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Virus classification
Group: Group IV ((+)ssRNA)
Order: Tymovirales
Family: Tymoviridae

Tymoviridae are monopartite single-stranded positive sense RNA plant viruses, belonging to group IV of the Baltimore classification of viruses. The Tymoviridae are a relatively new family, only approved in 2002.


The virons are non-enveloped and isometric with a diameter of around 30 nm, with an icosahedral structure and a triangulation number (T) = 3.

The linear genome is between of 6-7.5 kilobases in length and encodes one large open reading frame. It is capped at the 5’ terminus. The 3’ terminus may have a tRNA-like structure or a polyA tract, depending upon the species. The genome is relatively cytosine rich.


The largest of three genera is Tymovirus with 25 species, whereas the other genera, Marafivirus and Maculavirus have 5 and 1 species respectively.

The Tymoviridae family includes the following genera:

Unclassified viruses


  1. ^ Wang L, Lv X, Zhai Y, Fu S, Wang D, Rayner S, Tang Q, Liang G (2012) Genomic characterization of a novel virus of the family tymoviridae isolated from mosquitoes. PLoS One 7(7):e39845.

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