Pisoniviricetes  Pisoniviricetes is a class of RNA viruses which infect eukaryotes. Member viruses have a positive-sense single-stranded RNA genome. The name of the group is a portmanteau of member orders ""pi"cornavirales, "so"belivirales, "ni"dovirales" and -"viricetes" which is the suffix for a virus class. The following orders are recognized: