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Scientists Uncovered A 1,400-Year-Old Seagrass Clone, Zostera Marina (Eelgrass), In The Baltic Sea, Making It The World’s Oldest Known Marine Plant. Using A Genetic Clock Calibrated With A 17-Yr-Old Seagrass Clone, The Team Determined The Age By Comparing Genetic Variations. This Method May Reveal Older Organisms In Other Seagrass Species.

World’s Oldest Known Living Marine Plant Has Just Been Discovered At 1,400 Years Old | IFLScience

https://www.iflscience.com/worlds-oldest-known-living-marine-plant-has-just-been-discovered-at-1400-years-old-74662

A ground-breaking genetic clock was used to help make the discovery.