...

A video capturing large numbers of brown and purple jellyfish swarming the sea area of Euboean Gulf has caused concern among ...

Watch one of the strangest creatures in the ocean — a jellyfish that can effectively reverse its own life cycle. Instead of dying after reaching adulthood, this animal can transform itself back into ...

Jellyfish are opportunistic predators but it seems they've added these typically seafloor dwelling worms to the menu.

During warm summer nights when the full moon rises, some species of polychaetes swim up from the seafloor to spawn. It’s a perilous journey, because hungry jellyfish are waiting in the water column.