“…), the metagenomic era has multiplied the number of RNA viruses described by many thousands ( 10 – 13 ). This is evident in the field of “phycovirology” (the study of algal viruses), for which recent studies investigating RNA viruses using metagenomic approaches have revealed a high diversity and prevalence of RNA viruses in several microalgae lineages ( 11 , 14 – 21 ). While the positive-sense single-strand (ss+) picorna-like Marnaviridae are the best described family of microalgae-infecting viruses ( 11 , 22 , 23 ), metagenomic studies continue to expand the diversity of microalgal viruses, including identification of the double-strand RNA (dsRNA) viruses from the orders Ghabrivirales (Totiviridae-like), Durnavirales (Partitiviridae-like), and Martellivirales (Endornaviridae-like) ( 19 , 20 , 24 – 26 ), as well as ss+ RNA viruses from the Sobelivirales (Alvernaviridae), Nodamuvirales (Nodaviridae), Wolframvirales (Narnaviridae) , and Cryppavirales (Mitoviridae) phyla ( 19 , 20 , 24 , 27 , 28 ).…”