The<unk>  is a genus of a virus with no family. Virion capsids are non-enveloped, round and isometric, with a diameter of 25-33 nm.  The genome is a single piece of linear, positive-sense, single-stranded RNA, 4100-5700 nucleotides in length.  .
Species in this genus include:
Blueberry shoestring virus
Cocksfoot mottle virus
Lucerne transient streak virus
Rice yellow mottle virus 
Ryegrass mottle virus 
Sesbania mosaic virus 
Solanum nodiflorum mottle virus
Southern bean mosaic virus - Southern bean mosaic virus, the<unk> 's type species
Southern cowpea mosaic virus 
Sowbane mosaic virus
Subterranean clover mottle virus
Turnip rosette virus
Velvet tobacco mottle virus
Sobemovirus
Echovirus
Poliovirus
Erbovirus
Hordeivirus
Parechovirus
Human bocavirus
Idaeovirus