Chloropicon sieburthiiChloropicon sieburthii is a species of marine chlorophyte algae, and is the type species of Chloropicon.DiscoveryChloropicon sieburthii was described in 2017, alongside a number of closely related Chloropicon species and Chloroparvula species. It was discovered in the equatorial Pacific Ocean at a depth of 120 meters. It was named in honor of John Sieburth for his work on electron microscopy of marine picoeukaryotes.DescriptionChloropicon sieburthii is unicellular, with a slightly irregular coccoid shape, a smooth cell surface, and a diameter ranging between 2–4 μm. Cells contain one mitochondria and one crescent-shaped chloroplast. No flagellum is present. Thylakoids have been seen alone or in stacks of three.EcologyChloropicon sieburthii has been recorded as a prey species of the Northern Pacific seastar.PhylogenyChloropicon sieburthii is believed to be most closely related to Chloropicon roscoffensis and Chloropicon primus based on similarities of their genomes, plastomes, and mitogenomes.