The bacterium SAR324 is unusually cosmopolitan. In the ocean’s North Pacific Subtropical Gyre, microbes tend to stay localized at different depths. But SAR324 can be found throughout the water column, from the warm, well-lit surface, to the blue-lit twilight zone, to the continuous pressure of the dark abyss, 4000 m (2.5 miles) deep. Scientists have wondered, how can SAR324 exist in so many varied environments? Now, a recent study supported by the JGI has uncovered that SAR324 encompasses four subgroups, adapted to different oceanic depths and relying on different ways of living. Read more about the hidden diversity of SAR324 on the JGI website.