Prasinovirus is a genus of large double-stranded DNA viruses, in the family Phycodnaviridae that infect phytoplankton in the Prasinophyceae. There are three groups in this genus,[1][2] including Micromonas pusilla virus SP1, which infects the cosmopolitan photosynthetic flagellate Micromonas pusilla.[3]
There is a large group of genetically diverse but related viruses that show considerable evidence of lateral gene transfer.[4][5]