SimarterivirinaeSimarterivirinae is a subfamily of enveloped, Positive-strand [RNA virus|positive-strand RNA viruses] which infect vertebrate. The subfamily is in the family Arteriviridae and order Nidovirales. The subfamily contains six genera.StructureMember viruses are enveloped, spherical, and 45–60 nm in diameter.GenomeVariarteriviruses have a positive-sense single-stranded RNA genome.TaxonomyThe subfamily Simarterivirinae contains six genera:DeltaarterivirusEpsilonarterivirusEtaarterivirusIotaarterivirusThetaarterivirus''Zetaarterivirus''