Deep-sea biodiversity (IMAGE) University of Cologne Caption The deep sea has an enormous diversity of species. Among the organisms, unicellular organisms such as bacterivorous and parasitic flagellates and ciliates dominate. Credit UoC / Hartmut Arndt Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.