Zayed et al. (April 7, 2022) in Science “Cryptic and abundant marine viruses at the evolutionary origins of Earth’s RNA virome” report several major hitherto-unknown Ribovirial phyla:
The two most sampled, Taraviricota and Arctiviricota, had the lowest normalized abundances.
To mitigate issues of subjectivity, their RdRp-based phylogenetic analysis was developed to recapitulate the established ICTV-accepted taxonomy (97% agreement). Their new tree shows a very different early evolutionary history, for example splitting Duplornaviricota into 3 distant phyla:
Are these findings robust? The unknown megataxa and the revision of Orthornavirae?