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

The Tymovirales are a newly established order of viruses in the 2009 classification with four families. This group consists of viruses which have (+) sense single stranded RNA genomes without DNA intermediates. Their genetic material is protected by a special coat protein.


The Tymovirales are mainly plant pathogens first described in 2004.[1] They are characterised by similarities in their replication-associated polyproteins. These account for the majority of their genomic coding capacity. They are considered to form a group, phylogenetically, referred to as flexiviruses, with filamentous virions.[2]

Additional species

A new virus - Sclerotinia sclerotiorum deltaflexivirus 1 - has been described that appears to belong to a new genus in this family.[3] The name Deltaflexiviridae has been proposed for this genus.

Another virus - Fusarium graminearum deltaflexivirus 1 - has been described.[4]


  1. Adams MJ, Antinow JF, Bar-Joseph M, Brunt AA, Candresse T, Foster GD, Martelli GP, Milne RG, Fauquet CM (2004) The new plant family Flexiviridae and assessment of molecular criteria for species demarcation. Arch Virol 149:1045– 1060
  2. King 2012.
  3. Li K, Zheng D, Cheng J, Chen T, Fu Y, Jiang D, Xie J (2015) Characterization of a novel Sclerotinia sclerotiorum RNA virus as the prototype of a new proposed family within the order Tymovirales. Virus Res pii: S0168-1702(15)30127-1. doi: 10.1016/j.virusres.2015.11.019
  4. Chen X, He H, Yang X, Zeng H, Qiu D, Guo L (2016) The complete genome sequence of a novel Fusarium graminearum RNA virus in a new proposed family within the order Tymovirales. Arch Virol


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