What is "picornavirales"

The Picornavirales are an order of viruses with vertebrate, insect, and plant hosts. This group consists of viruses which have positive-sense single-stranded RNA genomes.

Five families within this group— Caliciviridae, Dicistroviridae, Picornaviridae, Potyviridae and Sequiviridae share a number of common features:

conserved RNA-dependent RNA polymerase genome has a protein attached to the 5' end no overlapping open reading frames within the genome all the RNAs are translated into a polyprotein before processing

The evolution of these viruses may have preceded the separation of eukaryotes into the extant crown groups.